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201 | IGR J16316-4028 a possible X-ray counterpart to 3EG J1631-4033 discovered by INTEGRAL | Jerome Rodriguez (CEA Saclay & ISDC) & Andrea Goldwurm (CEA Saclay) | We report the detection of a source, IGR J16316-4028, at RA=16h31.6m Dec=-40°28' (+-3 arcmin) with the IBIS/ISGRI telescope on board INTEGRAL. The source was detected during a ToO observation of the Galactic black hole candidate XTE J1720-318 performed on Feb. 28 2003. The source is detected at the 9 sigma level in the 20-40 keV range during a ~20 ks mosaic, with an average flux of ~25 mCrab. It is also detected between 40 and 80 keV, during the same time, with an average flux of ~19 mCrab. IGR J16316-4028 shows some variations on ~2000s time scales from just below the detection threshold (~20 mCrab) up to a flux of 45 mCrab in one occasion (4.5 sigma in ~2000s), in the 20-40 keV energy range.
IGR J16316-4028 lies at ~10 arcmin from the EGRET source 3EG 1631-4033, well within the 95% EGRET error box. This renders likely the identification of IGR J16316-4028 as the (hard) X-ray counterpart to 3EG J1631-4033. The ISGRI 20-40 keV (15*9 degrees) image is available (here). The closest known X-ray source, 1RXS J163336.7-404609, lies at 29 arcmin from the INTEGRAL position, which thus renders the identification of IGR J16316-4028 with 1RXS J163336.7-404609 very unlikely.
Observations at other wavelengths are strongly encouraged to better understand the nature of this (possible) EGRET source. | 2003-10-24 16:12:00 | x-ray,gamma ray,agn,black hole,neutron star,pulsar,quasar,star | 2003-10-24 | 16:12:00 | 1,308 | [
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202 | Be star counterpart of X-ray pulsar MX0656-072 | Manfred W. Pakull (Strasbourg), Christian Motch (Strasbourg) and Ignacio Negueruela (Alicante) | The field of the pulsating transient X-ray source MX0656-072 (ATEL #197,#199) has been observed with the ROSAT PSPC in 1993 September to reveal only a close pair of sources just outside the 3' error region. One, RX J065815.0-071237, coincides with the star GSC2.2 S100221215. An optical spectrum reveals an early-K star with strong emission reversals in the CaII H and K lines, i.e., an active chromosphere.
The position of the other ROSAT source, RX J065817.7-071228, is consistent with the previously proposed counterpart, a variable reddened Be star (V=12.05-12.38, B-V=1.02-0.86; Pakull 1978, The (ESO) Messenger 13, 17). The star is also H(alpha) emission line star No. 33 in the catalogue of MacConnell (1981 A&AS 44, 387), it carries GSC2.2 designation S100221212 and is located at (2000) 06:58:17.30, -07:12:35.3.
Repeated observations reveal a O9.7Ve spectral type displaying extremely narrow (unresolved at a resolution of 50 km/s) emission lines of HI, HeI and low-ionization metals. Their strengths has strongly increased over the last few years. These findings suggest a Be X-ray binary nature of MX0656-072. | 2003-10-24 20:29:00 | optical,x-ray,binary,neutron star,pulsar,star,transient,variables | 2003-10-24 | 20:29:00 | 1,123 | [
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203 | The likely IR counterpart to the Anomalous X-ray Pulsar XTE J1810-197 | GianLuca Israel, Nanda Rea, Vincenzo Testa, Vanessa Mangano (INAF Roma), Nancy Ageorges, Wolfgang Hummel, Gaspare Lo Curto, Olivier Marco, Roberto Mignani (ESO) on behalf of a larger Collaboration | We report on IR VLT adaptive optics (2003 October 7th; H and Ks band) and Chandra (2003 November 1st; HRC-I) ToO observations of the field of the new candidate Anomalous X--ray Pulsar (AXP) XTE J1810-197 (also known as CXOU J180951.1-194351; IAUC 8168 , IAUC 8190 , ATEL #193, ATEL #195, Ibrahim et al. 2003, astro-ph/0310665, and Gotthelf et al. 2003, astro-ph/0309745).
Images in the H and Ks band were obtained (effective exposure time of 42 minutes) with NAOS-CONICA (1024x1024 pixels, 0.027" pixel scale; 28"x28" Field of View) under very good sky and seeing condition (about 0.5"), resulting in an on-axis FWHM of about 0.15" for a point-like source. Limiting magnitudes (S/N~3) of about 23 and 22 (H and Ks, respectively) were inferred and only a few faint sources found within the 2.5" (1sigma c.l) radius uncertainty region obtained based on a previous Chandra HRC-I observation (Gotthelf et al. 2003).
Within the new Chandra image (about 2.9ks of effective exposure time) we found only one source (on-axis), at a count rate level of about 1cts/s , fully consistent with that reported by Gotthelf et al. (2003). A 49+\-2% pulsed fraction pulsation at a period of 5.5391(4)s was found, confirming that the source is indeed XTE J1810-197. The Chandra position is (J2000) 18h09m51.08s, -19d43'51.74", 90% uncertainty radius of about 0.8" (astrometric uncertainty included).
Only one IR Ks=20.8 magnitude object (H-Ks=1.2) was found to be consistent with the Chandra position, implying a (absorbed) F_X/F_IR larger than 10^3. Additional i-Gunn images were obtained from the 3.6m ESO telescope (EFOSC2; 2048x2048 pixels; 0.157" pixel scale; 5'x5' FOV; 84 minutes of effective exposure time; seeing of about 1") on 2003 October 12th. No object was found down to a limiting magnitude of about 24 (i-Ks>3). These optical/IR properties, similar to those of other IR counterparts to AXPs, suggests that we have indeed discovered the IR counterpart to XTE J1810-197.
All these findings, definitively establish the AXP nature of XTE J1810-197, the first confirmed example of transient (or at least highly variable) object of the class. We note that the time-scale of the (X-ray) flux variability detected from this new AXP (of the order of months) suggests a considerably larger number of AXPs in a "low" state likely exist in our Galaxy. Pulsations in the "low" state (if any; see Gotthelf et al. 2003) would easily remain undetected, thus preventing identification of these sources as AXPs. | 2003-11-04 23:12:00 | infra-red,optical,x-ray,neutron star,pulsar,star,transient,variables | 2003-11-04 | 23:12:00 | 2,493 | [
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204 | New X-ray Transient XTE J1748-361 (may be A1744-36) | Ron Remillard, Alan Levine, Dacheng Lin (MIT) and Don Smith (U Michigan) | Observations with the RXTE All-Sky Monitor reveal X-ray emission from a source at (J2000, degrees) 266.97, -36.14 (uncertainty 0.2 degrees at 90% confidence). The source was first detected on Nov. 3 2003, at a flux (2-12 keV) of 42 (7) mCrab, increasing to a range of 100-120 mCrab (daily averages) during Nov. 4-6. The source position is consistent with that of a 1976 transient from the Ariel V mission (A1744-36). This association requires an improved source position, given the 7 degree offset from the Galactic center. The current X-ray source shows a spectrum similar to LMXBs or black hole transients, but not the classical accretion-powered pulsars. | 2003-11-08 03:31:00 | x-ray,black hole,pulsar,transient | 2003-11-08 | 03:31:00 | 657 | [
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] | 203 |
205 | Precise X-ray position of A1744-36 (=XTE J1748-361?) | J. McClintock (CfA), S. Murray (CfA), M. Garcia (CfA) and P. Jonker (IoA) | The Ariel-5 X-ray transient A1744-36 and the newly-discovered transient XTE J1748-361 may be identical (ATEL #204). Based on a 16 ks Chandra ACIS-S observation of A1744-36 made on 2003 May 28, the position of this source is RA(J2000) = 17:48:19.22, Dec(J2000) = -36:07:16.6 (uncertainty < 1"). | 2003-11-08 21:35:00 | x-ray,transient | 2003-11-08 | 21:35:00 | 293 | [
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] | 204 |
206 | OIR observations of A1744-36 (=XTE J1748-361?) | M. Buxton, C. Bailyn (Yale) | We have observed the field of the X-ray transient A1744-36, suggested to be the same as XTE J1748-361 (ATEL #204, #205). Observations were made using the SMARTS 1.3m telescope at CTIO with the ANDICAM camera in V, I and K bands. There is one visible source consistent with the coordinates given in ATEL #205 which has the following magnitudes: UT 2003 Nov 08.999-09.004: V = 18.13 +/- 0.07, I = 16.00 +/- 0.05, K = 13.60 +/- 0.03; UT 2003 Nov 10.001-10.006: V = 18.11 +/- 0.06, I = 16.04 +/- 0.04, K=13.55 +/- 0.03. The source has not brightened significantly over these two nights, nor has it brightened with respect to the Digitized Sky Survey and 2MASS images. We conclude, therefore, that either A1744-36 is not identical to XTE J1748-361 or that the counterpart is not discernable at optical/infrared wavelengths. The magnitude limits of our images are: V = 20.9, I = 19.7, K = 16.1. | 2003-11-11 05:56:00 | infra-red,optical,x-ray,transient | 2003-11-11 | 05:56:00 | 888 | [
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] | 205 |
207 | Archival radio observations of XTE J1810-197 | B. M. Gaensler (Harvard-Smithsonian CfA), C. L. Brogan (IfA, U Hawaii) | We report on deep radio observations made with the Very Large Array (VLA) of the field of the newly discovered anomalous X-ray pulsar (AXP) XTE J1810-197 (also known as CXOU J180951.1-194351; IAUC 8168 , IAUC 8190 , ATEL #188, ATEL #193, ATEL #195, ATEL #203, Gotthelf et al, astro-ph/0309745; Ibrahim et al, astro-ph/0310665).
We have examined archival VLA data at frequencies of 330 and 1420 MHz, to search for both a supernova remnant (SNR) potentially associated with XTE J1810-197, and to look for radio emission from the source itself. The 330 MHz data consist of observations in A, B, C and D arrays, observed throughout 2001 and 2002 (see Brogan et al, astro-ph/0310109). The one-sigma RMS sensitivity in the vicinity of XTE J1810-197 is 3.5 mJy/beam at a resolution of 25 arcsec; our image has complete sensitivity up to scales of 70 arcmin. The 1420 MHz data consist of observations taken in the DnC configuration on 2003 Feb 03 and 2003 Feb 10. The RMS sensitivity is 3.5 mJy/beam at a resolution of 62x35 arcsec; this image is sensitive to scales up to 15 arcmin in extent.
Down to the sensitivities quoted above, we see no evidence for an associated SNR in either data-set, nor do we see any unresolved radio emission at the position of the neutron star. The lack of a detected SNR is not particularly constraining, because of the complex nature of radio emission in this region, behind which a faint remnant could easily be hidden. As is the case for other AXPs and SGRs, the upper limits on emission from the neutron star itself are well above those for the faintest radio pulsars. | 2003-11-18 19:00:00 | radio,x-ray,gamma ray,neutron star,pulsar,soft gamma-ray repeater,star,supernova remnant,supernovae,transient,variables,a comment | 2003-11-18 | 19:00:00 | 1,598 | [
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] | 206 |
208 | Radio observations of XTE J1748-361 (= A1744-36?) | S. Corbel (Univ. Paris 7), R. P. Fender (Univ. Amsterdam), T. Tzioumis (ATNF), C. Brocksopp (MSSL) | We report on radio observations of the recent X-ray transient XTE J1748-361 (ATEL #204), which is possibly coincident with A1744-36 (Atel #205, # 206). Radio observations have been carried out with the Australia Telescope Compact Array (ATCA) on 2003 November 12 (MJD 52955.77). If XTE J1748-361 is associated with A1744-36, then its X-ray position is known to better than 1" based on Chandra observations (Atel # 205). In that case, we do not detect radio emission at the Chandra position of A1744-36 with an rms noise level of 0.15 mJy/beam at 4800 MHz and 8640 MHz. On the contrary, if XTE J1748-361 is unrelated to A1744-36, then its best position is given in Atel #204 with an error circle of 0.2 degree. In that case, we found a new radio source slightly outside the ASM error circle at the following position: alpha(J2000) = 17:48:49.14 and delta(J2000) = -36:00:29.27 with a total positional uncertainty of 0.25", and a flux density of 2.8 +/- 0.2 mJy at 4800 MHz. Further observations would be needed to confirm a possible association with XTE J1748-361. | 2003-11-20 22:28:00 | radio,x-ray,binary,black hole,neutron star,star,transient | 2003-11-20 | 22:28:00 | 1,063 | [
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] | 207 |
209 | The Orbital Period of the X-ray Pulsar XTE SMC144s | R. H.D. Corbet (GSFC and USRA), S. Laycock (CfA), F. E. Marshall (GSFC), C. B. Markwardt (GSFC and University of Maryland), M. J. Coe (Southampton University) | We have detected three additional outbursts from the 144s pulse period transient X-ray pulsar in the direction of the Small Magellanic Cloud with the RXTE Proportional Counter Array since the outburst that was reported in ATEL #163.
We have continued to monitor the SMC since that time with observations made at intervals of approximately one week. The first outburst from "XTE SMC144s" was detected on 2003 May 19 and subsequent outbursts were detected on July 21, September 22, and November 18. These outbursts are all consistent with a recurrence period of approximately two months. A linear fit to these detection times gives
T = MJD 52779.2 (+/- 2.9) + n x 61.2 (+/- 1.6) d
We interpret this outburst recurrence period as the orbital period of a neutron/Be star binary with outbursts occurring at periastron passage. Due to the presence of other active pulsars in the SMC it has not yet been possible to obtain an accurate position for this source.
A list of known X-ray pulsars in the SMC is provided at: http://lheawww.gsfc.nasa.gov/users/corbet/pulsars | 2003-11-21 06:38:00 | x-ray,binary,neutron star,pulsar,star,transient | 2003-11-21 | 06:38:00 | 1,064 | [
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] | 208 |
210 | Radio observations of XTE J1748-361 (=A1744-36?) | M. P. Rupen, V. Dhawan, A. J. Mioduszewski (NRAO) | Very Large Array (VLA) observations of the transient X-ray source XTE J1748-361 (ATEL #204) taken on November 10 UT at 4.86 GHz show:
Following the report of a possible radio counterpart (ATEL #208) at the position of the confusing source mentioned above, we observed that position with the VLA on November 21 UT and detected a complex, quite extended (~10 arcseconds) source, with total flux densities of 73 mJy at 4.86 and 44 mJy at 8.46 GHz respectively. There is also a strong source apparent in the NRAO VLA Sky Survey (NVSS; http://www.cv.nrao.edu/nvss/ ), with a total flux density of about 200 mJy at 1.4 GHz. These detections are consistent with a constant source with spectral index -0.9 between 1.4 and 8.5 GHz, and this together with its appearance (see http://www.aoc.nrao.edu/~mrupen/XRT/X1748-361/x1748-361.shtml for contour plots) suggest that this source is associated with a background active galactic nucleus (AGN) rather than the X-ray transient. There were no other sources within the field-of-view of the interferometer, to limiting rms noise levels at the pointing center of 0.17 mJy/beam at 4.86 GHz (half-power field-of-view: +/-4.4 arcmin) and 0.15 mJy/beam at 8.46 GHz (half-power field-of-view: +/-2.5 arcmin).
The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. | 2003-11-26 08:48:00 | radio,x-ray,agn,binary,black hole,neutron star,star,transient | 2003-11-26 | 08:48:00 | 1,400 | [
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] | 209 |
211 | A very intense X-ray outburst of Vela X-1 detected with INTEGRAL | R. Krivonos (IKI/RSDC, Moscow), N. Produit (ISDC, Versoix), I. Kreykenbohm (IAA, Tubingen & ISDC), R. Staubert (IAA, Tubingen), A. von Kienlin (MPE, Garching), C. Winkler (ESTEC, Noordwijk), N. Gehrels (GSFC, NASA) | We report a very intense hard X-ray outburst detected from Vela X-1 with INTEGRAL/IBIS in the course of deep Core Program observations of the Vela region.
The outburst began on November 28, 2003 at 02:32:52 UT and lasted 15.2 ksec. The S/N ratio measured from the source at the image reached ~270 standard deviations. From a preliminary analysis the photon flux in the 15-40 keV band of ISGRI was seen to raise by an order of magnitude from less then 500 mCrab to about 7 Crab during the first 5400 s (three pointings). In the 40-60 keV band, the flux increased from ~125 mCrab to more than 1 Crab. Then the flux steadily decreased. We saw obvious oscillations in the count rate with the Vela X-1 spin period during the whole duration of the outburst.
The source was also detected with SPI (at the S/N ratio of ~170 sigma in the energy band 20-40 keV). The spectrum measured by SPI did not show any significant changes, except the spectrum being harder than usual, during the outburst. Unfortunately, the source was outside the JEM-X field of view at this epoch.
