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101
A new X-ray outburst of XB 1745-25 in the globular cluster Terzan 5
Rudy Wijnands (MIT), Jeroen Homan (Brera Observatory), Ron Remillard (MIT)
We report the detection of a new X-ray outburst of the neutron star X-ray transient XB 1745-25 located in the globular cluster Terzan 5. The All Sky Monitor aboard the Rossi X-ray Timing Explorer began detecting the source on or near 2002 June 25, when it rapidly rose to 87 +/- 7 mCrab at 2-12 keV. It then appears to have leveled off, before rising again to 200 mCrab during June 29 to July 2. The source was previously found to be in outburst in 2000 July - August (Markwardt & Swank 2000, IAUC 7454 ), but has since been in quiescence. The best known X-ray position can be obtained from an archival Chandra/ACIS-I observation (performed on 2000 July 24) during that outburst and is R.A.=17h48m05.244s, Dec.=-24 46' 47.7", with a uncertainty of 0.5 arcseconds. This position includes a small shift to tie the Chandra frame with the 2MASS J frame using a field star detected in both data sets. Observations at all wavelengths are strongly encouraged. A HST/NICMOS finding chart (F110W filter) can be found in Edmonds et al. (2001, ApJ, 547, 829; their Figure 3 and the source is located in the upper left corner in the ROSAT error circle).
2002-07-03 06:12:00
radio,infra-red,optical,x-ray,binary,globular cluster,neutron star,star,transient,request for observations
2002-07-03
06:12:00
1,141
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100
102
The optical counterpart to XTE J1855-026
Francesco Verrecchia (ASDC, Rome), Ignacio Negueruela (University of Alicante), Stefano Covino (INAF - Merate Observatory), GianLuca Israel (INAF - Rome Observatory)
We report observations of the likely optical counterpart to the 361-s X-ray pulsar XTE J1855-026 (Corbet et al. 1999, ApJ 517, 956; Corbet & Mukai 2002, astroph/0207181), which is part of an eclipsing binary with a 6.01-d orbit. Our candidate is a relatively bright star right on the edge of the new 12" ASCA error circle (Corbet & Mukai 2002, astroph/0207181), which doesn't contain any obvious candidate, and therefore the likely optical counterpart (coordinates from SIMBAD RA: 18:55:30.5, Dec: -02:36:21). The object was identified in 1999 from observations taken at the Loiano Observatory (Bologna, Italy) as the only H-alpha emission line object inside the 2' XTE error circle of XTE J1855-026. Low-resolution spectroscopy (4800-7000A) taken on 15th September 1999 with the ESO 3.6-m telescope at La Silla shows weak H-alpha emission (EW=-6A) and HeI absorption lines on a very steep continuum (B=16.1, I=11.5), indicating a very reddened early-type star. Likely emission-infilling in H-beta and a shallow weak HeII4541A line suggested that the object was likely not a supergiant, as the orbital solution seemed to imply. A red intermediate resolution spectrum taken on 17th July 2000 with the OHP 1.93-m telescope shows double-peaked (with much stronger red peak) H-alpha emission with an EW=-5.5A and apparent weak P-Cygni profiles in the HeI lines, which, if real, should indicate mass loss. The observed asymmetric emission line profiles may be interpreted as those of a Be star with a Global One-Armed Oscillation in its circumstellar disk. However, as this object is likely to be the counterpart (and therefore have a neutron star orbiting in a 6-d orbit), we interpret them as P-Cygni profiles due to extended mass loss. Further observations are underway in order to confirm if the object is a supergiant. We note that systems containing a neutron star accreting from a non-supergiant early star via localized Roche-Lobe overflow are known (c.f. LMC X-4), however the position of the pulsar in the Corbet diagram favours wind accretion from a blue supergiant.
2002-07-15 03:29:00
optical,x-ray,binary,neutron star,pulsar,star
2002-07-15
03:29:00
2,076
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101
103
State Transition of the Black Hole Candidate 4U 1543-47
E. Kalemci, J. Tomsick, R. Rothschild (CASS/UCSD), S. Corbel (CEA Saclay), P. Kaaret (CfA), J. McClintock (Harvard)
An analysis of Rossi X-ray Timing Explorer pointed observations of the black hole transient 4U 1543-475 (see ATEL#98 and IAUC# 7920 ) indicates that the source is currently in transition, possibly to the low hard state. The X-ray spectra of two observations taken on July 23 and July 24 show a multicolor disk component with ~0.4 keV inner disk temperature and a power law with a photon index of ~2.65. The 2-15 keV band power spectrum has an rms amplitude of ~20%, with a QPO at ~9 Hz and its harmonic at ~18 Hz. The rms amplitude of the QPO is ~6%. The QPO frequency did not move between observations. Further evolution of the temporal and spectral parameters of the source was seen for observations taken on July 25 and July 26. The power law index hardened to ~2.1, and the disk temperature decreased. This was accompanied by an increase in the overall rms amplitude of variability to ~30%, and a decrease in QPO frequency to 5.6 Hz. RXTE All-Sky Monitor hardness ratios indicate that the transition began on July 21 or July 22. We will continue to monitor the source with RXTE, and we encourage observations in the optical and radio bands.