It seems it is the first time that the source demonstrates such an outburst during the whole history of its observations. The current monitoring shows that its flux is still above the persistent level. We encourage follow up observations at other wavelengths. | 2003-12-02 22:00:00 | radio,far-infra-red,infra-red,optical,x-ray,gamma ray,binary,neutron star,pulsar,star,request for observations | 2003-12-02 | 22:00:00 | 1,325 | [
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212 | The XMM-Newton Spectrum of 4U 1543-475 in the Low/Hard State and a Comment on Accretion Flow Constraints in this Regime | J. M. Miller (CfA), A. C. Fabian (IoA), W. H. G. Lewin (MIT) | We have analyzed an XMM-Newton/EPIC-pn spectrum of the Galactic black hole 4U 1543-475 in the low/hard state available in the public archive. The 19.5 ksec exposure started on 2002-08-18 UT 12:53:32. The detector was run in "small window" mode with the "thin" optical blocking filter. SAS 5.4.1 was used for data reduction tasks. Source events were extracted in a circle (radius = 24 arcsec) centered on the source position. Background events were extracted in an annulus. Standard event screening was applied according the recipes in the MPE XMM-Newton cookbook. Custom response matrices were generated. After binning to require 15 counts per bin, the spectrum was analyzed on the 0.3-10.0 keV range using XSPEC 11.2. A simple absorbed power-law model (phabs*powerlaw) gives N_H = 3.8(2) E+21 atoms/cm^2, Gamma = 2.00(5), and K(pl) = 1.02(5) E-3, and chi-squared/dof = 695.1/658 (errors are 90% confidence). This corresponds to an unabsorbed flux of 5.74 E-12 erg/cm^2/s, or a luminosity of 3.9 E+34 erg/s for a distance of 7.5 kpc (Park et al. 2003). Given that 16,500 counts were recorded (after subtracting the background), the low column density along the line of sight to 4U 1543-475, and the superb low-energy sensitivity of the EPIC-pn camera, this spectrum is among the very best ever obtained from a Galactic black hole at such a low luminosity. We have therefore calculated a number of limits and briefly explored what can and cannot be ruled-out in this regime. The 95% confidence upper limits on the strength of a narrow Fe K-alpha emission line (narrow meaning equivalent to, or less than, the instrument resolution) ranges between 140-260 eV in the 6.40-6.97 keV band. The 95% confidence upper limit on a relativistic Laor Fe K-alpha emission line with r_in fixed at 3 r_g is 200 eV (r_g = GM/c^2). Adding a multi-color disk (MCD) blackbody component improves the fit at the 3 sigma level. With this model, we measure N_H = 5(1) E+21 atoms/cm^2, kT = 0.19(5) keV, K(MCD) = 130 +/- 120, Gamma = 1.98(7), and K(pl) = 1.0(1) E-3 for chi-squared/dof = 680.7/656. Clearly, the normalization of the MCD component is not well constrained. Taking the source inclination to be zero (note that any non-zero inclination would give larger color radii) and the distance to be 7.5 kpc, this normalization translates to an inner disk color radius of 9km. This is probably unphysical, since 1 r_g ~ 15 km for M_BH = 10 Msun. If we apply Shimura & Takahara's (1995) color conversion factor of 1.7, the inner radius becomes 25 km. Merloni, Fabian, & Ross (2000) have reported that a color conversion factor of f = 3 is possible when the corona dominates; this correction gives an inner disk radius of 77 km, which could correspond to the innermost stable circular orbit (see Park et al. 2003). Reflection from a neutral disk at the innermost stable circular orbit should generate an Fe K line with an equivalent width of approximately 180 eV (George & Fabian 1991), which is within the confidence limits calculated above. This model is a minor statistical improvement over a power-law and does not represent the detection of an inner accretion disk, but it clearly shows that an inner disk cannot be ruled-out statistically. The fact that this high quality X-ray spectrum obtained in the L_X = 10^(34-35) erg/s range cannot rule-out an inner disk, means that the power-law models often fit to lower quality spectra obtained in this regime (and fit to the spectra of sources at lower-luminosities) cannot be used to infer that an inner disk is absent, as per the predictions of some advection-dominated or jet-dominated accretion flow models. Either family of models may be valid, but the inner geometries assumed in such models are not proven based on power-law X-ray spectra. [Indeed, jet models might be aided by an inner disk, as many models for jet formation depend on a disk.] As geometric constraints are more easily obtained through spectral models than by e.g. break frequencies in power density spectra (which lack a clear physical interpretation), this result indicates (a) that far longer X-ray exposures are needed and (b) that multi-wavelength observations are required to constrain accretion flow models at low X-ray luminosities. | 2003-12-05 05:01:00 | optical,x-ray,binary,black hole,transient,a comment | 2003-12-05 | 05:01:00 | 4,241 | [
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] | 211 |
213 | Radio observations of Vela X-1 during its current intense X-ray outburst | G. Tsarevsky (ATNF, CSIRO, Sydney & ASC FIAN, Moscow) & D. McConnell (ATNF, Sydney) | We report radio observation of the high mass X-ray binary Vela X-1 (=GP Vel), which showed a very intensive hard X-ray outburst detected with INTEGRAL (Krivonos et al., ATEL # 211). Observations with the Australia Telescope Compact Array (6-km configuration, night time, good weather conditions) at 4800 and 8600 MHz on 2003DEC06 from 14:20:00 to 15:50:00 UT (90 min integration) shows no radio detection at the level of 0.6 and 0.8 mJy (5-sigma) respectively. Further monitoring of Vela X-1 will depend on any new relevant behaviour detected by other observer. | 2003-12-07 09:28:00 | radio,x-ray,binary,neutron star,star,variables | 2003-12-07 | 09:28:00 | 561 | [
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] | 212 |
214 | A New Transient X-ray Pulsar in the SMC (XTE J0055-727) | R. H.D. Corbet (GSFC and USRA), C. B. Markwardt (GSFC and University of Maryland), M. J. Coe & W. R.T. Edge (Southampton University), S. Laycock (CfA), F. E. Marshall (GSFC) | We have detected a new transient X-ray pulsar in the direction of the Small Magellanic Cloud with the RXTE Proportional Counter Array. The source was detected within the 2 degree FWZI field of view of the PCA while pointed at R.A. = 00h53m53s, Decl. = -72o26m42s (equinox 2000.0). Pulsations with periods of 18.37s +/- 0.01, 18.36s +/- 0.01, and 18.37s +/- 0.1 were seen on 2003 November 26, December 4 and December 11 respectively. From slews made over this region in all observations we derive a position of R.A. = 13.84, Decl. = -72.70 (equinox 2000). The error box is ellipsoidal with maximum extent 2 sigma statistical errors of approximately 0.1 degrees (arc length) in R.A. and 0.06 degrees in declination. Systematic errors on the source position are unknown but may well be significant as the region contains a complex superposition of transient sources. The statistical error box is available at http://lheawww.gsfc.nasa.gov/users/corbet/pulsars/xtej0055-727_ebox.ps. Collimator response corrected count rates of 4.4 +/- 0.1 (2.2 mCrab), 5.1 +/- 0.1 (2.6 mCrab), and 3.9 +/- 0.1 (2.0 mCrab) counts/s/Proportional Counter Unit were obtained respectively. The source was not detected in observations made on November 18. We note the presence of the emission line objects AzV164 and [MA93] 829 close to the center of our error box for this source.
A list of known X-ray pulsars in the SMC is provided at: http://lheawww.gsfc.nasa.gov/users/corbet/pulsars | 2003-12-17 05:33:00 | x-ray,binary,pulsar,transient | 2003-12-17 | 05:33:00 | 1,462 | [
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] | 213 |
215 | Position of RXTE 82.4s pulsar (XTE J0052-725) determined using archive Chandra Data. | W. R.T. Edge & M. J. Coe (Southampton University), R. H.D. Corbet (GSFC and USRA), C. B. Markwardt (GSFC and University of Maryland), S. Laycock (CfA), F. E. Marshall (GSFC) | We have determined the position of pulsar XTE J0052-725 from an analysis of archive Chandra data. This source was detected by RXTE on June 19 and 26, 2002 and the results were published in IAUC # 7932 . We noted that there was an X-ray source at R.A. = 00h52m09.1s Decl. = -72º338m03s (equinox 2000), with a 90% confidence radial uncertainty of 0.6 arcsec, in Chandra Observation ID 2946 which took place between 2002-07-04 06:47:00 and 2003-07-09 10:37:01 (Zezas et al. astro-ph/0310562, 2003). We carried out a timing analysis of this object and found a period of 82.46 seconds +/- 0.18 seconds. This is within 0.06s of the RXTE period and the position lies 6 arc minutes from the original mean RXTE location. We have identified this source with the optical counterpart MACS J0052-726#004 R.A. = 00h52m09.09201s Decl. = -72º338m03.06872s. | 2003-12-19 00:56:00 | optical,x-ray,binary,pulsar,transient | 2003-12-19 | 00:56:00 | 844 | [
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216 | Correction to ATEL#215, position of RXTE 82.4s pulsar (XTE J0052-725). | W. R.T. Edge & M. J. Coe (Southampton University), R. H.D. Corbet (GSFC and USRA), C. B. Markwardt (GSFC and University of Maryland), S. Laycock (CfA), F. E. Marshall (GSFC) | The co-ordinates given for the X-ray source and its counterpart in ATEL#215 contained typographical errors. The correct co-ordinates for the source are: R.A. = 00h52m09.1s Decl. = -72º38m03s (equinox 2000). Similarly those for the optical counterpart are: R.A. = 00h52m09.1s Decl. = -72º38m03s. | 2004-01-02 19:41:00 | optical,x-ray,binary,pulsar,transient | 2004-01-02 | 19:41:00 | 296 | [
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] | 215 |
217 | Two new X-ray pulsars detected in the SMC using archive Chandra data (CXOU J005527.9-721058 and CXOU J005455.6-724510). | W. R.T. Edge, M. J. Coe and V. A. McBride (Southampton University) | Two new X-ray pulsars have been detected in the SMC using archive Chandra data. An examination of Chandra Observation ID 2948, which took place between 2002-07-04 09:47:57 and 2002-07-04 12:45:44 (Zezas et al. astro-ph/0310562, 2003), shows an X-ray source at R.A. = 00h55m27.9s Decl. = -72d10m58s (equinox 2000) with a 90% confidence radial uncertainty of 0.6 arcsec. Timing analysis on this object revealed a period of 34.08 seconds +/- 0.03 seconds with a confidence of 98.5%. The position of this pulsar is within the 13 arcsec 90% confidence error radius of the ROSAT source RX J0055.4-7210. Similarly, an X-ray source at R.A. = 00h54m55.6s Decl. = -72d45m10s (equinox 2000), with a 90% confidence radial uncertainty of 0.6 arcsec, was noted in Chandra Observation ID 2946, which took place between 2002-07-04 06:48:04 and 2002-07-04 09:47:57. This was found to have a period of 503.5 seconds +/- 6.7 seconds at a >99% level of confidence. Selective analysis of the source region makes it unlikely that this period is a harmonic of the 1000s Y dithering frequency, moreover no significant pulse period was found at 1000 seconds. This object is very close to RX J0054.9-7245 = AX J0054.8-7244 which is listed in both Haberl & Pietsch (2003, astro-ph/0311092) and Yokogawa et al (2003, PASJ 55, 161) as a HMXB pulsar candidate. | 2004-01-15 21:16:00 | x-ray,binary,pulsar,transient | 2004-01-15 | 21:16:00 | 1,330 | [
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] | 216 |
218 | Correction to ATEL #182 (XTE J1739-302) | D. M. Smith (UC Santa Cruz), W. A. Heindl (UC San Diego) | The Chandra coordinates reported for XTE J1739-302 in ATEL #182 were incorrect by approximately 6 arcsec due to a typographical error. The correct coordinates are
RA = 17 39 11.58, DEC = -30 20 37.6
This is approximately 0.65 arcsec from the counterpart found in the USNO A2.0 catalog, 0525 28760590.
We apologize for the error. | 2004-01-18 05:03:00 | x-ray,transient | 2004-01-18 | 05:03:00 | 331 | [
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] | 217 |
219 | XMM-Newton TOO observation of the SMC field around XTE J0055-727: Two transient X-ray pulsars in outburst (XMMU J005455.4-724512 and XMMU J005517.9-723853). | F. Haberl (MPE), W. Pietsch (MPE), N. Schartel (ESA, Vilspa), P. Rodriguez (ESA, Vilspa) and R. H.D. Corbet (GSFC and USRA) | An XMM-Newton target of opportunity observation of the field around the transient pulsar XTE J0055-727 (ATEL #214) in the Small Magellanic Cloud was performed on 2003-12-18 between 14:32 UT and 19:48 UT. Two bright X-ray sources were detected by the EPIC instruments. XMMU J005455.4-724512 is consistent in position with CXOU J005455.6-724510 = RX J0054.9-7245 = AX J0054.8-7244 (ATEL #217) and a pulse period of 499.2 +/- 0.7 s was derived. A preliminary spectral analysis reveals a spectrum typical for a (Be) high mass X-ray binary pulsar with a luminosity of 4.3 x 10^35 erg/s (0.5 - 10 keV) for an assumed SMC distance of 60 kpc. The second source XMMU J005517.9-723853 shows a similar X-ray spectrum with a luminosity of 2.9 x 10^35 erg/s (0.5 - 10 keV) and pulsations with a period of 701.6 +/- 1.4 s were discovered. The position of this new pulsar is R.A. = 00h55m17.9s Decl. = -72d38m53s (equinox 2000) with a 3 arcsec systematic 90% confidence error and is located within the 9 arcsec error radius of the ROSAT source RX J0055.2-7238 (Haberl et al. 2000, A&AS 142, 41). Several other weak sources were seen in the EPIC images but the fluxes of these sources are too low for pulsations to be detected. The 18.37 s pulsations from XTE J0055-727 were still detected from an RXTE observation on 2003-12-15 but not seen during an RXTE observation on 2003-12-20 which, together with the XMM-Newton observation, indicates that XTE J0055-727 faded between 2003-12-15 and 2003-12-18. | 2004-01-22 16:15:00 | x-ray,binary,pulsar,transient | 2004-01-22 | 16:15:00 | 1,485 | [
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220 | A new X-ray pulsar has been detected in the SMC using archive Chandra data (CXOU J005323.8-722715). | W. R.T. Edge, M. J. Coe and V. A. McBride (Southampton University) | A new X-ray pulsar has been detected in the SMC using archive Chandra data. An examination of Chandra Observation ID 2947, which took place between 2002-07-20 23:03:50 and 2002-07-21 01:46:41 (Zezas et al. astro-ph/0310562, 2003), shows an X-ray source at R.A. = 00h53m23.8s Decl. = -72d27m15s (equinox 2000) with a 90% confidence radial uncertainty of 0.6 arcsec. Timing analysis on this object revealed a period of 138.04 seconds +/- 0.61 seconds with a confidence of 98%. The position of this pulsar is coincident with emission-line star [MA93] 667 and also with MACHO object 207.16202.50 at R.A.=0h53m23.9s Decl.= -72d27m15s (equinox 2000). The latter shows evidence of a period of 125 days +/- 1.5 days. This period would be consistent with that predicted from the Corbet diagram for a 138s Be/X-ray pulsar. | 2004-01-23 00:45:00 | x-ray,binary,pulsar,star,transient | 2004-01-23 | 00:45:00 | 812 | [
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] | 219 |
221 | Variability in the X-ray Warm Absorber in GX 339-4 | J. M. Miller (CfA), J. Raymond (CfA), A. C. Fabian (Cambridge), R. Wijnands (Amsterdam), M. van der Klis (Amsterdam), W. H. G. Lewin (MIT) | We have previously reported evidence for a Seyfert-like warm absorber in the stellar-mass Galactic black hole GX 339-4, based on a Chandra/HETGS spectrum obtained during a 75 ksec observation during its 2002-2003 outburst starting on 2003 March 17.8 [1]. The ionized absorption lines detected with this observation were strong, but showed little variability on the timescale of the observation. Variability is perhaps the most important property for ascribing X-ray absorption lines to an accreting source, rather than to absorption in the ISM (which is also a possibility for GX 339-4). There are weak indications for a variable warm absorber in XTE J1650-500 [1]. To search for variability in the putative absorber in GX 339-4, we have analyzed the XMM-Newton/RGS spectra obtained during our 76 ksec observation starting on 2002 Sept. 29.4. Note that the XMM-Newton observation preceded the Chandra observation by half a year. Deconvolution of the broad-band XMM-Newton spectrum gives an unabsorbed 0.5-10.0 keV flux of 2.1 E-8 erg/cm^2/s [2]; the flux during the Chandra observation was 4.2 E-9 erg/cm^2/s [1]. The RGS spectra were reduced using SAS version 5.4.1, and analyzed using ISIS version 1.1.3. To reduce pile-up, single CCDs covering the same wavelength range in the RGS-1 and RGS-2 arrays were read-out for approximately 36 minutes at a time. Comparison with the Chandra/HETGS spectra revealed that pile-up was negligible in the ranges considered here. The spectra were fit jointly; the continua were fit with local power-law spectra and absorption line upper limits were calculated using Gaussians with wavelength and FWHM values fixed to those measured with Chandra [1]. O VIII (18.967 A), Ne II (14.631 A), Ne III (14.526 A), and Ne IX (13.447 A) absorption line equivalent widths of 19(5) mA, 13(1) mA, 11(1) mA, and 17(1) mA (respectively) were measured in the later Chandra/HETGS spectrum. In constrast, the 95% confidence upper limits on these lines in the prior XMM-Newton/RGS spectra are 23 mA, 8 mA, 6 mA, and 2 mA (respectively). Equivalent width is directly related to the absorbing column density. Where the XMM-Newton spectra are most sensitive, it is clear that the column density was significantly lower in the early/bright phase of the outburst, than in the decline of the outburst. Absorption in the coronal ISM provides an attractive explanation for these absorption lines [1], and even the variability measured here cannot definitively rule-out such an explanation. However, this variability strongly suggests that a significant part of the absorbing gas is local to the source, and suggests that the ISM plays a lesser role. A modest disk wind or shell ejection is capable of producing a warm absorber of the kind implied in GX 339-4 [1]. [1] Miller, J. M., et al., 2004a, ApJ, in press, astro-ph/0307394 [2] Miller, J. M., et al., 2004b, ApJ, subm., astro-ph/0312033 | 2004-01-23 03:55:00 | x-ray,binary,black hole,transient,variables,a comment | 2004-01-23 | 03:55:00 | 2,902 | [
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222 | State/Spectral Transition of the Ultraluminous Supersoft X-ray Source in M101 | A. K.H. Kong and R. Di Stefano (Harvard-Smithsonian Center for Astrophysics) | We analyzed recent archival Chandra observations of the spiral galaxy, M101, taken between 2004 Jan 19 and 2004 Jan 24. The ultraluminous supersoft X-ray source (CXOU J140332.3+542103) reported by Mukai et al. (2003) and Di Stefano and Kong (2003) was detected in 2 of 3 recent Chandra ACIS-S observations. In the first 56 ksec observation taken on 2004 Jan 19, 27 counts were detected in 0.1-7 keV, with 19 counts below 1.1 keV. The count distribution indicates that the source spectrum is not supersoft (Di Stefano and Kong 2003). By assuming a power-law spectrum with N_H=1e21 cm^-2 and photon index of 2, the unabsorbed 0.3-7 keV luminosity is 2.3e37 erg/s (d=6.7 Mpc). This luminosity is nearly a factor of 200 fainter than the very first Chandra observation taken on 2000 March 26 (Mukai et al. 2003; Di Stefano and Kong 2003). The source was not detected in the second short (3 ksec) observation taken on 2004 Jan 21, with a 3-sigma detection limit of 1.9e38 erg/s. During the third 22 ksec observation taken on 2004 Jan 24, the source was seen at 3.6e37 erg/s, assuming the same power-law spectral model. The source was also harder in the third observation, with 10 out of 17 counts from below 1.1 keV. The recent Chandra observations indicate that the source is currently in transition, possibly to the low/hard state. [1] Mukai, K. et al. 2003, ApJ, 582, 184 [2] Di Stefano, R. and Kong, A.K.H. 2003, ApJ, 592, 884 | 2004-01-28 19:12:00 | x-ray,binary,black hole | 2004-01-28 | 19:12:00 | 1,424 | [
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223 | IGR J06074+2205 a new X-ray source discovered by INTEGRAL | J. Chenevez, C. Budtz-Jorgensen, N. Lund, N. J. Westergaard (Danish Space Research Institute, Copenhagen), P. Kretschmar (ISDC, Geneva & MPE, Garching), J. Rodriguez (CEA, Saclay & ISDC, Geneva), A. Orr (ESTEC, Noordwijk), Wim Hermsen (SRON, Utrecht) | We report the discovery of a new source, IGR J06074+2205, at RA=06h07.4m DEC=22°05' (+-2 arcmin) with both JEM-X telescopes on board INTEGRAL. The source was detected during public observations of the Crab region performed between 15 and 16 February 2003 in the context of the calibration of the INTEGRAL instruments. IGR J06074+2205 was detected with a flux of ~7 mCrab (+-2 mCrab) between 3 and 10 keV, and about 15 mCrab in the 10-20 keV range during a stable 67 ks pointing on Feb. 15 2003. It was also detected in another similar ~16ks pointing on Feb. 16 2003 with an average flux less than 5 mCrab. It was located 7.65 degrees from the Crab, which was outside the JEMX field of view in these two particular pointings. This new source has not been detected in later observations of the same region. A corresponding investigation with the IBIS/ISGRI instrument reveals a source at a position consistent with the JEM-X position between 25 keV and 100 keV. Unfortunately, the alignment of the source with the Crab in the instrument coordinate system prevents a more detailed analysis. The closest known X-ray source, 1RXS J060731.8+222120, lies 14 arcmin away from the new INTEGRAL source position, well outside the uncertainty circle of JEM-X position. Analyses at other wavelengths are strongly encouraged to better understand the nature of this new source. | 2004-01-29 23:25:00 | x-ray,transient | 2004-01-29 | 23:25:00 | 1,363 | [
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224 | Two New INTEGRAL Sources: IGR J15479-4529 and IGR J16418-4532 | J. A. Tomsick and R. Lingenfelter (UC San Diego), S. Corbel (Universite Paris 7 and CEA Saclay), A. Goldwurm (CEA Saclay), and P. Kaaret (Harvard-Smithsonian CfA) | We report on detections of two new INTEGRAL sources by the IBIS/ISGRI instrument during a 290 ks observation of the black hole X-ray transient 4U 1630-47 taken during 2003 February 1-5. IGR J15479-4529 is detected at a significance of 17-sigma with coordinates R.A. = 15h47m.9 and Decl. = -45o29' (J2000, 2' uncertainty). Its 20-40 keV flux is 3 x 10^-11 erg/cm^2/s, using the current (OSA-3.0) ISGRI response matrix, and it is detected at a significance of 7-sigma in the 40-60 keV energy band. The best INTEGRAL source position is within 3' of the intermediate polar 1RXS J154814.5-452845, which was strongly detected by XMM-Newton out to 10 keV (Haberl, Motch, & Zickgraf 2002, A&A, 387, 201), suggesting a possible association. IGR J16418-4532 has coordinates R.A. = 16h41m.8 and Decl. = -45o32' (J2000, 2' uncertainty). In the 20-40 keV band, it is detected at 17-sigma with a flux of 3 x 10^-11 erg/cm^2/s. This source is close to the Galactic plane (b = +0.5 degrees), and is one of several INTEGRAL sources that have been found in the Norma Region. | 2004-01-30 11:34:00 | x-ray,black hole,cataclysmic variable,neutron star,star,transient,variables | 2004-01-30 | 11:34:00 | 1,056 | [
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225 | SMC X-3 Identified with RXTE 7.78s Pulsar from Archive Chandra Data. | W. R.T. Edge & M. J. Coe (Southampton University), R. H.D. Corbet (GSFC and USRA), C. B. Markwardt (GSFC and University of Maryland), S. Laycock (CfA) | SMC X-3 (Clark et al. 1978, ApJ, 221, L37) has been identified with a previously detected 7.78s RXTE pulsar by using archive Chandra Data. An examination of Chandra Observation ID 2947, which took place between 2002-07-20 23:03:50 and 2002-07-21 01:46:41 (Zezas et al. astro-ph/0310562, 2003), shows SMC X-3 at R.A. = 00h52m05.7s Decl. = -72d26m05s (equinox 2000) with a 90% confidence radial uncertainty of 0.6 arcsec. This is consistent with the position of the optical counterpart proposed for SMC-X-3 by Crampton et al. (1978, ApJ, 223, L79). The ACIS-I count rate implies a luminosity of about 2.2x10^36 erg/s assuming a distance of 65 kpc. Timing analysis shows the Chandra object to have a pulse period of 7.781s +/- 0.002s with a confidence of >98%. An X-ray pulsar with a pulse period of 7.781s +/- 0.002s was detected by RXTE in early 2002 and on eight subsequent occasions, giving a probable binary period of 45.1 +/- 0.4 days (Corbet et al. 2003, AAS HEAD, 35, 1730C). The position of the RXTE source was tentatively determined to be within 15 arcmins of the known position of SMC X-3. An examination of the RXTE data shows that an outburst was detected in an observation which took place on MJD 52478, three days after the Chandra observation on MJD 52475. It is concluded that all these observations are of the same object, namely SMC X-3. | 2004-01-30 15:45:00 | optical,x-ray,binary,pulsar,transient | 2004-01-30 | 15:45:00 | 1,353 | [
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] | 224 |
226 | IGR J06074+2205 - possible association with radio source | Guy Pooley (MRAO, Cavendish Lab, Cambridge UK) | The radio source NVSS J060718+220452 (34.9 mJy at 1.4 GHz, resolution 45 arcsec: Condon et al AJ 115 1693 (1998)) lies some 80 arcsec from the reported position of the transient X-ray source IGR J06074+2205 (ATEL #223). While this is within the current uncertainty in the X-ray position, it may be a chance coincidence. An observation with the Ryle Telescope, Cambridge, at 15 GHz on 2004 Jan 29 shows an unresolved source (resolution 25 x 65 arcsec2) of 4.0 +/- 0.2 mJy. There is no other source above the noise level within the primary beam (6 arcmin FWHM). Assuming that the flux density at 1.4 GHz is unchanged, the radio spectral index is 0.9 (where positive spectral index means flux density decreasing with increasing frequency) | 2004-01-30 18:00:00 | radio,x-ray,transient | 2004-01-30 | 18:00:00 | 735 | [
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227 | IGR J16393-4643 a possible X-ray counterpart to 3EG J1639-4702 discovered by INTEGRAL | Malizia A., L. Bassani, G. Di Cocco and J. B. Stephen (IASF/CNR Bologna), R. Walter and A. Bodaghee (INTEGRAL Science Data Center) and A. Bazzano (IASF/CNR Roma) | We report the detection of a source, IGR J16393-4643, at RA (2000)= 16h 39.3m and Dec(2000)= -46o 43' (2 arcmin uncertainty) with the IBIS/ISGRI telescope on board INTEGRAL. The source is detected at ~ 20 sigma level in the 20-100 keV range in a cumulative exposure of the Norma Region ( ~700 ks) with an average flux of approximately 5 x 10^(-11) erg cm^(-2) s^(-1) (about 3 mCrab). Segmentation of the observing period into 4 parts, indicates variability of the source (detection level ranges from 13 sigma in March 2003 to 5 sigma in August/September 2003). Within the ISGRI error box lies AX J1639.0-4642 a bright (approximately 2 x 10^(-11) erg cm^(-2) s^(-1) in the 0.7-10 keV band), flat (photon index=-0.01) and variable ASCA source (Sugizaki et al. 2001, ApJS 134, 77). IGR J16393-4643 lies at ~20 arcmin from the EGRET optically unidentified source 3EG 1639-4702, well within the 95% EGRET error box. After IGR J16316-4028 (Atel #201), IGR J16393-4643 is the second INTEGRAL source likely to be the (hard) X-ray counterpart to an EGRET source. At least four other objects detected by ISGRI fall within the 99.9% EGRET contours, making this part of the sky particularly interesting. Follow-up observations of IGR J16393-4643 and surrounding region are highly encouraged. | 2004-01-30 21:06:00 | x-ray,gamma ray,black hole,variables | 2004-01-30 | 21:06:00 | 1,279 | [
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] | 226 |
228 | Her X-1 Apparently Entering A New Anomalous Low State | Patricia Boyd (UMBC and GSFC) and Martin Still (USRA and GSFC) | Her X-1 (= HZ Her) appears to be evolving towards another anomalous low state. RXTE ASM count rates have decreased steadily from 8 cts/s to 1 cts/s at the peak of the long-high state over the last six 35-day precession cycles. This would be the fourth such time Her X-1 has dropped into an anomalous low state, where the 35 day X-ray cycle turns off yet the 35 day optical cycle continues unabated. This event, combined with the times of the previously observed anomalous low states (in 1983, 1993 and 1999) suggest a 5-10 year recurrence time scale for the behavior. During the anomalous low state, the X-ray source appears as an ADC spectrum with additional Compton reflection from the companion star. Models for the phenomenon involve either mass transfer rate and/or accretion disk structure evolution. The pulse period, which is typically spinning-up in Her X-1, has been observed to spin down rapidly during previous anomalous low states. Pointed observations over energy bands from IR to hard X-rays are encouraged as the source evolves. | 2004-02-01 04:41:00 | optical,x-ray,binary,neutron star,pulsar,star,request for observations | 2004-02-01 | 04:41:00 | 1,044 | [
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229 | 14 New Unidentified INTEGRAL Sources | R. Walter, A. Bodaghee (ISDC Geneva); E. J. Barlow, A. J. Bird, A. Dean, A. B. Hill, S. Shaw (Southampton); A. Bazzano, P. Ubertini (IASF Roma); L. Bassani, A. Malizia, J. B. Stephen (IASF Bologna); G. Belanger, F. Lebrun, R. Terrier (CEA Saclay) | We report the detection of 14 new unidentified hard X-ray sources by the IBIS/ISGRI instrument onboard INTEGRAL. The sources have been detected in all-sky mosaics built from data of the INTEGRAL core program accumulated between February 27 and October 19, 2003. | 2004-02-09 14:38:00 | x-ray,gamma ray,binary,black hole,neutron star,star | 2004-02-09 | 14:38:00 | 261 | [
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230 | Increased radio and optical activity in GX 339-4 | Michelle Buxton (Yale), Elena Gallo, Rob Fender (U. Amsterdam), Charles Bailyn (Yale) | Recent optical and radio observations of the black hole X-ray binary jet source GX 339-4 reveal it to be in a brighter optical and radio state since observations were last made in 2003. On UT 2004 Feb 05.34, observations made with the 1.3m CTIO telescope using ANDICAM yielded V=17.7, compared to UT 2003 Oct 27.00 when V=19.5. Radio observations with the Australia Telescope Compact Array measure a flux density at 8.2 GHz of ~0.6 mJy on 2004 Feb 4/5, compared to an upper limit of <0.1 mJy on 2003 Dec 22 (see also ATEL #196). These data indicate that GX 339-4 is probably still in the hard X-ray state but is in the process of brightening. We will be continuously monitoring this object in optical and infrared bands on a daily basis. | 2004-02-09 22:16:00 | radio,optical,x-ray,binary,black hole,transient | 2004-02-09 | 22:16:00 | 737 | [
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] | 229 |
231 | Renewed X-ray activity in GX 339-4 | D. M. Smith (U. C. Santa Cruz), W. A. Heindl (U. C. San Diego), J. H. Swank (NASA/GSFC), J. Wilms (IAA Tuebingen), K. Pottschmidt (ISDC) | Recent monitoring of GX 339-4 in the 2-30 keV X-ray band by the Proportional Counter Array (PCA) of the Rossi X-ray Timing Explorer (RXTE) shows that the newly reported activity in the optical and radio (ATEL #230) is accompanied by faint X-ray emission. On February 1 at 04:00 UT, the X-ray count rate was 1 count/second/Proportional Counter Unit (PCU). On February 9 at 05:40 UT, the rate was about 6 times higher, yielding sufficient statistics for a spectral fit, which shows the source to be in the hard state (photon power law index 1.55). For comparison, the highest count rate seen in the hard state for GX 339-4 in its last outburst (ATEL #85) was about 900 counts/second/PCU. The next RXTE monitoring observations in this series are on February 13 and February 16. Other observations are encouraged. | 2004-02-10 15:25:00 | radio,optical,x-ray,binary,black hole,transient,request for observations | 2004-02-10 | 15:25:00 | 809 | [
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232 | 17 New Identified INTEGRAL Sources | L. Bassani, A. Malizia, J. B. Stephen (IASF Bologna Italy); A. Bazzano, P. Ubertini (IASF Roma Italy); E. J. Barlow, A. J. Bird, A. J. Dean, A. B. Hill, S. E. Shaw (Southampton University Southampton UK); R. Walter, A. Bodaghee (ISDC Geneva Switzerland); G. Belanger, F. Lebrun, R. Terrier (CEA Saclay France); R. Much (RSSD ESTEC/ESA Nordwijk The Netherlands) | We report the first detection in the hard X-ray band (>20 keV) of 17 known sources. The sources have been detected by the IBIS/ISGRI instrument on board INTEGRAL and found in all-sky mosaics built from data of the INTEGRAL core program accumulated between February 27 and October 19, 2003. Number ISGRI Ra&Dec(2000) Probable Identification Type Sigma N.1 18 55.0 -31 09.8 4U1849-31 Cat Var 22 N.2 18 38.1 -06 55.4 AXJ1838.0-0655 X-ray source 7 N.3 16 49.6 -43 49.9 PSRJ1649-4349/PMN1649-4352 Pulsar/Radio 8 N.4 21 42.8 +43 34.2 SSCygni Dwarf Nova 7 N.5 17 41.8 -12 12.3 2E1739.1-1210 X-ray source 6 N.6 18 20.5 -14 32.9 AXJ1820.5-1434 HMXRB 21 N.7 17 00.4 -42 20.2 AXJ1700.2-4220 X-ray source 7 N.8 17 45.7 -28 59.5 2E1742.5-2858 LMXRB 21 N.9 01 18.0 +65 15.3 4U0114+65 HMXRB 9 N.10 18 41.3 +04 56.1 1E1841-045/Kes73 SNR/Pulsar 10 N.11 18 46.4 -02 57.8 AXJ1846.4-0258/Kes75 SNR/pulsar 9 N.12 18 33.6 -10 33.2 SNR021.5-00.9 SNR 12 N.13 18 45.7 00 51.5 Ginga1843+00 HMXRB 8 N.14 19 40.1 -10 24.4 RXJ1940.1-1025 Cat Var 7 N.15 19 42.6 -10 19.6 NGC6814 Seyfert1 7 N.16 22 07.9 +54 32.5 4U2206+54 HMXRB 22 N.17 18 07.0 -29 25.3 XTEJ1807-294 Msec pulsar 17 The error radius of each position is smaller than 3 arcmin (90% confidence level). Statistical significances are measured between 20 and 40 keV. Properties of these sources will be presented in Bird et al. (2004). | 2004-02-13 22:01:00 | radio,x-ray,gamma ray,agn,binary,black hole,cataclysmic variable,nova,pulsar,supernova remnant,supernovae,variables | 2004-02-13 | 22:01:00 | 1,376 | [
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233 | First Detection of the X-ray Burster 2S 1711-339 in Quiescence and a Suggested Optical Counterpart. | M. A.P. Torres (CfA), J. E. McClintock (CfA), M. R. Garcia (CfA), S. S. Murray (CfA) | We report on a Chandra observation of the transient low-mass X-ray binary and type-I X-ray burst source 2S 1711-339 (Carpenter et al. 1977,MNRAS,179,270; Wilson et al. 2003,ApJ,596,1220). The 2S 1711-339 region was observed with the Chandra ACIS-S3 CCD array for 25 ks on 2003 February 07. A total of 64 counts were detected from a source at R.A. = 17h:14m:19s.73, decl. = -34:02:46.9 (J2000), a position consistent with the precise position of 2S 1711-339 obtained earlier during outburst (Cornelisse et al. 2002,A&A,392,885). We fitted the Chandra spectrum using a blackbody model with the column density fixed at 1.5e22 cm-2 (Cornelisse et al. 2002) to derive an X-ray flux of 2e-15 ergs cm-2 s-1 (0.3-7.0 keV). This flux is a factor of 50 below the limit on the quiescent flux obtained by Wilson et al. (2003) and represents a definitive detection of 2S 1711-339 during quiescence. We determined the position of the probable optical counterpart of 2S 1711-339 by matching USNO-B1.0 stars against six 5-min R-band images of the field that we acquired at the 6.5-m Magellan telescope with the MagIc camara at the Las Campanas Observatory. The frames were obtained with a seeing of 0.7 arcsec and a projected pixel size of 0.069 arcsec. The plate solution has an rms position uncertainty of 0.3 arcsec and shows a R=19.4 +/- 0.1 star located at R.A. = 17h14m19s.68, decl = -34:02:46.5. The offset from the X-ray position is 0.8 +/- 0.7 arcsec; thus, the position of the optical source is consistent with the position for 2S 1711-339. Two unresolved stars located 1.4 +/- 0.7 arcsec SE from the Chandra position are probably not related to the X-ray source. | 2004-02-14 02:16:00 | optical,x-ray,binary,neutron star,star,transient | 2004-02-14 | 02:16:00 | 1,657 | [
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234 | Optical periodicity of microquasar candidate MCQC J162847-4152 | Michelle Buxton, Charles Bailyn (Yale U), Leonid Berdnikov (Sternberg Astronomical Institute, Moscow U), Gregory Tsarevsky (ATNF, Sydney, and ASC, Moscow) | We report on CCD photometry of the possible brightest microquasar MCQC J162847-4152 (ATEL #80). This object is coincident with the hard X-ray spectrum ROSAT source 1RXS J162848.1-415241 (ATEL #80), is a prominent radio transient (IAUC 8008 , 8275 ) and exhibits a K5 spectrum star with a strong and rapidly variable H-alpha emission (ATEL #80). Seventy five CCD observations made between 2003 June-October using the 1.3m CTIO telescope with ANDICAM showed a 4.835 +/- 0.001 d periodicity with amplitude 0.30 mag in V-band. In 2002 April a short set of photoelecric BVIc observations were obtained with 24" Siding Spring Observatory telescope. When folded on 2P = 9.870 d, the combined lightcurve exhibits an ellipsoidal-like shape with a slight asymmetry: the time taken from maximum to minimum is longer than from minimum to maximum. We urge observers to obtain radial velocity measurements to discern whether this object is a pulsating star or a binary system. If the latter, the radial velocity curve, combined with the photometric lightcurve, will allow us to estimate the mass of the unseen companion and resolve the question of whether or not this object is a microquasar. | 2004-02-14 02:44:00 | radio,optical,x-ray,binary,black hole,star,transient,variables | 2004-02-14 | 02:44:00 | 1,178 | [
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235 | A radio galaxy as possible counterpart of IGR J21247+5058 | M. Ribo (CEA Saclay, France), J. A. Combi (IAR, Argentina), I. F. Mirabel (CEA Saclay, France and IAFE-CONICET, Argentina) | Within the 2 arcmin-radius position error circle of the recently discovered INTEGRAL source IGR J21247+5058 (ATEL #229) is located the core of the bright radio source 4C 50.55 (also known as GPSR 93.319+0.394, KR2, NRAO 659 or BG 2122+50, among other names). The core has a flat radio spectrum with a peak flux density of 237 mJy/beam at 1.4 GHz. It is at the center of an elongated structure of 10 x 3 arcmin that ends in two large radio lobes that have peak flux densities of 288 mJy/beam (NW) and 92 mJy/beam (SE), and spectral indexes alpha~-0.6 (where S_nu is proportional to nu^+alpha), compatible with optically thin synchrotron radiation (see NVSS contour plot). The morphology of 4C 50.55 is typical of a radio galaxy, and the comparison among published radio data shows no significant changes in flux and morphology during the last 30 years. These properties are consistent with an extragalactic source, although, to our knowledge, no conclusive optical counterpart of a galaxy host has ever been reported, probably due to its location close to the Galactic plane (l=+93.32, b=+0.39).
The estimated J2000.0 ICRS position of the radio core from the NVSS map and data in the literature is RA=21h24m39.3s (+/-0.1s), DEC=+50d58'26" (+/-1"). Coincident with this position there is the IR source 2MASS 21243932+5058259 (see K-band 2MASS plot), with coordinates RA=21h24m39.32784s, DEC=+50d58'25.9284", and magnitudes J=13.27, H=12.38, K=11.37. The optical counterpart of this IR source has average magnitudes B=16.9 and R=15.1 in the USNO B1.0 catalog. The photometry of the IR/optical counterpart is not compatible with a stellar spectrum. There is no catalogued ROSAT or EGRET source coincident with IGR J21247+5058. Optical and X-ray observations are planned to confirm the extragalactic nature of the source and to study its spectrum in softer X-rays. | 2004-02-16 04:50:00 | radio,infra-red,optical,x-ray,gamma ray,agn,binary,black hole,quasar | 2004-02-16 | 04:50:00 | 1,860 | [
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] | 234 |
236 | Continued birghtening of GX 339-4 in X-rays | T. Belloni (INAF-OAB Merate), J. Homan (MIT), W. Cui (Purdue U.), J. Swank (NASA/GSFC) | A 4.4 ks observation of GX 339-4 with the Rossi X-ray Timing Explorer (RXTE) on Feb. 14 showed that the source is still brightening (see ATEL #231). The average net count rate in the Proportional Counter Array (PCA) was ~20 cts/s/unit (compared to ~1 cts/s/unit on Feb 1 and ~6 cts/s/unit on Feb 6), and varied between ~5 and ~60 cts/s/unit. The energy spectrum of the combined data from the PCA and the High-Energy X-ray Timing Experiment (HEXTE) can be approximated by a power law with photon index ~1.5. We measure an unabsorbed 3-100 keV flux of ~8e-10 ergs/cm^2/s. Timing analysis of the PCA data shows strong band-limited noise with a 0.001-10 Hz fractional rms of ~47% with a break frequency around 7 mHz. Observations at other wavelengths are encouraged. | 2004-02-17 06:54:00 | x-ray,binary,black hole,transient | 2004-02-17 | 06:54:00 | 762 | [
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] | 235 |
237 | Flux Transition in Terzan 2 | C. B. Markwardt (U. Maryland & GSFC), J. Swank (GSFC) | The bright X-ray source in Terzan 2 (possibly 4U 1724-307) has undergone a flux transition. In PCA monitoring observations of the galactic bulge, the flux of this source up to November 2003 had been a relatively steady at 20 mCrab. Monitoring observations on Feb 7.6, 10.8 and 14.9 show the flux increasing to levels of 34, 44 and 66 mCrab respectively (2-10 keV). In the time between November and February, pointing constraints prevented monitoring observations, but the current trend suggests a rapid and ongoing flux increase.
A 2.3 ks pointed PCA observation starting on Feb 16.14 confirmed the higher intensity. The X-ray spectrum is consistent with a cut-off power law, photon index 0.5, and a cut-off energy of 4 keV. The 2-10 and 2-30 keV fluxes were 1.6 and 2.1 10^{-9} erg/s/cm^2, respectively. The Fourier power density spectrum shows low frequency variability, plus a broad noise feature peaked at ~30 Hz.
We cannot exlude the possibility that another X-ray source in the Terzan 2 globular cluster has become active, however no other X-ray sources have been detected with Chandra (Revnivtsev et al 2002, Astron. Lett. 28, 237). | 2004-02-18 04:56:00 | x-ray,binary,globular cluster,neutron star,star,transient | 2004-02-18 | 04:56:00 | 1,141 | [
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238 | Correction to ATEL #233 (2S 1711-339) and addendum to ATEL #205 (A1744-36) | M. A.P. Torres (CfA), J. E. McClintock (CfA), M. R. Garcia (CfA), S. S. Murray (CfA) | 2S 1711-339: In ATEL #233 the absorbed X-ray flux of 2S 1711-339 was incorrectly given as 2e-15 ergs cm-2 s-1 (0.3-7.0 keV). The correct value obtained by using a blackbody model with kT = 0.24 +/- 0.03 keV or a neutron-star hydrogen-atmosphere model with kT = 0.07 +/- 0.03 keV is 1.0e-14 ergs cm-2 s-1 (0.5-10.0 keV). This flux is a factor of 10 below the limit on the quiescent absorbed flux obtained by Wilson et al. 2003, ApJ,596,1220. We thank R. Wijnands and J. Miller for alerting us to our error. A1744-36: In ATEL #205 we reported the X-ray position for a bright source (165 counts) which was outside the 40 arcsec error circle of the Ariel V position for A1744-36 (Bradt & McClintock 1983, ARA&A,21,13). From a further analysis of the Chandra ACIS-S observation we have discovered two very faint X-ray sources at R.A.= 17:48:14.47, DEC.= -36:08:13.6 (J2000; 7 counts) and R.A. = 17:48:13.13, DEC. = -36:07:58.17 (J2000; 13 counts) which are well within the Ariel V error circle. Adopting a positional uncertainty of 1 arcsec for these faint sources, the position of the latter X-ray source is consistent with the precise position of the radio source reported in ATEL #210. | 2004-02-19 02:50:00 | radio,optical,x-ray,binary,star,transient | 2004-02-19 | 02:50:00 | 1,183 | [
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239 | IGR J17418-1212 - A Possible Microquasar with Multiple Identification | Gregory Tsarevsky (Australia Telescope National Facility, Sydney & Astro Space Center, Moscow) | Due to Bassani et al., ATEL #232, the source No. 5 = IGR J17418-1212 (b = 9.4 deg.) was first detected in the hard X-ray band (>20 keV) by the IBIS/ISGRI instrument of INTEGRAL, and is probably identified with 2E1739.1-1210. I call attention that the INTEGRAL object coincides unambiguously with the bright ROSAT source 1RXS J174155.3-121157. Its hardness ratios (HR1 = 1.00 +/- 0.03; and HR2 = 0.48 +/- 0.09) place it well within the characteristic narrow strip occupied by XRBs in the 'two-colour' HR1 - HR2 diagram (Motch et al., A&AS, 132, 341, 1998). Such prominent behaviour, together with radio identification, has been chosen as the main selection criteria to find new microquasars in the relatively wide, |b| < 20 deg., belt along the whole Galactic plane (see Tsarevsky et al., ATEL #80, 2001, with references therein). So it actually is a microquasar candidate MCQC J1741-12 -- one of sixty in our survey list. Indeed, NVSS map showed a weak, S_1.4 = 3.5 mJy, unresolved radio source NVSS J174155-121201 17h41m55.55s -12o12'01.3" just 5.3 arcsec from the formal position of the ROSAT object, but with a total position error 6.6 arcsec, which is too large for reliable optical identification in the crowded Galactic plane. Nevertheless, the following tentative identifications have been found: | 2004-02-19 12:52:00 | radio,far-infra-red,infra-red,optical,x-ray,binary,black hole,neutron star,star,transient,request for observations | 2004-02-19 | 12:52:00 | 1,303 | [
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] | 238 |
240 | GX 339-4 detected with INTEGRAL | E. Kuulkers (ESA/ESTEC), A. Bodaghee (ISDC Geneva), L. Foschini (IASF/CNR Bologna), M. Guainazzi (ESA/Vilspa), G. Matt (Universiy of Roma), G. Israel (INAF - OA Roma), F. Nicastro (CfA), T. Oosterbroek (ESA/ESTEC), A. Parmar (ESA/ESTEC), J. Rodriguez (CEA/Saclay & ISDC Geneva), R. Walter (ISDC Geneva) | GX 339-4 was in the field of view during an observation of IGR J16318-4848 with INTEGRAL (UT 2004 Feb 18 03:41 - Feb 18 17:29). Further to the increase in activity reported in the optical/radio (ATel #230) and X-rays (ATel #231, #236), we report the detection of GX 339-4 with Jem-X and ISGRI/IBIS onboard INTEGRAL. Between 2004 Feb 18 03:41 - 10:09 (UT) the average observed fluxes were ~37 mCrab, ~46 mCrab, ~24 mCrab, and ~38 mCrab, in, respectively the 3-10 keV, 10-31 keV (Jem-X), 20-60 keV, and 60-200 keV (ISGRI/IBIS) energy bands. | 2004-02-19 14:30:00 | radio,optical,x-ray,gamma ray,binary,black hole,transient,variables | 2004-02-19 | 14:30:00 | 538 | [
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] | 239 |
241 | INTEGRAL confirms the brightening of 4U 1724-307 | A. Bodaghee (ISDC, Geneva); Niels-Joergen Westergaard (DSRI, Copenhagen); F. Capitano (IASF, Roma); B. McBreen (UC Dublin); J-P Roques (CESR, Toulouse); E. Kuulkers (ESTEC, Noordwijk); S. Molkov (IKI, Moscow); G. G. C. Palumbo (Universita di Bologna) | During an observation of the Galactic Center Deep Exposure performed between February 17 (07:03 UTC) and February 18 (00:01 UTC), JEM-X on board INTEGRAL detected a bright source at position (J2000) RA=17:27:34 DEC=-30:47.9 (1 arcmin uncertainty) corresponding to 4U 1724-307. The source varies between 50 and 100 mCrab on time scales of hours in both the 3-10 and 10-30 keV bands. Between 3 and 20 keV the photon index is 2.7+/-0.4 and the flux is F(3-20)=8E-10 erg/s/cm2. This confirms the report by Markwardt et al (ATEL#237). | 2004-02-19 17:40:00 | x-ray,gamma ray,binary,neutron star,star,transient | 2004-02-19 | 17:40:00 | 529 | [
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] | 240 |
242 | Radio flare in Cygnus X-1 | Guy Pooley (Cavendish Lab, Cambridge UK) | A major and extremely unusual flare in the radio emission from Cygnus X-1 has been detected. The observation at 15 GHz with the Ryle Telescope in Cambridge (UK) started on 2004 Feb 20 at UT 06h15m. The initial flux denstiy was 60 mJy, and rose to 140 mJy in < 30 min, followed by a rapid decline. After about 2 h the flux density returned to its 'quiescent' range of 10 - 15 mJy for the remaining 7 hours of observing. A plot of the data, with nominal 32-second integrations, is available at http://www.mrao.cam.ac.uk/~guy/cx1/040220.ps | 2004-02-21 16:41:00 | radio,infra-red,optical,x-ray,black hole,transient,request for observations | 2004-02-21 | 16:41:00 | 536 | [
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] | 241 |
243 | IR-brightening of GX339-4 | G. L. Israel (INAF OA Roma), S. Covino (INAF OA Brera), Erik Kuulkers (ESA/ESTEC), and F. M.Zerbi, G. Chincarini, M. Rodono', L. A. Antonelli, P. Conconi, G. Cutispoto, E. Molinari, L. Nicastro, G. Tosti, L. Burderi, S. Campana, C. Campeggi, G. Crimi, R. Cunniffe, J. Danzinger, A. Di Paola, A. Fernandez-Soto, F. Fiore, F. Frontera, D. Fugazza, G. Gentile, G. Ghisellini, P. Goldoni, B. Jordan, D. Lazzati, D. Lorenzetti, D. Malesani, E. Martinetti, N. Masetti, R. Mazzoleni, B. Mc Breen, A. Melandri, S. Messina, E. Meurs, A. Monfardini, G. Nucciarelli, M. Orlandini, J. Paul, E. Palazzi, E. Pian, P. Saracco, S. Sardone, A. Simoncelli, M. Stefanon, L. Stella, L. Tagliaferri, M. Tavani, V. Testa, S. Vergani, F. Vitali (REM Team) | We report on IR observations obtained during the scientific verification phase of REMIR (field of view of 11'x11' and a pixel size of 1") mounted on the Nasmith focus of REM, the 60-cm robotic telescope located at the La Silla Observatory, Chile. Several images of the field including the position of the black hole candidate GX339-4 have been obtained on 19th February 2004 in the J, H, and K bands with an effective exposure time of 300s each.
The IR counterpart of this binary system was found in a bright state when compared with the 2MASS images and catalogue, and with values reported in literature, see Chaty et al. 2002, MNRAS, 331, 1065 and reference therein, confirming that the energy spectrum of GX339-4 is indeed changing from radio up to 200KeV (see also ATEL #230, #231, #236 and #240). A preliminary photometric analysis gives the following magnitudes: J=13.6, H=12.4 and K=12.8 (at this stage uncertainties are of the order of 0.3 magnitudes). As a comparison the magnitudes reported in the 2MASS catalogue are: J=15.91, H=15.40, K=14.97 (uncertainty of about 0.15 magnitudes). | 2004-02-24 04:47:00 | radio,infra-red,x-ray,binary,black hole,transient,variables | 2004-02-24 | 04:47:00 | 1,095 | [
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] | 242 |
244 | R-band Observations of 2S 1711-339 in 1998 During Outburst | John A. Tomsick (UC San Diego) | In 1998 August, we obtained optical observations of the field containing the recurrent transient and type I X-ray burster 2S 1711-339 with the CTIO 0.9 meter telescope in an attempt to identify its optical counterpart. Our observations occurred during the only bright X-ray outburst of the past 8 years as determined by an inspection of the Rossi X-ray Timing Explorer All-Sky Monitor light curve. Prior to and at the time of our optical observations, the 1.5-12 keV flux was in the 25-55 mCrab range (Remillard et al. 1998, IAUC 6983 ). More recently, Wilson et al. (2003) reported a sub-arcsecond accuracy X-ray (Chandra) position, and Torres et al. (2004, ATEL#233) suggested a possible quiescent optical counterpart with R = 19.4 +/- 0.1. During UT 1998 August 5.99-6.05, we took six 10 minute R-band exposures. The CCD pixel size was 0".768, and the seeing was 1".5. We detect three blended sources within 4" of the Chandra position. Only one of these sources has a position consistent with the optical counterpart suggested by Torres et al., and we estimate that its R-band magnitude is 19.4 with a preliminary uncertainty of +/- 0.2 magnitudes. For the two nearby sources, one is similar in brightness, and one is about 0.5 magnitudes fainter. If the candidate counterpart suggested by Torres et al. is, in fact, 2S 1711-339, then our results indicate that the optical flux does not increase during X-ray outbursts, and such behavior could be indicative of a High Mass X-ray Binary (HMXB) system. However, type I X-ray bursts are not typical of HMXBs. Another possibility is that we and also Torres et al. did not detect the 2S 1711-339 counterpart due to the relatively high level of extinction for this source. | 2004-02-28 06:55:00 | optical,x-ray,binary,neutron star,star,transient | 2004-02-28 | 06:55:00 | 1,719 | [
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245 | Optical Brightening of Be/X-ray Binary BQ Cam/V0332+53. | Vitaly Goranskij (Sternberg Astronomical Institute, Moscow University), Elena Barsukova (Special Astrophysical Observatory, Russian Academy of Sciences) | BQ Cam is an optical counterpart of X-ray transient V0332+53. The system consists of a Be star and a neutron star. Recently, it has undergone rapid brightening after 9.3 years of quiescence, and has reached its brightness maximum V=15.19 on 2004 January 31. Our photometric CCD monitoring made with SAI 60-cm and SAO 100-cm reflectors shows that the continuous rise to maximum began in January, 2002 at V=15.66. The historical light curve taken since its optical identification in 1983 (Goranskij, Astron. Letters, V.27, 516, 2001) shows two similar brightenings in 1983 and 1989, both accompanied with short-lived X-ray outbursts. The total range of variability for 20 years of our monitoring is 15.2-15.9 V. The rate of the latest brightening approaches that of the 1988-1989 outburst. One more historical X-ray outburst was registered by Vela 5B in 1973, but the source was not identified with an optical star that time. The previous optical high states lasted 1-2 years. So, in the near future within 1-2 years one can wait for a new X-ray outburst of BQ Cam. | 2004-03-05 21:08:00 | optical,x-ray,binary,neutron star,star,transient | 2004-03-05 | 21:08:00 | 1,063 | [
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] | 244 |
246 | Possible radio, IR and soft X-ray counterpart of IGR J18027-1455 | J. A. Combi (IAR, Argentina), M. Ribo (CEA Saclay, France), I. F. Mirabel | Within the 2 arcminute-radius position error circle of the recently discovered INTEGRAL source IGR J18027-1455 (ATEL #229), we have found two weak radio sources in the 1.4 GHz NVSS maps. The first one, NVSS J180239-145453, has an estimated J2000.0 ICRS position of RA=18h02m39.94s (+/-0.25s), DEC=-14d54'53.6" (+/-3.3") (1 sigma uncertainties), has a flux density of 6.9 mJy and has no IR counterpart in 2MASS (see Ks-band 2MASS plot, where position error ellipses represent 2 sigma uncertainties). The second one, NVSS J180247-145451, has an estimated J2000.0 ICRS position of RA=18h02m47.37s (+/-0.13s), DEC=-14d54'51.6" (+/-2.2"), has a flux density of 10.5 mJy, and lies inside the 2 sigma position error circle of the faint ROSAT X-ray source 1RXS J180245.5-145432, which is well within the IBIS/ISGRI error circle. Inside the 2 sigma position error ellipse of this radio source is located an extended IR source, 2MASXi J1802473-145454, with coordinates RA=18h02m47.3s, DEC=-14d54'55" and magnitudes J=13.18, H=12.02, Ks=10.94. The optical counterpart of this IR source has average magnitudes B=19.3, R=14.9 and I=13.8 in the USNO-B1.0 catalog. The photometry of the IR/optical counterpart is not compatible with a stellar spectrum.
We suggest that the sources NVSS J180247-145451, 2MASXi J1802473-145454 and 1RXS J180245.5-145432 are the possible counterparts of IGR J18027-1455. There is no catalogued EGRET source coincident with IGR J18027-1455. Multiwavelength observations are planned to unveil the nature of this high-energy source. | 2004-03-06 23:19:00 | radio,infra-red,optical,x-ray,gamma ray,agn,binary,black hole,neutron star,quasar,star | 2004-03-06 | 23:19:00 | 1,545 | [
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] | 245 |
247 | The Black Hole Candidate 4U 1630-47 in the Midst of a Transition to the Hard State | J. A. Tomsick | Monitoring observations by the Rossi X-ray Timing Explorer indicate that the recurrent black hole candidate X-ray transient 4U 1630-47 is undergoing a transition to the Hard state. The energy spectrum, which is well-described by the canonical disk-blackbody plus power-law model (along with interstellar absorption and an iron absorption edge), has been evolving over the past few weeks with the most significant evolution being a gradual drop in the inner disk temperature from about 1 keV to 0.49 +/- 0.03 keV during the most recent observation on UT 2004 March 7. The power-law photon index has also hardened and has been between 1.9 and 2.0 during four observations over the past 5 days (March 2-7). The 3-25 keV absorbed flux was 6.5 x 10^-10 erg/cm2/s on March 7, and this is close to the flux where transitions to the Hard state have been seen during previous 4U 1630-47 outbursts. The source also showed a significant increase in the level of timing noise (to 10-15% rms) over the past 5 days, and the power spectrum shows strong, 6-10% rms, QPOs at 4-6 Hz. Although 4U 1630-47 has been in outburst for the past 1.5 years, these are the first indications of Hard state activity during this outburst. Hard state activity in other black hole sources is often accompanied by an increase in IR and radio flux, and multi-wavelength observations are encouraged. IR observations would be especially useful as they could lead to a confirmation of the probable IR counterpart suggested by Augusteijn et al. (2001, A&A, 375, 447). RXTE monitoring will continue. | 2004-03-08 14:10:00 | radio,x-ray,black hole,transient,request for observations | 2004-03-08 | 14:10:00 | 1,559 | [
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248 | The LMXRB GX354-0 is flaring in the hard X-rays | Juan Zurita (ISDC Geneva), Angela Bazzano (IASF Roma), Soren Brandt (DSRI Copenhagen), Albert Domingo (LAEFF Madrid), Christoph Winkler (ESA/ESTEC Noordwijk), Serguei Grebenev (IKI Moscow) | GX 354-0 (also known as 4U 1728-34) has been monitored by INTEGRAL as part of the Galactic Center Deep Exposure almost continuously from 2004-02-16 until now. Over that period the source flux measured by IBIS/ISGRI between 20-60 keV featured a smooth increase with a maximum flux of 0.2 Crab measured on February 24th. The source flux then decreased by a factor of 5 on a time scale of one week. Below 10 keV the flux measured by JEM-X increased by a factor larger than 6 continuously on a timescale of 3 weeks. The current flux (2004-03-08) measured by JEM-X in the 3-10 keV band is 0.5 Crab. The INTEGRAL monitoring will continue for several days. | 2004-03-09 20:23:00 | x-ray,gamma ray,binary,neutron star,star,transient | 2004-03-09 | 20:23:00 | 649 | [
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249 | Discovery of PSR 1259-63 in VHE Gamma-Rays with H.E.S.S. | M. Beilicke, Universitaet Hamburg; M. Ouchrif, Laboratoire de Physique Nucleaire de Haute Energie, Universite Paris VI and VII; G. Rowell, Max-Planck-Institut fuer Kernphysik; and S. Schlenker, Humboldt-Universitaet, Berlin; on behalf of the H. E.S. S. (High Energy Stereoscopic System) Collaboration | We report detection of very-high-energy gamma-ray emission from the binary millisecond pulsar PSR 1259-63 (1236.72-day orbit) by the H.E.S.S. experiment above a threshold of about 200 GeV (in the observed zenith-angle range, 40o-45o) at the 5.9-sigma level, where previously upper limits were reported by the CANGAROO collaboration (Kawachi et al. 2004, Ap.J., in press). The source was observed for a total of 4.6 hr live-time between Feb. 26 and Mar. 5 with the full four-telescope Cherenkov array. Preliminary estimates yield a flux at about 10 percent of the level of the Crab nebula (0.4 photons/min gamma-ray excess detected after selection cuts). Periastron passage of the pulsar was expected on Mar. 7.43 UT.
Observations at other wavelengths are strongly encouraged, especially on Mar. 20-25, when the neutron star will cross the inclined Be disk for the second time. Observations with H.E.S.S. are scheduled to recommence on Mar. 14, after the bright-moon period. Particle acceleration associated with the pulsar wind is predicted to result in observable GeV/TeV emission also after periastron (Kirk et al. 1999, Astroparticle Phys. 10, 31). | 2004-03-12 15:32:00 | gamma ray,tev,vhe,binary,neutron star,pulsar,star,request for observations | 2004-03-12 | 15:32:00 | 1,152 | [
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] | 248 |
250 | Planned Observation Schedule on PSR 1259-63 by the H.E.S.S. experiment in March, 2004 | M. Beilicke, Universitaet Hamburg; M. Ouchrif, Laboratoire de Physique Nucleaire de Haute Energie, Universite Paris VI and VII; G. Rowell, Max-Planck-Institut fuer Kernphysik; and S. Schlenker, Humboldt-Universitaet, Berlin; on behalf of the H. E.S. S. (High Energy Stereoscopic System) Collaboration | Further to our preceding telegram (ATEL #249) on the discovery of very-high-energy gamma-ray emission from the binary millisecond pulsar PSR 1259-63 by the H.E.S.S. experiment above a threshold of about 200 GeV, we present here our planned programme for observations for March, 2004, in order to facilitate simultaneous observations. Periastron passage of the pulsar was expected on Mar. 7.43 UT, and the pulsar is now leaving periastron. It will traverse the the inclined Be disk for the second time on Mar. 20-25, and phenomona on time-scales of hours or days may be expected preceding and during this phase. Simultaneous or quasi-simultaneous observations in other wavelengths are important for understanding of the source. The next periastron passage will not take place for another 3.4 years.
Our planned observing schedule on this source in the coming days is:
These nights' times may be modified to begin 0.1 day earlier if the preliminary analysis of the preceding nights' data shows a high flaring state.
Observations on subsequent nights will be determined by the preliminary results of the preceding nights of this period, and may be the object of a further follow-up telegram. Observations in this dark-moon period may continue up to Mar. 27 (as a multiwavelength campaign on another source will preclude further observations).
An INTEGRAL Target of Opportunity observation has been obtained on this source. Observations in other wavelengths (radio, X-ray) are strongly encouraged. | 2004-03-14 02:28:00 | radio,x-ray,gamma ray,binary,pulsar,request for observations | 2004-03-14 | 02:28:00 | 1,497 | [
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251 | Transition to a hard state of 1RXP J130159.6-635806 | M. Chernyakova (ISDC, Geneva), P. Shtykovsky (IKI, Moscow), A. Lutovinov (IKI, Moscow), M. Revnivtsev (IKI, Moscow/MPA, Garching), T. Courvoisier (ISDC, Geneva), R. Walter (ISDC, Geneva), S. Shaw (ISDC, Geneva), G. Cocco (CNR, Bologna), D. Attie (CEA/Saclay), C. Budtz-Jorgensen (DSRI, Copenhagen), W. Hermsen (SRON, Utrecht), R. Much (ESTEC, Noordwijk) | We report a detection of a transition to a hard state during the possible outburst of a ROSAT source 1RXP J130159.6-635806, located approximately 10 arc minutes from PSR 1259-63. Source was observed with XMM-Newton observatory on 29 January 2004. In the 1-10 keV energy band its intensity (~1.4E-10 ergs/cm2/s ) was found to be approximately order of magnitude higher than was observed with ASCA on Aug.13, 1995. The source spectrum in the 0.5-10 keV energy band can be described by a simple powerlaw with photon index ~0.5 and interstellar absorption ~2.E22 cm^{-2}. Comparison with ASCA results (photon index ~2.5) have shown that the source spectrum is now much harder with approximately the same value of the absorption. This fact points probably on a transition to the hard state. Several days later, on 7 February 2004, the source was observed with the INTEGRAL observatory during the routine galactic plane scan. The source was detected in the 18-60 keV energy band with intensity of 11 mCrab. Note that it was a first detection of this source in hard energies, that supports an assumption of the transition to a hard state. In the next INTEGRAL observation of this region on 19 February 2004 the source was no longer detected at a significant level. | 2004-03-14 19:22:00 | x-ray,transient | 2004-03-14 | 19:22:00 | 1,257 | [
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252 | New outburst of IGR J17544-2619 detected with INTEGRAL | S. A.Grebenev (IKI, Moscow), J. Rodriguez (CEA, Saclay & ISDC, Versoix), N. J.Westergaard (DSRI, Copenhagen), R. A.Sunyaev (IKI, Moscow & MPA, Garching), T. Oosterbroek (ESA/ESTEC, Noordwijk) | A new outburst of the hard X-ray transient IGR J17544-2619 (ATEL #190, #192, #194, IAUC # 8202 ) was detected with INTEGRAL during recent observations dedicated to the Galactic Center Deep Exposure. The source was first detected with IBIS/ISGRI on March 8, 2004 at 08h UTC and remained bright during at least 10 hours. The S/N ratio was equal to 33. The average 17-45 keV flux was about 50 mCrab but the source reached ~160 mCrab at the peak of the outburst (at 11h UTC). The source was very variable with an oscillation-like behaviour on a time scale of 1.5-2 hours. The source spectrum was rather steep. It could be described by a power law with the photon index of about -4 with some evidence for a high energy cutoff. The source was also detected with JEM-X in the 6-30 keV band but only during the short time interval (~25 min) corresponding to the maximum of its hard X-ray brightness. The S/N ratio was ~18. The spectrum was slightly flatter than that in the ISGRI band and could be described with the photon index of about -3. This observation shows that the outburst in September when the source was discovered (ATEL #190, #192) was not an unique event and IGR J17544-2619 is actually a recurrent transient. We encourage persistent monitoring of this source at all wavelengths. | 2004-03-19 01:52:00 | radio,infra-red,optical,x-ray,binary,black hole,neutron star,star,transient,variables | 2004-03-19 | 01:52:00 | 1,286 | [
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253 | Chandra observations of IGR J16316-4028 | J. Rodriguez (CEA/SAp, France & ISDC Switzerland), L. Foschini (IASF, Italy), A. Goldwurm (CEA), V. Beckmann (GSFC, USA), K. Ebisawa (GSFC & ISDC) | We report on a Chandra Director Discretionary Time observation of the region around IGR J16316-4028 (see Rodriguez and Goldwurm Atel #201) performed on January 18, 2004, 13:01 UT. The analysis of HRC-I data did not reveal any significant (> 3sigma) excess in the field of view (30" X 30"), with an upper limit in flux of 5 10-14 erg.cm-2.s-1 in the 0.5-10 keV energy range.
We further report on the spectral analysis of the INTEGRAL/IBIS observation performed on February 28, 2003. The source had a power law like spectrum of photon index 2.7 (+0.2 -0.3 at 3 sigma) and an average 20-100 keV flux of 1.2 10-10 ergs.cm-2.s-1. This suggests that IGR J16316-4028 was flaring at the time of its discovery (extrapolated 0.5-10 keV flux of 2.3 10-9 ergs.cm-2.s-1), and was in quiescence during the Chandra observation. The planned scans of this sky region with INTEGRAL will possibly allow the source to be detected during future outburst/flares. The authors are grateful to H. Tananbaum for the generous and prompt allocation of DDT and to the CXC for the rapid data processing and delivery. | 2004-03-19 21:34:00 | x-ray,gamma ray,binary,black hole,neutron star,nova,pulsar,star,transient,request for observations | 2004-03-19 | 21:34:00 | 1,087 | [
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254 | New X-ray outburst in 4U 1608-52 | Ron Remillard (MIT) and Jon Miller (Harvard-Smithsonian CfA) | The RXTE All-Sky Monitor has detected a new outburst in 4U 1608-52, a neutron-star binary that emits type 1 X-ray bursts. The flux increased from an upper limit of 10 mCrab (3 sigma; 1.5-12 keV), averaged over 2004 March 1-12, to 125 mCrab on March 16, and to 250 mCrab on March 18. Thus far on March 19, the source is holding roughly steady near 250 mCrab. This is the eighth time that 4U 1608-52 has surpassed 200 mCrab since Jan 1996. | 2004-03-19 22:32:00 | x-ray,binary,star,transient | 2004-03-19 | 22:32:00 | 437 | [
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] | 253 |
255 | RXTE PCA Detections of Transient Activity of X-ray Bursters in the Galactic Center Region | C. B. Markwardt (U. Maryland & NASA/GSFC), J. H. Swank (NASA/GSFC) | This report is a summary of recent transient activity in the galactic center region, as measured by scanning observations by the RXTE PCA instrument. The specific sources are: SAX J1747.0-2853, GRS 1747-312, RX J170930.2-263927, 4U 1711-34 (= 2S 1711-339), and 4U 1728-34 (= GX 354-0).
SAX J1747.0-2853 was detected in outburst on 19.81 Mar 2004 (MJD 53083.81). The previous outburst was seen in September 2001, although it is debatable whether this source entered true "quiescence" or maintained a low level of activity. The current flux (220 mCrab) is the highest seen since the bulge scans started in Feb 1999.
The bursting and eclipsing source GRS 1747-312 in the globular cluster Terzan 6 has entered one of its quasi-regular outbursts. The flux has risen from 9 mCrab on Mar 13.01 to 32 mCrab on Mar 19.77 (MJD 53077.01 to 53083.77). Based on previous experience, this outburst should last 3-4 weeks. The apparent peak flux for this outburst is typical.
The X-ray burster RX J170930.2-263927, in the globular cluster Terzan 5, has entered into an outburst starting before Mar 6 (MJD 53070). The flux has steadily increased from 6 mCrab, as measured on that date, to 32 mCrab on Mar 19.83 (MJD 53083.83). The previous outburst of this source was in Feb 2002, suggesting a mean recurrence period of 2-3 years.
The position of the potential quiescent counterpart to 4U 1711-34 (= 2S 1711-339) has recently been reported by Torres et al. in X-rays (ATEL #233, ATEL #238) and in R-band (Tomsick, ATEL #244). We can report that this source has recently undergone a brief outburst (2.5 weeks duration). Since this source is at the edge of the PCA scanning region, the X-ray flux precision depends on the scanning direction, which alternates every ~3.5 days. We estimate that the peak flux was between 13-29 mCrab between Mar 3-6 (MJD 53067-53070).
We confirm the recent transient increase of 4U 1728-34 (= GX354-0) as reported by Zurita et al. (ATEL #248). The source reached a peak flux of 385 mCrab on Mar 10.04 (MJD 53074.04), and has since declined to a flux of 120 mCrab on Mar 19.76 (MJD 53083.76), which is now within the typical range for this source since the start of monitoring by the PCA in 1999. | 2004-03-20 10:16:00 | x-ray,binary,globular cluster,neutron star,star,transient | 2004-03-20 | 10:16:00 | 2,212 | [
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] | 254 |
256 | INTEGRAL detection of the X-ray outburst of SAX J1747.0-2853 | S. Deluit (ISDC, Geneva), A. Bazzano (IASF, Roma), N. Mowlavi (ISDC, Geneva), S. Grebenev (IKI, Moscow), J-P Roques (CESR, Toulouse), V. Schoenfelder (MPE, Garching), G. Palumbo (Universita di Bologna), S. Brandt (DSRI) | We report the detection with INTEGRAL of a new outburst of the recurrent BeppoSAX hard X-ray transient SAX J1747.0-2853, an emitting type I X-ray bursts neutron star binary.
The source was detected at RA=266.76 DEC=-28.89 (J2000), 30 arcsec precision, for a total exposure of 13880 s between March 20 18:16:57 and March 21 15:12:33 as part of the Galactic Center Deep Exposure. The source was detected with a flux of 240 mCrab in the 3-10 keV band of JEMX1 and up to 92 mCrab in the 10-30 keV band. We confirm thus the RXTE/PCA detection reported by Markwardt et al. in ATEL #255.
In addition, we report a detection of only 8.5 mCrab in the 17-45 keV band in ISGRI, which, combined with the low flux in the 10-30 keV of JEMX indicates the source being in high state with softness in the emission. The source had not been detected so far during any of the previous core program observation of INTEGRAL with the source in the field of view. Last outburst was in 2001 september and the source has never been detected brighter than 100 mCrab with BeppoSAX. | 2004-03-24 19:54:00 | x-ray,binary,neutron star,star,transient | 2004-03-24 | 19:54:00 | 1,054 | [
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257 | 1E1740.7-2942 and KS1741-293 | S. A.Grebenev (IKI, Moscow), M. G.Revnivtsev (IKI, Moscow & MPA, Garching), R. A.Sunyaev (IKI, Moscow & MPA, Garching) | 1E1740.7-2942, one of the most peculiar persistent hard X-/gamma-ray sources in the Galaxy, a black-hole candidate and a microquasar, was not detected with INTEGRAL during deep Open Program observations of the Galactic center field carried out on March 12-16, 2004. The 3-sigma upper limits for the flux were 1.7 mCrab and 3.1 mCrab in the 17-40 and 40-100 keV, respectively, indicating that the flux dropped at least 20-30 times of its usual level. Such behaviour is similar to the remarkable ``long-term switch-off'' of the source in 1991-1992. The switch-off gives us a unique chance for studying this source in quiescence. We encourage observations of the source in IR and radio bands, as well as in soft X-rays (to check the possibility of the transition to the soft spectral state). The only hard X-ray source in the few-degrees neighbornhood of Sgr A* remains currently the burster KS1741-293 which demonstrates the hard Crab-like spectrum extended to at least 100 keV. | 2004-03-25 01:46:00 | radio,x-ray,gamma ray,black hole,request for observations | 2004-03-25 | 01:46:00 | 976 | [
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258 | RXTE Detection of 1E 1740.7-2942 | C. B. Markwardt (U. Maryland & NASA/GSFC), D. M. Smith and N. Bezayiff (U. C. Santa Cruz), J. H. Swank (NASA/GSFC), W. A. Heindl (U. C. San Diego) | Grebenev, Revnivtsev and Sunyaev discuss the recent non-detection by INTEGRAL of 1E 1740.7-2942 (ATEL #257). This source is regularly monitored by RXTE PCA scanning observations and direct pointings, which each occur twice weekly.
In the 2-10 keV band the source has a typical flux of about 25 mCrab. However, in the past half a year, the flux has declined to about 9 mCrab, but is still strongly detectable.
The current spectrum is consistent with the soft state, and not the hard state, of black-hole binaries. In 2002, 1E 1740.7-2942 had another soft X-ray low state, where the X-ray flux dipped by a similar amount (ATEL #94). Thus, such transitions may be more common than previously thought. An even more dramatic transition was observed in 2001 from the very similar system GRS 1758-258 (ATEL #66). | 2004-03-25 12:35:00 | x-ray,binary,black hole,transient,a comment | 2004-03-25 | 12:35:00 | 807 | [
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] | 257 |
259 | Detection of Aql X-1 in Hard X-Ray State | S. V. Molkov, A. A. Lutovinov (IKI, Moscow), A. M. Cherepashchuk (SAI, Moscow), R. A. Sunyaev (IKI, Moscow; MPA Garching) | We report a detection of Aql X-1 in the unusual hard spectral state. The source was significantly detected up to 150 keV with INTEGRAL on 24-25 March, 2004 during the Sagitarius Arm Tangent observations. Its spectrum can be described by a simple powerlaw with the photon index of ~2.1 and flux of ~35 mCrab in both 18-60 and 60-120 keV energy bands. We encourage the follow-up observations in different wavelengths. | 2004-03-27 05:10:00 | x-ray,gamma ray,binary,neutron star,star,transient,request for observations | 2004-03-27 | 05:10:00 | 415 | [
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] | 258 |
260 | Aquila X-1 optical outburst in progress | S. A.Ilovaisky and C. Chevalier (OHP) | The optical counterpart of the recurrent X-ray transient Aquila X-1 has been observed since mid-March 2004 with the Haute-Provence 1.2-m telescope and CCD camera to be in an intermediate brightness state near V = 17.5. The current low soft X-ray (2-10 keV) flux, as detected from this source by the Rossi/XTE ASM since early February (obtained from publicly available data), yields a high Optical/Soft X-ray flux ratio nearly identical with that observed during the rare 1996 "mini-outburst" event. | 2004-03-27 08:10:00 | optical,x-ray,binary,neutron star,star,transient | 2004-03-27 | 08:10:00 | 498 | [
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] | 259 |
261 | IGR J07597-3842 - A new INTEGRAL source with candidate counterparts in the radio, IR and X-ray bands | P. R. den Hartog, W. Hermsen, L. M. Kuiper, J. J.M. in 't Zand (SRON Utrecht), C. Winkler (ESA/ESTEC Noordwijk), A. Domingo (LAEFF Madrid) | We report the detection of a new hard X-ray source in 2.2 Msec of exposure on the Vela region as accumulated by INTEGRAL during June/July and November/December 2003. The position is R.A. = 7h 59m 43.5s, Decl. = -38o 42' 36s (Eq. J2000) with an error of 2'. It was detected at a 12-sigma significance level with the INTEGRAL IBIS/ISGRI detector in the 20-60 keV energy band. The source spectrum can be described by a simple power law with photon index 1.8+/-0.3 (Red. Chi^2 = 0.9, 6 dof) and flux 2.4 mcrab.
Archival searches/analyses provided possible counterparts at different wavelengths. The ROSAT source RXH J075942.0-384355 at the position R.A. = 07h 59m 42.0s ,Decl. = -38o 43' 56.0" (systematic error 6") is 1.4' from the INTEGRAL centroid position. The flux between 0.1 and 2.4 keV is 1.35 E-11 erg s-1 cm-2. Consistent with the ROSAT position we found a 1.4-GHz radio counterpart (R.A. = 07h 59m 41.8s; Decl. = -38o 43' 53"; 5" error) in the NVSS archive with a peak flux of 3.8 mJy, and an IRAS point source, IRAS 07579-3835, of 2.4e-1 Jy at 25 microns. Another ROSAT source, RXH J075959.2-384102, located 3.4' from the INTEGRAL position, is a less likely candidate counterpart.
The BeppoSAX Wide Field Cameras serendipitously observed the field around IGR J07594-3843 during roughly 250 observations over its 1996-2002 operational life. The total net exposure time is 3.5 Msec. The exposure per half year up to 2001 varies between 80 (2nd half 2001) and 900 ksec (second half 1996). Never was a source detected in a single observation, with upper limits ranging mostly between roughly 7 and 70 mCrab, nor in accumulations over half a year, with upper limits ranging between 1.0 and 3 mCrab (2-28 keV). However, a 7 sigma detection was obtained when combining all data, with a flux in the 2-9 keV band of 1.0 mCrab. The source position R.A.= 07h 59m 42.8s Decl. = -38o 43' 54s (3.6' at 99% confidence) is 0.2' from RXH J075942.0-384355 and 3.4' from RXH J075959.2-384102.
Both, the ROSAT and BeppoSAX-WFC flux values are within the errors consistent with the extrapolation of the power-law spectrum fitted to the INTEGRAL data points.
The nature of IGR J07597-3842 is unclear. The radio and IR candidate counterparts suggest an AGN, but a Galactic origin cannot be ruled out. | 2004-03-29 21:36:00 | radio,infra-red,x-ray,gamma ray,agn | 2004-03-29 | 21:36:00 | 2,289 | [
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] | 260 |
262 | Optical counterpart of XTE J1709-267 | P. G. Jonker (CfA), M. Buxton (Yale), J. E. McClintock (CfA) | We have discovered the optical counterpart to the recurrent neutron star soft X-ray transient XTE J1709-267 (see ATEL #255) in a 900 s R band image obtained with ANDICAM mounted on the 1.3 m telescope at CTIO on March 26, 2004. The proposed counterpart coincides with the accurate position obtained from a Chandra observation. It was not detected on a previous R band image with a limiting magnitude of ~20.5 obtained with the 2.5 m INT when the source was in quiescence (see Jonker et al. 2003). The night was photometric and the R band magnitude of the counterpart was found to be 20.15+-0.04. From Magellan images obtained on June 1, 2003, when the source was in quescence, we find that the counterpart in the 1.3 m images is blended with a faint nearby (~0.7", R=21.56) background star. A finder chart showing the source during outburst and the faint nearby star can be found at http://www-xray.ast.cam.ac.uk/~peterj/Finder.1709.Outburst.ps | 2004-04-01 04:28:00 | optical,x-ray,binary,neutron star,star,transient | 2004-04-01 | 04:28:00 | 944 | [
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263 | A possible near-infrared/optical counterpart to the new ISGRI source IGR J07597-3842 | M. Molina (Universià degli Studi di Bologna), L. Bassani, A. Malizia, J. B. Stephen (IASF/CNR Bologna), A. Bazzano (IASF/CNR Roma) | We report the presence of a near infrared counterpart (2MASS and DENIS ) in the error box of the Rosat source RXH J075942.0-384359, likely to be associated to the new ISGRI source IGR J07597-3842 located in the Vela region (Atel 261). The 2 MASS object (see K-band image where position and associated uncertainty of the Rosat, IRAS and radio sources are overlaid) is located at R.A. = 07h 59m 41.82s and Decl. = -38o 43' 56" and has magnitudes J=13.560, H=12.465 and K=11.345; this source is also reported in the DENIS catalogue (J075941.8-384356) with similar J and K magnitudes and with I=15.026-15.114, R=14.2 and B=16.6 magnitudes respectively. It is clear from the near-image that the radio, far and near IR as well as the soft X-ray source are the same object. Near-infrared photometry is compatible with an AGN nature for this source. | 2004-04-01 20:17:00 | radio,infra-red,optical,x-ray,gamma ray,agn | 2004-04-01 | 20:17:00 | 841 | [
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264 | IGR J17418-12122 - USNO 0778-0495204 is an AGN. | M. A.P. Torres (CfA), M. R. Garcia (CfA), J. E. McClintock (CfA), D. Steeghs (CfA), J. Miller (CfA), P. J. Callanan (University College, Cork), P. Zhao (CfA), P. Berlind (CfA) | The INTEGRAL/EINSTEIN/ROSAT/NVSS objects IGR J17418-12122, 2E 1739.1-1210, 1RXS J174155.3-121157 and NVSS J174155-121201 have recently been suggested to be the same and considered to be a microquasar candidate with likely counterparts at optical and IR wavelengths (Tsarevsky et al. 2004, ATEL #239; Bassani et al. 2004, ATEL #232). In order to establish the identity of these sources, a 10-min spectrum of the tentative optical counterpart USNO 0778-0495204 was acquired on March 26.5 2004 (UT) with the FAST spectrograph attached to the 1.5-m telescope at the F. L. Whipple Observatory. The resulting spectrum is dominated by strong redshifted and blended emission lines at Halpha and N[II] 6548,6583. Also evident are Hbeta, [OIII] 4959,5007, HeI 5876 and [S II] 6716,6731. The spectrum is highly reminiscent of a Seyfert 1 galaxy given the large broadening of the hydrogen lines compared to the forbidden lines and the likely presence of weak FeII emission bands. The Halpha + N[II] profile has a FWZI of 12000 km/s and presents a red asymmetry partially caused by the unresolved telluric oxygen B bands at ~6870-6920. Using the narrow emission lines only, the redshift is estimated to be z=0.0372 +/- 0.0001. If we assume that USNO 0778-0495204 is the optical counterpart to 1RXS J174155.3-121157 and 2E 1739.1-1210, the intrinsic X-ray luminosities for the ROSAT and EINSTEIN sources are ~4e43 erg/s (0.1-2.4 keV) and ~1e43 erg/s (0.5-4.5 keV) respectively and they are in the range of Seyfert 1 galaxies (Rush et al.,1996,ApJ,471,190; Kriss et al.,1980,ApJ,242,492). The luminosities were estimated making use of PIMMS to convert the ROSAT PSPC and EINSTEIN IPC count rates to unabsorbed fluxes applying an absorbed power-law model with photon index 2.3 and NH=2.2e21 cm-2. These results suggest that USNO 0778-0495204, the ROSAT, the EINSTEIN and the radio sources are very likely the same extragalactic object and not a microquasar. | 2004-04-04 17:21:00 | radio,optical,x-ray,agn,binary,black hole | 2004-04-04 | 17:21:00 | 1,941 | [
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] | 263 |
265 | A Second Recent Outburst of XTE J1748-361 (or A1744-36) | C. B. Markwardt (NASA/GSFC and U. Maryland) and J. H. Swank (NASA/GSFC) | In November, 2003, Remillard et al. detected a transient with the RXTE ASM, designated XTE J1748-361, which they speculated may be the 1976 Ariel source A1744-36 (ATEL #204).
The RXTE PCA scans of the galactic center confirmed the November outburst (Nov 2.1 UT; 2-10 keV flux 13 mCrab). Since then the source was unobservable until Feb 7, 2004, and undetectable after that (< 0.5 mCrab).
A PCA scan on Apr 7.3 has again detected the source, with flux 12 mCrab. In a follow-up pointed observation on Apr 8.8, the flux was 16 mCrab, indicating the flux may still be increasing. Weak QPOs are detectable at approximately 1.8 and 3.9 Hz with total fractional r.m.s. amplitudes of about 12%. The X-ray spectrum is consistent with a power law with index 1.9.
The source intensities from PCA scans have been fitted with the fixed position, R.A. = 17 48 19.22, DEC = -36 07 16.6 (J2000), of the source reported by McClintock et al. (ATEL #205), which was reported by Rupen (ATEL #210) to have a marginal radio detection. However the fit could be indistinguishably consistent with the ASM position for XTE J1748-361, and in particular the position of the Chandra source (ATEL #238), which has been the brighter radio source (ATEL #210).
Observations now at other wavelengths and with imaging capability will establish at least one transient in the region. | 2004-04-09 23:21:00 | radio,x-ray,binary,black hole,neutron star,star,transient,request for observations | 2004-04-09 | 23:21:00 | 1,350 | [
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] | 264 |
266 | INTEGRAL observes A1744-361 (XTE J1748-361) in hard X-rays | S. A.Grebenev (IKI, Moscow), P. Goldoni (CEA, Saclay), V. Schönfelder (MPE, Garching), J.-P. Roques (CESR, Toulouse), R. A.Sunyaev (IKI, Moscow & MPA, Garching), T. Courvoisier (ISDC, Versoix), C. Winkler (ESA/ESTEC, Noordwijk) | The X-ray transient A1744-361 (XTE J1748-361) was detected with ISGRI/IBIS on April 7-8, 2004 during the INTEGRAL Galactic Center Deep Exposure observation. The average flux in the 17-45 keV band was equal to 19.8+/-1.6 mCrab (the S/N ratio was 13). The photon spectrum was extending to at least 100 keV. The source was seen neither in March during previous GCDE observations nor in the beginning of April during the Galactic Center Open Program observation (the 3-sigma upper limit was 1.5 mCrab). The simultaneous reactivation of the source in the standard X-ray band was detected with RXTE (Atel #265).
A1744-361 was discovered in outburst with Ariel V in February 1976 (IAUC # 2926 ) and was suspected to be an X-ray nova due to rather a long period of activity (~2 months) and a soft X-ray spectrum (Carpenter et al. ApJ, 1977, 179, 27P). The second outburst was detected with RXTE in November-December 2003 (Atel #204). The current INTEGRAL and RXTE detections may mean that the source is at the beginning of its third large outburst.
INTEGRAL is continuing to observe this region. The hard X-ray activity of X-ray novae is often accompanied by an increase in IR and radio flux. We encourage follow-up observations of this source at other wavelengths. | 2004-04-10 01:09:00 | radio,infra-red,optical,x-ray,black hole,nova,transient | 2004-04-10 | 01:09:00 | 1,259 | [
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267 | Discovery of the optical counterpart to XTEJ1748-361=A1744-36 | D. Steeghs (CfA), M. A.P. Torres (CfA), J. E.McClintock (CfA), M. R.Garcia (CfA), G. Mallen-Ornelas (CfA) | We report the discovery of the optical counterpart to the X-ray transient XTE J1748-361 using the 6.5m Magellan-Clay telescope at Las Campanas Observatory. Several 5-minute images in the V and R bands were obtained using the MagIC camera on May 31 as well as November 9 2003 when the object was reported in outburst (ATEL #204). Seeing conditions were 0.8-1.0 arcsec across a field of view of 2.4'x2.4' at 0.069 arcsec/pixel.
The images reveal an optical counterpart that is detected in the V and R band on November 9 that is not present in the May 'quiescent' frames. This counterpart corresponds to one of the faint X-ray sources reported by Torres et al. (ATEL #238) at a position of 17:48:13.13 -36:07:58.17 J2000 and is within the 40 arcsec Ariel error circle of A1744-36. Furthermore, Rupen et al. (ATEL #210) detected a radio source at this position with the VLA during the November 2003 outburst.
We therefore conclude that the X-ray transient XTEJ1748-361 (ATEL #204, #265, #266) and the Ariel source A1744-36 are indeed the same and that we have detected its optical counterpart.
We encourage further observations given its current activity now that its position has been established. A finderchart comparing the two Magellan epochs is available at: http://hea-www.harvard.edu/~dsteeghs/Images/A1744_ID.jpg | 2004-04-10 06:24:00 | radio,infra-red,optical,x-ray,binary,black hole,neutron star,star,transient,request for observations | 2004-04-10 | 06:24:00 | 1,319 | [
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268 | 1989 outburst from A1744-361 | Jean in 't Zand (SRON) | We note that, apart from the outburst in 1976, leading to its discovery (Carpenter et al 1977, MNRAS 179, 27P), and the recent outbursts in December 2003 and April 2004 (Remillard et al. 2003, ATel 204; Markwardt & Swank 2004, ATel 265), A1744-361 was also detected on August 22-23, 1989, with COMIS-TTM (In 't Zand 1992, PhD thesis, see http://wfc.sron.nl/~jeanz/thesis.ps.gz ). The flux was 60 mCrab (2-30 keV), while it was undetectable 5 months earlier and 1 month later at detection thresholds of about 6 mCrab. The spectrum was consistent with thermal bremsstrahlung of temperature 7.2 +/- 1.2 keV and NH<1E22 cm-2. Emelyanov et al. (2001; Astron. Lett. 27, 908) reported the detection of an X-ray burst from this source from the same data. COMIS-TTM was a coded aperture camera on the Mir space station, quite similar to BeppoSAX-WFC but with an angular resolution of 2 arcmin. | 2004-04-11 21:22:00 | x-ray,neutron star,star,transient,a comment | 2004-04-11 | 21:22:00 | 884 | [
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269 | The Orbital Period of IGR J19140+098 | R. H.D. Corbet (NASA/GSFC and USRA), D. C. Hannikainen (University of Helsinki Observatory), & R. Remillard (MIT) | The power spectrum of the Rossi X-ray Timing Explorer All Sky Monitor light curve of IGR J19140+098 (Hannikainen, Rodriguez, & Pottschmidt 2003, IAUC # 8088 ) obtained between February 24 1996 and April 8 2004 shows a strong modulation at a period of 13.55 days. The mean flux measured with the ASM during this interval is 0.4 counts/s (= 5 mCrab) and the Fourier amplitude of the modulation is 0.14 counts/s. A sine wave fit to the ASM light curve gives parameters of: period = 13.558 +/- 0.004 days and epoch of maximum flux = MJD 51593.4 +/- 0.32 The persistence of this period suggests that it arises from the orbital period of an X-ray binary. It is noted that this modulation is also detectable in just the first 3 years of ASM observations indicating activity from this source at that time. | 2004-04-16 03:08:00 | x-ray,binary,black hole,neutron star,star,transient | 2004-04-16 | 03:08:00 | 797 | [
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270 | GX 339-4 going into optical/IR decline | Michelle Buxton, Charles Bailyn (Yale U) | We have been continuously monitoring the black-hole candidate GX 339-4 with the ANDICAM instrument on the 1.3m CTIO telescope in optical and IR bands since the beginning of the latest outburst (ATEL #230, #231, #240). Recent observations indicate that the outburst is now in a declining phase. Our V- and J-band lightcurves may be viewed at http://www.astro.yale.edu/buxton/smarts/light_curves/gx339.html. | 2004-04-17 06:03:00 | infra-red,optical,binary,black hole,transient | 2004-04-17 | 06:03:00 | 405 | [
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] | 269 |
271 | New ULX in M101 | K. D.Kuntz (GSFC & UMBC) and the M101 Megasecond Collaboration | A new ultraluminous X-ray source has been detected in M101 (NGC 5457) during a recent 142 ks observation by the Chandra X-ray Observatory on 14 March 2004 and 19 March 2004. The source is tentatively labeled CXO M101K J140314.27+541806, although the astrometry is still somewhat uncertain.
The source was listed in the catalogue of Pence et al (2001, ApJ 561, 189) as source 51, where it was noted that the flux might be variable within their 92 ks observation. Pence et al also identified this object with H25 of Wang et al (1999, ApJ 523:121), which is only marginally resolved from two other sources in that catalogue.
The spectrum during the new observation is tolerably fit with an absorbed power law, with strong residuals in the 0.85-1.1 keV region, suggestive of Ne or Fe line emission. The fit parameters are an absorbing column of (1.3+/-0.09)e21 cm^-2, a power law index of 2.45+/-0.05 (1 sigma uncertainties), and an unabsorbed luminosity of roughly 2e39 ergs s^{-1} in the 0.5-8.0 keV band. The Pence et al. fits found an absorbing column of 8e21 cm^-2, an index of 2.08, and a luminosity of 5e37 ergs s^{-1}. The lightcurve during the March 2004 observations shows no sign of non-statistical variation.
Before the current outburst, the object seems to have maintained a relatively steady mean flux in the 0.5-8.0 keV band: | 2004-04-17 09:12:00 | x-ray,binary,transient,variables | 2004-04-17 | 09:12:00 | 1,339 | [
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272 | Improved (and revised) position of IGR J19140+0951 with INTEGRAL | C. Cabanac (LAOG, Grenoble), J. Rodriguez (CEA Saclay & ISDC, Versoix), D. Hannikainen (Observatory, Helsinki), N. Lund (DSRI, Copenhagen), P-O. Petrucci (LAOG, Grenoble), G. Henri (LAOG, Grenoble), P. Durouchoux (CEA, Saclay), J. Schultz (Observatory, Helsinki) | We have analysed about 300 ks of JEM-X2 data and about 600ks of IBIS/ISGRI data in order to constrain with more accuracy the position of the transient IGR J19140+0951 (formerly known as IGR J19140+098).
Based on 12 independent detections of the source in JEM-X2 and using JEM-X offline software (Lund et al., 2004) we have derived a weighted mean position. The new position (uncertainty at 90% : 1.7 arcmin) is 2.4 arcmin away from the first position derived with IBIS (IAUC # 8088 ) obtained using early versions of the Offline Scientific Analysis Software.
To cross check the JEM-X2 improved position, we reanalysed the whole IBIS/ISGRI data set using OSA V3.0. The source is clearly detected in 100 ks mosaicked images during Rev number 48, 57, 62 and 70. The revised ISGRI position has an estimated 90 % uncertainty of 2 arcmin and lies only 0.4 arcminutes from the JEM-X2 position.
The weighted mean position given by both instruments is then : R.A. = 19h14m02s, Decl. = 09o53.3' (equinox 2000.0; uncertainty at 90 % : 1.3 arcmin). The new INTEGRAL position puts IGR J19140+0951 5.3 arcmin away from the position of the EXOSAT source EXO 1912+097. However we cannot rule out IGR J19140+0951 and EXO 1912+097 to be the same object. | 2004-04-19 19:48:00 | x-ray,gamma ray,agn,binary,transient | 2004-04-19 | 19:48:00 | 1,238 | [
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273 | A New Transient X-ray Pulsar in the SMC (XTE J0051-727) | R. H.D. Corbet (NASA/GSFC and USRA), C. B. Markwardt (NASA/GSFC and University of Maryland), M. J. Coe, W. R.T. Edge (Southampton University), S. Laycock (CfA), F. E. Marshall (NASA/GSFC) | We have detected a new transient X-ray pulsar in the direction of the Small Magellanic Cloud with the RXTE Proportional Counter Array. The source was found within the 2 degree FWZI field of view of the PCA while pointed at R.A. = 00h50m00s, Decl. = -73o06'00" (equinox 2000.0). Pulsations with periods of 293.9 +/- 0.4 s and 292.7 +/- 0.4 s were seen on 2004 April 19 and April 22 respectively. From fits to slews made over this region in both observations we derive a position of R.A. = 00h51.7m Decl. = -72o45' (equinox 2000). The error box is ellipsoidal with maximum extent 2 sigma statistical errors of approximately +/- 3 arc minutes in R.A. and +/- 1.5 arc minutes in declination. Systematic errors on the source position are unknown but may well be significant and affected by both other sources in this rich field and the effects of the pulsations on the light curve. Collimator response corrected 2 - 10 keV count rates of 3.6 +/- 0.2 (1.7 mCrab) and 3.3 +/- 0.2 (1.6 mCrab) counts/s/Proportional Counter Unit were obtained respectively. The source was not detected in observations made on March 23. | 2004-04-28 04:01:00 | x-ray,binary,neutron star,pulsar,star,transient | 2004-04-28 | 04:01:00 | 1,109 | [
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] | 272 |
274 | A new outburst from XTE J1858+034. Improving the source position. | S. V.Molkov (IKI/SAI, Moscow), A. M.Cherepashchuk (SAI, Moscow), M. G.Revnivtsev (IKI Moscow/MPA Garching), A. A.Lutovinov (IKI Moscow), K. A.Postnov (SAI Moscow), P. Kretschmar (ISDC Versoix, MPE Garching), R. A.Sunyaev (IKI Moscow, MPA Garching) | We report on the detection of a new X-Ray outburst from the X-Ray transient pulsar XTE J1858+034 and improvement of its coordinates.
INTEGRAL observations of the Sgr Arm Tangent field in the end of March 2004 detected a weak source (~2 mCrab in the 18-60 keV energy band, the ISGRI/IBIS telescope) near the position of XTE J1858+034 (~5.5' offset). Subsequent INTEGRAL observations of this region on April 21-24 showed that the source flux increased to ~8 mCrab (18-60 keV). On April 24-27 the source was also clearly detected by the JEM-X telescope in the 3-15 keV energy band. The flux of the source averaged over these observations was ~20 mCrab and ~15 mCrab in 3-15 keV and 18-60 keV energy bands, respectively. The position of the source from the JEM-X data is R.A.=18h58m44s, Decl.=3d26m02s (equinox J2000.0; 1' uncertainty), the ISGRI/IBIS yields R.A.=18h58m43s, Decl.=3d26m06s (equinox J2000.0; 2' uncertainty). Both positions are consistent with each other.
To determine the nature of this source (a new one or the known pulsar) RXTE observations were carried out on April 28. Strong pulsations with a period of 222+/-1.5 s (3-20 keV) were found from the source. Pulsations with the same period were previously detected from XTE J1858+034 (IAUC 6826 ). This fact proves that we are observing now a new outburst from XTE J1858+034. The raster scan observations allowed us to localize the source with PCA/RXTE at the position of R.A.=18h58m52s, Decl.=3d28m19s (equinox J2000.0; 2.5' uncertainty). This localization does not contradict that of INTEGRAL.
We are thankful to the RXTE team for quick scheduling of the observations.
Follow-up observations in different wavelengths are encouraged. | 2004-04-29 18:29:00 | x-ray,gamma ray,pulsar,transient,request for observations | 2004-04-29 | 18:29:00 | 1,703 | [
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275 | New X-ray transient IGR J01363+6610 discovered by INTEGRAL | S. A. Grebenev (IKI, Moscow), P. Ubertini (IASF, Rome), J. Chenevez (DSRI, Copenhagen), A. Orr (ESTEC, Noordwijk), R. A. Sunyaev (IKI, Moscow & MPA, Garching) | A previously unknown X-ray transient, IGR J01363+6610, was discovered by the IBIS/ISGRI telescope on April 19, 2004 during INTEGRAL observations dedicated to the Galactic Plane Scan.
The source position was R.A.=01h36m18s, Decl.=+66d10m36s (equinox 2000.0, position uncertainty 2'). It was within the IBIS field-of-view during 4 subsequent pointings (~2.3 h) and was detected with the total S/N ratio equal to 8.6 and an average flux 17+/-2 mCrab in the 17-45 keV band.
The detection was confirmed by the JEM-X telescope during one of the pointings (when the source was near the center of the JEM-X field-of-view). The JEM-X position was R.A.=01h36m04s, Decl.=+66d11m50s (position uncertainty 2'), the flux was about 9 mCrab in the 8-15 keV band.
The source was not detected with IBIS/ISGRI during next GPS observations of the region on May 1, 2004. The 3-sigma upper limit was 11 mCrab in the 17-45 keV band. The source was outside the JEM-X field-of-view that time.
We encourage observations of this source at other wavelengths. | 2004-05-11 21:23:00 | radio,infra-red,optical,x-ray,gamma ray,binary,black hole,neutron star,star,transient | 2004-05-11 | 21:23:00 | 1,034 | [
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] | 274 |
276 | Search for radio emission from IGR J01363+6610 | Guy Pooley (MRAO, Cavendish Lab, Cambridge) | An observation of IGR J01363+6610 (ATEL #275) at 15 GHz with 4 antennas of the Ryle Telescope, Cambridge UK, on 2004 May 12 from 04h 26m to 14h 07m UT, showed no apparent radio source. The field was centred at ra, dec = 01 36 18 +66 10 36 (J2000), with a FWHM of 6 acrcmin. The rms noise level was 0.27 mJy. | 2004-05-12 23:11:00 | radio,x-ray,transient | 2004-05-12 | 23:11:00 | 307 | [
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] | 275 |
277 | The Orbital Period of the SMC X-ray Pulsar 2E 0050.1-7247 | R. H.D. Corbet (NASA/GSFC and USRA), M. J. Coe, W. R.T. Edge (Southampton University), S. Laycock (CfA), C. B. Markwardt (NASA/GSFC and University of Maryland), F. E. Marshall (NASA/GSFC) | Monitoring of the Small Magellanic Cloud with the RXTE Proportional Counter Array has revealed a periodicity in the X-ray pulsar 2E 0050.1-7247 (Israel et al. 1997, ApJ, 484, L141). An extended outburst from this source was detected on 2003 January 13 and weekly monitoring showed that this particular outburst continued until 2003 February 18. The source was subsequently detected less frequently in continued weekly monitoring and detections of 2E 0050.1-7247, excluding the early 2003 outburst, occurred on the following MJDs: 52849, 52904, 52933, 52940, 52961, 52993, 53019, 53044, 53068, 53075, 53102, 53128, 53136.
These detections show a pattern which is well described by an ephemeris of: T = MJD 52850 +/- 2 + n x 28.0 +/- 0.3 where T is the epoch of outburst and n is the outburst cycle number.
This regular pattern of outbursts strongly suggests that they show the orbital period of this system. A plot showing the difference between predicted and observed times of source detection is available at: http://lheawww.gsfc.nasa.gov/users/corbet/pulsars/2e0050.1_omc.ps
We also examined the MACHO light curves of several stars within the ROSAT error circle and found no modulation at the X-ray period for any object. | 2004-05-13 05:12:00 | x-ray,binary,neutron star,pulsar,star,transient | 2004-05-13 | 05:12:00 | 1,226 | [
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278 | New gamma-ray transient, IGR J11305-6256 discovered by INTEGRAL | N. Produit (ISDC, Geneva), J. Ballet (CEN, Saclay), N. Mowlavi (ISDC, Geneva) | A previously unknown gamma-ray transient, IGR J11305-6256, was discovered by the IBIS/ISGRI telescope on May 12, 2004 during INTEGRAL observation of the Carina region. The source position is: R.A.=11h30m34s DEC= -62d55m51s (equinox 2000.0, position uncertainty 5'). It was in the IBIS field-of-view during 58 hours. It was detected in the overall mosaic of all the data of a revolution at an average flux of 8 mCrab in the 20 to 60 keV band. In the X band (3 to 10 keV), the source cannot be seen in the overall mosaic of the JEM-X detector, neither in any individual pointings where this source is in the JEM-X field-of-view. We encourage observation of this source at other wavelengths. | 2004-05-14 21:05:00 | gamma ray,binary,black hole,neutron star,star,transient,request for observations | 2004-05-14 | 21:05:00 | 688 | [
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] | 277 |
279 | Aql X-1 optical/IR outburst | D. Maitra, C. Bailyn, R. Winnick (Yale), J. Espinoza, D. Gonzalez (CTIO/SMARTS) | SMARTS consortium observations of the transient neutron star X-ray binary system Aql X-1 suggest that it is coming out of a prolonged Low-intensity state (LIS). In a LIS the optical/IR flux is higher than quiescence level but lower than typical outburst maximum, but there is no detectable flux increase in 2-12 keV RXTE ASM bands. For the past two months, Aql X-1 was hovering in a LIS with an R band flux 1.2 magnitude brighter than quiescence (18.8 mag at quiescence) and J band flux about a magnitude brighter than quiescence (16.4 mag at quiscence; also see ATEL #259, #260). Observations since 10th May 2004 show a steady increase in flux in both J (15.0 mag on 16th May 2004) and R (16.5 mag on 16th May 2004) bands which we interpret as the end of the LIS and begining of a new outburst of the source. We note that these measurements include light from the near neighbor star V1333 Aql (Chevalier et al., 1999, A&A, 347,L51). Most recent publicly available ASM data shows no activity in the 2-12keV ASM bands. Multiwavelength observations of the source are encouraged. | 2004-05-18 05:46:00 | infra-red,optical,x-ray,binary,neutron star,star,transient | 2004-05-18 | 05:46:00 | 1,076 | [
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] | 278 |
280 | INTEGRAL detects an new ouburst from Aql X-1 | J. Rodriguez (CEA/SAp, France & ISDC Switzerland), D. C Hannikainen (Obs. of Helsinki), N. Mowlavi (ISDC) | Further to Maitra et al. (Atel #279), we report on the detection of Aql X-1 in the hard X-rays with the INTEGRAL observatory during observations of GRS 1915+105 performed between May 13 and May 15, 2004. The source is significantly detected by the ISGRI detector of the IBIS telescope in the 20-60 keV and 60-200 keV energy ranges at a flux of roughly 110 mCrab in both ranges. Unfortunately Aql X-1 always lies outside the JEM-X field of view. A study of the RXTE/ASM real time data shows that Aql X-1 is at a level of about 50 mCrab in the 1.2-12 keV range. All this suggests that the source is in a hard X-ray state.
Comparison with previous observations (Molkov et al. Atel #259) shows that the source flux has increased by a factor of at least 3 in the lower ISGRI energy range. The long term RXTE/ASM light curve shows, however, that the source returned to a low activity level after the observations of Molkov et al., confirming that it was undergoing a "mini-outburst" event as suggested by contemporaneous optical observations (Ilovaisky & Chevalier Atel #260).
Our INTEGRAL detection and the source state suggest that Aql X-1 is entering one of its normal yearly outbursts as suggested by Maitra et al. Follow-up observations at all wavelengths are strongly encouraged. | 2004-05-18 18:57:00 | radio,millimeter,sub-millimeter,far-infra-red,infra-red,optical,ultra-violet,x-ray,gamma ray,binary,black hole,neutron star,pulsar,star,transient | 2004-05-18 | 18:57:00 | 1,281 | [
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281 | IGR J00370+6122 - A new high-mass X-ray binary | P. R. den Hartog (1), L. M. Kuiper (1), R. H.D. Corbet (2), J. J.M. in 't Zand (1), W. Hermsen (1, 3), J. Vink(1), R. Remillard (4), M. van der Klis(3) (1 SRON Utrecht; 2 NASA/GSFC and USRA; 3 University of Amsterdam; 4 MIT) | We report the discovery of a new variable hard X-ray source, IGR J00370+6122, in a 1.2 Ms INTEGRAL observation of the Cassiopeia region in Dec 2003. The source was found twice while analyzing the data in stretches of ~200 ks. It has a maximum significance of 11.2 sigma in an INTEGRAL IBIS/ISGRI map for the 20-60 keV energy band between MJD 53000.29 and 53002.86. The source position is R.A. = 0h 37m 05.4s, Decl. = +61o 22' 13" (J2000) with an estimated 2' accuracy. The spectrum (20-70 keV) is consistent with a power-law model with a photon index 2.7 +/- 0.3. Archival searches yielded a ROSAT X-ray counterpart (1RXS J003709.6+612131), located at 0.86' from the INTEGRAL position, and a ~10th magnitude (B and V) B1Ib supergiant, BD +60 73. The supergiant is within the 17" error radius of the ROSAT source. Newly derived data from the RXTE ASM (1.5-12 keV) show a mean flux of 1 mcrab (after subtracting a 1 mcrab systematic bias) and a periodicity of 15.665 +/- 0.006 days. The folded light curve shows a quiescent level below 1 mcrab and a single peak with peak flux of 3.3 mcrab. The epoch of maximum flux during the INTEGRAL and contemporaneous ASM observations is MJD 53001.7 +/- 0.3. The BeppoSAX Wide Field Cameras detected IGR J00370+6122 on 4 occasions between Jan 28, 1997, and Jul 12, 1999 with one-day averaged fluxes between 3.0+/-0.7 and 14.9+/-2.1 mcrab (2-28 keV). The epochs of all detections fall within 0.1 in orbital phase from the expected epochs of maximum flux as determined from the ASM ephemeris. The candidate optical counterpart and the X-ray periodicity suggest IGR J00370+6122 to be a supergiant high-mass X-ray binary with an orbital period of 15.665 days. | 2004-05-18 20:53:00 | optical,x-ray,gamma ray,binary,neutron star,star,variables | 2004-05-18 | 20:53:00 | 1,692 | [
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] | 280 |
282 | Optical Identification of 1RXS J003709.6+612131 with BD+60 73 | Robert E. Rutledge (McGill) | Further to the association of 1RXS J003709.6+612131 with the V=9.7 B1Ib star BD+60 73 (ATel #281): This X-ray source has been previously identified with BD+60 73, with a probability of a unique identification of 99.7% ( Rutledge et al 2000 ). The probability was derived using statistical association. | 2004-05-18 21:38:00 | optical,x-ray,gamma ray,binary,neutron star,star | 2004-05-18 | 21:38:00 | 301 | [
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] | 281 |
283 | Superorbital Period in the high mass X-ray binary 2S 0114+650 | S. Farrell, R. Sood (UNSW@ADFA), P. O'Neill (Imperial College) | We report the identification of a superorbital period in the high mass X-ray binary 2S 0114+650. RXTE ASM observations of this object from 1996 Jan 5 to 2003 May 26 show the presence of a modulation at a period of 30.7 +/- 0.2 days. This period is detected using a Lomb-Scargle periodogram, and has a false-alarm probability of 5E-12. Epoch folding of the data gives an ephemeris of JD 2450079.4 (+/- 0.7) +30.7 (+/- 0.2)N, where N is the cycle number, with phase zero defined as the modulation minimum, and a full amplitude of 60 +/- 20%. The 30.7 day modulation does not appear to be an artefact of either the 2.7 hr pulse or the 11.7 day orbital period. This modulation can be interpreted as a previously unreported superorbital period. This work is being reported in full in Farrell et al. (2004). | 2004-05-20 14:34:00 | optical,x-ray,binary,neutron star,pulsar,star | 2004-05-20 | 14:34:00 | 801 | [
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284 | Correlated X-ray and IR decaying flux from the Anomalous X-ray Pulsar XTE J1810-197 | N. Rea(Univ. Rome2/INAF-OAR), G. L.Israel(INAF-OAR), V. Testa(INAF-OAR), L. Stella(INAF-OAR), S. Mereghetti(IASF-MI), A. Tiengo(IASF-MI), T. Oosterbroek(ESA-ESTEC), V. Mangano(IASF-PA), S. Campana(INAF-OAB), S. Covino(INAF-OAB), G. Lo Curto(ESO), R. Perna(Princeton) | The field of XTE J1810-197 was imaged by VLT-UT4 Yepun with the Nasmith Adaptive Optics System and the High Resolution Near IR Camera (NAOS-CONICA) on 2004 March 12, 13, and 14, as part of a monitoring program for this source. Observations were obtained with sub-arcsecond seeing and good sky conditions, resulting in a point-like source PSF between 0.09" and 0.12". J, H and Ks band images were obtained for a total exposure time of 48, 36 and 52 minutes, respectively. We found the following IR magnitudes for the proposed IR counterpart (Israel et al. 2004, 603, L97): Ks = 21.4 +\- 0.1, H= 22.7 +\- 0.2 and J > 23.0 (3 sigma upper limit). Within a radius of about 7" from the Chandra uncertainty region only the proposed IR counterpart to XTE J1810-197 showed a significant variation with respect to our previous VLT-NACO observation carried out on October 2003 (Israel et al. 2004, 603, L97), with DeltaH = 0.7 +\- 0.2 and DeltaKs = 0.5 +\- 0.1. This decrease by a factor of about two in the IR flux unambiguously confirms the link between the X-ray source and the IR object.
We also analysed an unsolicited 17ks Target of Opportunity observation of XTE J1810-197 carried out by XMM-Newton one day before the VLT run (2004 March 11). The source spin period was 5.53974 +/- 0.00005s (90% uncertainty). The pulsed fraction, pulse profile and spectral parameters did not change significantly compared to the previous XMM-Newton observation performed about six months before (Tiengo & Mereghetti 2003, ATel #193; Gotthelf et al. 2004, ApJ, 605, 368), except for the normalisation. The 0.5-10 keV flux on March 11th was 2x10^-11 erg/s/cm^-2 (absorbed flux; Nh=0.97 +/- 0.05 x10^22 atoms*cm-2), a factor of two lower with respect to the previous XMM-Newton observation. These results together with a comparison with the emission models for anomalous X-ray pulsars are reported in full by Rea et al. (2004).
We thank the VLT team for their help in carrying out the IR NACO-images and the XMM-Newton team for prompt XTE J1810-197 data release. | 2004-05-21 19:30:00 | infra-red,x-ray,neutron star,pulsar,star,transient | 2004-05-21 | 19:30:00 | 2,042 | [
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285 | BD +60 73 = IGR J00370+6122 | Ignacio Negueruela (Univ. Alicante), Pablo Reig (IESL, Foundation for Research and Technology-HELLAS) | A classification spectrum of BD +60 73, reported to be the optical counterpart to IGR J00370+6122 (ATel #281), was taken on the night of 2003 July 7th with the 2.5-m Issac Newton telescope at La Palma. The derived spectral type is BN0.5II-III, where the composite luminosity class indicates an intermediate luminosity. The Nitrogen enhancement is moderately high, with numerous NII lines being rather stronger than corresponds to the spectral type. There is, however, no obvious Carbon depletion.
UBV photometry is reported by Hiltner (1956, ApJS 2, 389) and Haug (1970, A&AS 1, 35). Their values are identical within the errors and give V=9.64, (B-V)=0.57. Assuming Mv=-5.2, intermediate between the values for luminosity class II and III, we obtain E(B-V)=0.78 and DM=12.4, corresponding to d=3.0 kpc, a typical value for the "far" component of Cas OB5 (Ampel 1964, AcA 14, 52).
A low resolution spectrum covering the yellow/red region of the spectrum was taken on 2004 May 21st, using the 1.3-m telescope at Skinakas (Crete). HeI 5875, HeI 6678 and H-alpha seem to be strongly in absorption, as is morphologically normal for the spectral type. BD +60 73 does not apper to be a Be stars.
Accretion from a relatively low-density wind in an eccentric orbit would explain the low X-ray luminosity and strong orbital modulation reported in ATel #281. | 2004-05-23 05:09:00 | optical,x-ray,binary,neutron star,star,variables | 2004-05-23 | 05:09:00 | 1,351 | [
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] | 284 |
286 | On-going radio flare in Aql X-1 | M. P. Rupen, A. J. Mioduszewski, V. Dhawan (NRAO) | Very Large Array (VLA) observations of the transient neutron star X-ray binary system Aql X-1, currently active at X-ray, optical, and infrared wavelengths (ATEL #259, #260, #279, #280), show that a faint radio outburst is also underway. Our 8.46 GHz observations gave the following nominal flux densities at the location of the source:
These radio data are consistent with a flare corresponding to the optical/IR rise seen by the SMARTS consortium (cf. ATEL #279). Interestingly, no similar radio emission was seen during the last optical/IR flare in March/April 2003, which was also a strong soft X-ray event as seen with RXTE's All-Sky Monitor; the radio rms noise levels were 50-70 microJy/beam at 8.46 GHz. The radio emission thus seems to track the hard rather than the soft X-rays. Further radio observations are planned.
Observational details:
The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. | 2004-05-27 04:19:00 | radio,infra-red,optical,x-ray,binary,neutron star,star,transient,variables | 2004-05-27 | 04:19:00 | 1,014 | [
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287 | Aql X-1 optical state | S. A. Ilovaisky, C. Chevalier (OHP) | CCD photometry of V1333Aql/Aql X-1 obtained with the 1.2-m telescope at Haute-Provence (OHP) in the interval May 18-24 shows the average magnitude to have been nearly constant around V=17. This is comparable to the maximum optical brightness we observed during the weak 2002 (presumably hard) outburst. Publicly available 2-10 keV ASM RXTE/Rossi data exhibit a continuing slow rise, from roughly 50 to 70 mCrab over this same time interval. | 2004-05-27 16:05:00 | optical,binary,neutron star,star,transient | 2004-05-27 | 16:05:00 | 440 | [
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] | 286 |
288 | Aql X-1 outburst in Optical/IR/X-rays | D. Maitra, C. Bailyn, R. Winnick (Yale), J. Espinoza, D. Gonzalez (CTIO/SMARTS) | Daily optical/IR imaging of Aql X-1 by the SMARTS consortium using the ANDICAM instrument on the 1.3m telescope confirm the high optical state reported by Ilovaisky and Chevalier (ATEL #287). Around 11th May 2004 the O/IR began a strong rise from a persistent intermediate state (with average magnitudes of R = 17.3 and J = 15.7), and then reached a peak near 25-26th May (at R = 16.3 and J = 14.6)and now is declining again. The present R band optical flux is near 16.6 mag and infrared J flux near 14.8 mag. Our RXTE/PCA peliminary results show that the soft X-ray flux has been increasing as well, accompanied by frequent type I bursts. Four type I bursts were seen in RXTE pointings between 23rd and 26th May. Frequent Type I bursts observed during previous outbursts of Aql X-1 suggest that the source might soon make a transition to soft state (if it has not already done so). | 2004-05-28 07:12:00 | infra-red,optical,x-ray,binary,neutron star,star,transient | 2004-05-28 | 07:12:00 | 882 | [
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289 | Chandra and Optical Identification of AX J1841.0-0536 | J. P. Halpern, E. V. Gotthelf, D. J. Helfand, S. Gezari (Columbia U.), G. A. Wegner (Dartmouth) | We observed the field of the transient 4.74 s X-ray pulsar AX J1841.0-0536, suspected to be a Be/X-ray binary [Bamba et al., PASJ, 53, 1179 (2001)], with the Chandra ACIS arrays for 20 ks on 2004 May 12. A bright, variable source was detected off-axis on the I3 CCD at (J2000) 18h41m0s.54, -05°35'46".8. Its spectrum can be fitted with a power law of photon index Γ = 1.35±0.30, column density NH = (6.1 ± 1.0)×1022 cm-2, and flux F(0.5-10 keV) = 4.2×10-12 ergs cm-2 s-1. These parameters are all within the range measured by Bamba et al. for AX J1841.0-0536.
An optical/IR candidate was selected by positional coincidence from the digitized UK Schmidt plates and 2MASS, at coordinates (J2000) 18h41m0s.43, -05°35'46".5. Its magnitudes from the USNO B1.0 and 2MASS catalogs are B=15.91, R=12.78, I=10.90, J= 9.74, H=9.22, K= 8.93. Spectra of this star obtained on the 2.4m Hiltner Telescope of the MDM Observatory on 2004 May 27 and June 9-10 show He I and Balmer absorption typical of a B star, as well as interstellar Na I D absorption and several of the diffuse interstellar bands. In addition, a weak, double-peaked Hα emission line is seen, confirming the Be star hypothesis. The brightness of the optical counterpart and the strengths of its interstellar absorption features indicate that most of the X-ray measured NH must be due to absorbing material intrinsic to the X-ray binary. | 2004-06-10 23:35:00 | infra-red,optical,x-ray,binary,neutron star,pulsar,star,transient,variables | 2004-06-10 | 23:35:00 | 1,390 | [
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] | 288 |
290 | burst in 1E 1145.1-6141 | A. Bodaghee (ISDC), N. Mowlavi (ISDC), J. Ballet (CEN-Saclay) | We report the brightening of the high-mass X-ray binary 1E 1145.1-6141 by a factor of 4 in 20--60 keV between June 10 (00:00 UTC) and June 11 (09:30 UTC), reaching about 130 mCrab in this energy range. The burst was recorded by the ISGRI detector on board INTEGRAL during an open observation of the Carina region. To our knowledge, no such burst has been mentioned in the literature so far, as the source is believed to be a persistent and steady X-ray pulsar with a flux up to 20--30 mCrabs (Grebenev et al., 1992, see also Ray & Chakrabarty, 2002). No increase is detected by ISGRI in 60--200 keV. In the only pointing for which 1E 1145.1-6141 was in the JEM-X FOV (June 11, 03:30 UTC), the flux is about 40 mCrab in 3--10 keV. Further observations during the Carina open program on June 12th shows a decrease of the flux below 100 mCrab. This would indicate that 1E 1145.1-6141 went into an episode of burst of about 2 days. | 2004-06-13 01:47:00 | x-ray,gamma ray,binary,pulsar,transient | 2004-06-13 | 01:47:00 | 927 | [
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] | 289 |
291 | The near-IR counterpart to the high-mass X-ray binary X1908+075 | T. Morel (Palermo Observatory, Italy) and Y. Grosdidier (McGill University, Canada) | We report the near-IR identification of the likely counterpart to X1908+075, a highly-absorbed Galactic X-ray source recently suspected to belong to the rare class of OB supergiant-neutron star binary systems (Wen et al. 2000, ApJ, 532, 1119; Levine et al. 2004, ApJ, submitted, astro-ph/0404428). The Einstein and HEAO 1 satellites have localized this X-ray source with an uncertainty of about 50''.
JHKs-band imaging of the field was carried out on service observing mode on August 9, 2001 (JD 2,452,131.50) with the near-IR camera CAIN-II mounted on the Carlo Sanchez Telescope (TCS) at Teide Observatory (Spain). The observations were carried out under photometric sky conditions and a seeing of about 1.6''. We identified a source localized at 19h 10m 48.20s and +07deg 35' 52.3'' (J2000) with: J=13.199+/-0.018, H=11.380+/-0.012 and Ks=10.457+/-0.018. These near-IR magnitudes are compatible with an early-type star lying at d~7 kpc and suffering A(V)~16.5 mag of extinction, the latter value being in good agreement with the hydrogen column density derived from the modelling of the X-ray spectrum.
Follow-up, medium resolution HK spectroscopic observations of this candidate was obtained on service observing mode with the near-IR spectrograph CGS4 at UKIRT (JD 2,452,419.04). The star presents He I features in absorption, but no He II or C IV lines. N III 2.1155 and Brackett gamma are in emission. These spectral diagnostics lead to a O7.5-O9.5 If classification, although a very early B supergiant cannot be ruled out (Hanson et al. 1996, ApJS, 107, 281; Hanson et al. 1998, AJ, 116, 1915). This classification is internally consistent with the near-IR photometric properties.
A paper reporting these results has been recently submitted to MNRAS. | 2004-06-18 22:05:00 | infra-red,x-ray,binary,neutron star,pulsar,star | 2004-06-18 | 22:05:00 | 1,761 | [
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292 | Spectroscopic Observations of MCQC J162847-4152 | M. A. P. Torres (CfA), M. R. Garcia (CfA), D. Steeghs (CfA), J. E. McClintock (CfA), J. S. Bloom (CfA) | We obtained moderate/low resolution spectroscopy (2/5 AA FWHM) of the microquasar candidate MCQC J162847-4152 (hereafter J1628) on 2003 May 5/6/13 (UT) and June 22/23/25 with the B&C spectrograph mounted on the 6.5-m Baade and Clay telescopes at LCO. In addition, high resolution spectra (R~27000 and 36000 in the blue and red respectively) were acquired with the MIKE echelle on the Baade telescope during 2003 May 12/13. The optical spectrum of is dominated by broad absorption lines with a FWHM of 57 +/- 3 km/s as measured from the MIKE data. Inspection of the 5500-8420 AA sp. interval shows that the sp. type/luminosity class of J1628 is in the range of K3 +/- 1 III-IV. RVs were measured by cross-correlating the observed spectra with the spectrum of a K3III template. The RV variations, with a full range of ~ 100 km/s, confirm the binary nature of J1628. We fit sinusoids to the RVs using the photometric periods (P_ph=4.835 d or ~2xP_ph d; ATEL #234) as initial guesses for the orbital period. From the best fit we find P=4.986 +/- 0.005 d; K_2 = 49 +/- 1 km/s and a time of closest approach of the secondary to the observer of T_0 = HJD 2,452,767.895 +/- 0.035. The quoted uncertainties are 1-sigma and were obtained after scaling the errors in the RVs in order to give chi**2/dof=1. The value of P is discrepant with and 3% larger than P_ph. We note the existence of significant deviations from the fit (see phase-folded RV curve in URL link), and therefore caution that our results are tentative. We find f(M)=0.061 +/- 0.004 Msun from the above P and K_2. Under the assumption of synchronous rotation we set a lower limit to the stellar radius of ~6 Rsun from the rotational broadening and P. The MIKE spectra show the presence of the KI 7699 interstellar line blended with the broader KI photospheric line. We measure an EW of about 0.08 AA for the interstellar feature after fitting the blend with a double-Gaussian model. Using the calibration of Munari & Zwitter (1997,AAp,318,269) we derive an interstellar extinction to J1628 of E(B-V)~0.3. The Halpha line is in emission, with FWHM~250 km/s and EW values between 0.3-1.1 AA, except on May 6, when the EW increases to 4 AA (see also ATEL #80). The Halpha profile obtained from the MIKE spectra shows a double-peak shape that could be interpreted as emission arising from an accretion disk. However, variable broad Halpha emission with a self-reversal core is not unexpected in RS CVn stars. The CaII H & K lines have emission cores with likely absorption reversal at the top of the emission. We estimated a value of the absolute visual magnitude of 1.6 for the secondary of J1628 by using the Wilson-Bappu (WB) relation (eq. 6 in Montes et al. 1994,AAp,285,609). This value is significantly above that for K3 V stars (Mv=6.8) and close to the value of K3 giants (Mv=0.3). We calculate a distance of 1.5 kpc to J1628 by using Mv=1.6, V=13.4 (ATEL #80) and Av=0.93. Assuming an absorbed Raymond-Smith model the ROSAT PSPC count rate implies an unabsorbed flux of 2.8e-12 erg/cm**2/s (0.1-2.4 keV). A distance of 1.5 kpc yields an intrinsic X-ray luminosity of ~8e32 erg/s, a value above the range of X-ray luminosities observed in RS CVn stars (1e29-3e31 erg/s; Dempsey et al. 1993,APJSS,86,559). If J1628 is a rapidly rotating RS CVn, it may deviate from the WB law due to the influence of rotational broadening, explaining the discrepancy in the X-ray luminosity. An X-ray luminosity of 3e31 erg/s implies d~300 pc and Mv~5. Since the companion star is not detected in our spectra, its visual luminosity should be ~100 times less than the visible star, i.e. Mv>10 if we adopt Mv=5. On this basis, the unseen companion is probably a M dwarf or a WD. The above results suggest a RS CVn (not a microquasar) nature for J1628. However, the paucity of RV measurements and the deviations from the sinusoidal fit reported herein demonstrate the need for additional data. | 2004-06-22 14:19:00 | optical,x-ray,binary,star,transient,variables | 2004-06-22 | 14:19:00 | 3,932 | [
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293 | Detection of AXP 4U 0142+614 with INTEGRAL | P. R. den Hartog(1), L. Kuiper(1), W. Hermsen(1, 2), J. Vink (1) (1 SRON - National Institute for Space Research, Utrecht, The Netherlands; 2 Astronomical Institute, University of Amsterdam, The Netherlands) | We report the detection of the Anomalous X-ray Pulsar 4U 0142+614 at energies between 20 keV and 100 keV with IBIS/ISGRI aboard INTEGRAL. The source was detected in the field of view of the observations of the Cassiopeia region in December 2003. In the energy bands 20-50 keV and 50-100 keV it showed up with 4.8 sigma and 6.1 sigma detection significances, respectively, corresponding with 1.5 +/- 0.3 mcrab and 3.7 +/- 0.6 mcrab. This is the third AXP detected as a hard X-ray/ soft gamma-ray source with INTEGRAL. The previous two are 1E 1841-045 (Molkov et al. 2004, Bassani et al. ATEL #232) and 1RXS J170849-400910 (Revnivtsev et al. 2004). All three AXPs are unambiguously identified as AXPs by their timing signatures. Follow up timing analysis of archival RXTE-PCA and HEXTE data revealed for all three AXPs pulsed emission up to about 100 keV with similar very hard power-law spectra above 20 keV with photon indices of about 1 (for 1E 1841-045 see Kuiper et al. 2004 (APJ in press, astro-ph/0404582); for the other two sources see Kuiper et al. 2004 (A&A in prep)).
The nearby (24') source RX J0146.9+6121 is also detected by INTEGRAL in the 20-50 keV band as a 2.6 +/- 0.3 mcrab source. 4U 0142+614 and RX J0146.9+6121 are clearly resolved and therefore there is no source confusion. | 2004-06-28 19:34:00 | x-ray,gamma ray,neutron star,pulsar,star | 2004-06-28 | 19:34:00 | 1,296 | [
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294 | Aql X-1 optical outburst ends | S. A.Ilovaisky and C. Chevalier (OHP) | Optical monitoring of the recurrent transient V1333 Aql/Aql X-1 obtained with the 1.2-m Haute-Provence telescope shows that the source slowly declined in brightness over the past two weeks and that it returned to quiescence sometime between UT 26.0 and 27.0 June, the large-amplitude 19-h modulation being absent during the last nights. Publicly available 2-10 keV ASM Rossi/XTE X-ray data show the source dropped below detectability around June 20, after more than four months of moderate activity. | 2004-06-29 18:22:00 | optical,x-ray,binary,neutron star,star,transient | 2004-06-29 | 18:22:00 | 499 | [
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] | 293 |
295 | X-ray Reappearance of V4641 Sgr | Jean Swank(NASA/GSFC) | VSNET observers reported that V4741 SGR brightened optically today. Coincidentally V4641 Sgr was observed in the RXTE PCA scans of the Galactic Bulge on 2004 Jul 03, UT 11:54, for the first time since 2004 Jun 01, UT 17:35. The flux was 8.2 mCrab 2-10 keV, while it was last bright (66 mCrab) on 2003 Aug 6 and was generally below 0.5 mCrab during intervening observations. Additional RXTE observations are planned. | 2004-07-05 02:25:00 | x-ray,binary,black hole,transient,request for observations | 2004-07-05 | 02:25:00 | 415 | [
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296 | Radio Reappearance of V4641 Sgr | M. P. Rupen, A. J. Mioduszewski, V. Dhawan (NRAO) | Very Large Array (VLA) observations of the black hole candidate binary V4641 Sgr, currently active at optical wavelengths (see VSNet), reveal an on-going radio outburst. Data taken on 5 July 2004 from 07:47 to 09:32 UT gave clear detections of an optically thin, steep spectrum source (flux density going as frequency to the -0.7 power):
There is marginal evidence that the flux density decreased during these observations. Two independent measurements at 8.46 GHz for instance showed the source to be 5.28 +/- 0.38 mJy at MJD 53191.3259 and 3.64 +/- 0.29 mJy at MJD 53191.3797, a decrease of 1.64 +/- 0.48 mJy over 80 minutes. This combined with the optically-thin spectrum suggests we are seeing the decaying part of an earlier radio flare.
Our most recent pre-outburst observations were made at 8.46 GHz on 6 June 2004, yielding a non-detection with a nominal flux density of -0.026 +/- 0.083 mJy/bm at the location of the source.
Given the strong variability previously seen for this source, and the on-going optical activity, further flares at all wavelengths are quite likely. This strong and unpredictable variability makes truly simultaneous observations essential to understanding the nature of this unique system. Accordingly, we will post a schedule of all the upcoming observations we know about on the Web, at http://www.aoc.nrao.edu/~mrupen/XRT/V4641Sgr/v4641sgr.shtml. We would greatly appreciate advance notification of any additional observations that do not appear on this list, to aid other observers in planning their own simultaneous campaigns.
The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. | 2004-07-06 06:59:00 | radio,infra-red,optical,x-ray,binary,black hole,star,transient,variables | 2004-07-06 | 06:59:00 | 1,729 | [
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297 | Optical observations of V4641Sgr | M. Revnivtsev (IKI, MPA), I. Khamitov(TUG), R. Burenin(IKI),M. Pavlinsky(IKI),R. Sunyaev (IKI, MPA), Z. Aslan(TUG), I. Bikmaev(KSU),N. Sakhibullin(KSU) | The X-ray binary system V4641 Sgr (=SAX J1819.3-2525) was observed in Rc band with the 1.5-m Russian-Turkish telescope RTT150 at TUBITAK National Observatory (Turkey) during the period 18:57-21:57 UT, July 5, 2004. The Rc magnitude of the source averaged over all observations was m_Rc~13.5, that is slightly higher than that in its quiescent state at this orbital phase. We obtained a lightcurve with time resolution 13.5 sec. Along with stable trend, likely caused by the orbital variations of the system brightness there was detected chaotic variability at time scales ~1000 sec. Power spectrum of such variations can be described by a power law with the slope -1.5 in the frequency band 10^-4-3x10^-3 Hz (http://db.rsdc.rssi.ru/V4641Sgr/2004/ps.pdf) V4641 Sgr at this stage obviously lacks the violent variability that it demonstrated in Aug. 2003 (see ATEL #174) Historical phase light curve of V4641 Sgr with overplotted July 5, 2004 observations http://db.rsdc.rssi.ru/V4641Sgr/2004/20040705_0.jpg | 2004-07-06 19:45:00 | optical,x-ray,binary,black hole,request for observations | 2004-07-06 | 19:45:00 | 1,004 | [
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298 | X-ray Burst from the direction of 1E 1048.1-5937 | V. Kaspi, F. Gavriil (McGill U.), P. Woods (USRA/NSSTC), D. Chakrabarty (MIT) | We report the discovery of a single X-ray burst from the direction of the anomalous X-ray pulsar 1E 1048.1-5937, in data from the Rossi X-ray Timing Explorer Proportional Counter Array, obtained on June 29, 2004. The burst is present in all operational PCUs. A preliminary inspection shows that the burst properties are qualitatively similar to the two bursts observed in 2002 from this direction by Gavriil, Kaspi & Woods (2002, Nature, 419, 142). This may indicate that the source is entering a burst-active phase. More information will be posted as it becomes available. Rossi X-ray Timing Explorer and coordinated Chandra Target-of-Opportunity observations are planned. Observations at other wavelengths, especially infrared, are encouraged. | 2004-07-07 00:54:00 | x-ray,gamma ray,neutron star,pulsar,soft gamma-ray repeater,star,request for observations | 2004-07-07 | 00:54:00 | 745 | [
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] | 297 |
299 | Optical spectroscopy of V4641 Sgr | L. Kiss (University of Sydney), Sz. Meszaros (University of Szeged) | Optical spectra (range 600-690 nm; resolution 6000) were obtained during the current outburst of this black hole binary on July 4.65-4.75 UT with the Siding Spring 2.3-m telescope (+ DBS CCD spectrograph), right after the first visual reports appeared via vsnet-obs and vsnet-alert. The spectra were dominated by a very strong and broad H-alpha emission line with a full width at zero intensity of about 6000 km/s. The He 6678 line was also in emission, showing two distinct components separated by 1000 km/s. Spectra in the blue (range 490-540 nm; resolution 10000) showed strong changes in the double-peaked emission profile of the He 5015 line over a period of 6 hours (July 4.49-4.73 UT). | 2004-07-07 23:01:00 | optical,binary,black hole,request for observations | 2004-07-07 | 23:01:00 | 692 | [
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] | 298 |
300 | Radio Monitoring of V4641 with RATAN-600 | S. A. Trushkin (SAO RAS) | We have daily observed V4641 from 9 May up today at 2.3, 4.8, 7.7, 11.2 and 21.7 GHz with RATAN-600 radio telescope. We have reliably detected V4641 June 25, 21:20UT: | 2004-07-09 03:38:00 | radio,binary,black hole | 2004-07-09 | 03:38:00 | 166 | [
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