2002-07-27 03:58:00
radio,optical,x-ray,binary,black hole,transient,request for observations
2002-07-27
03:58:00
1,144
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102
104
Magnitudes of X-ray Nova XTE J1650-500 in Quiescence
M. R. Garcia (CfA), B. J. Wilkes (CfA)
Observations of the optical counterpart to XTE J1650-500 with the Magellan 1 telescope find it fainter than expected based on reports of it's possible detection on the DDS2 red (Groot etal IAUC 7708 ) and blue (Castro-Tirado etal IAUC 7707 ) plates. The observations were made with the Sackler MagIC CCD camera in non-photometric conditions on 03 Aug 2002, but allow us to estimate R~22 (at 04:06 UT) and V~24 at (04:12 UT). We note the presence of a brighter star ~1.5 arcsec to the West of the counterpart with R~20 and V~22, which is faintly detected on the DDS2 red plates and may be blended and confused with the counterpart on the plates. An I-band image of the field as seen from Magellan 1 on 02 Aug 2002 may be found at: http://hea-www.harvard.edu/~garcia/xtej1650.MagIC.02aug2002.ps
2002-08-10 10:25:00
optical,x-ray,binary,black hole,nova,star,transient
2002-08-10
10:25:00
792
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103
105
Low Quiescent X-Ray and Radio Flux Levels from the Black Hole Transient V4641 Sgr
John A. Tomsick (UCSD), Michael P. Rupen (NRAO), Stephane Corbel (Universite Paris VII and CEA Saclay), Vivek Dhawan (NRAO), Rob Fender (University of Amsterdam), Philip Kaaret (Harvard-Smithsonian CfA), Erik Kuulkers (Utrecht University and SRON), Jon M. Miller (MIT), Amy J. Mioduszewski (NRAO), Jerome A. Orosz (SDSU), Tasso Tzioumis (ATNF) and Rudy Wijnands (MIT)
Recent X-ray and radio observations of the dynamically confirmed black hole transient and relativistic radio jet source V4641 Sgr indicate that the source may be in a low quiescent state after its high level of activity in 2002 May and June (IAUCs 7906 , 7908 and 7928 ). The source was not detected in the X-ray band during a 4.3 ks Chandra ACIS-S observation made on August 5.2 UT. Assuming a power-law energy spectrum with a photon index of 2 and interstellar absorption with a column density of N_H = 2e21 cm^-2 gives a 3-sigma upper limit on the absorbed 0.5-7 keV flux of 1.3e-14 erg cm^-2 s^-1 and a corresponding luminosity upper limit of 1.0e32 (d/7 kpc)^2 erg s^-1. VLA radio observations at 8.46 GHz on August 1, 3, 6, 8 and 13, each comprising 3-6 minutes on source, gave no detections with rms noise levels between 0.07 and 0.1 mJy/beam. The last VLA detection was on 2002 July 12, when the source varied over the course of 30 minutes between <0.2 and 0.5 mJy/beam.
2002-08-21 02:19:00
radio,x-ray,binary,black hole,transient
2002-08-21
02:19:00
978
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-0.024642083793878555, -0.026640813797712326, 0.02268773317337036, 0.008098701946437359, -0.09000438451766968, 0.05240027606487274, -0.03482671454548836, -0.10010050982236862, -0.0022416335996240377, -0.036404576152563095, -0.007710956037044525, 0.0042718155309557915, -0.05377572029829025, -0.07264474034309387, -0.08235199749469757, -0.0061360192485153675, -0.049045369029045105, 0.015154242515563965, -0.03816237673163414, -0.08175648003816605, 0.09944657236337662, -0.06590497493743896, -0.10540714114904404, 0.012012324295938015 ]
104
106
A new X-ray outburst of the black-hole candidate 4U 1630-47
Rudy Wijnands (University of St Andrews), Ron Remillard (MIT), Jon M. Miller (CfA)
We report the detection of a new X-ray outburst of the recurrent X-ray transient and black-hole candidate 4U 1630-47. The All Sky Monitor aboard the Rossi X-ray Timing Explorer began detecting the source on or near 2002 September 10, when it rapidly rose to 0.3-0.4 Crab (2-12 keV) on 2002 September 13. This renewed activity of 4U 1630-47 follows its last outburst which started in 2000 November and lasted until 2001 June. During its 1998 outburst, the radio and possible IR counterparts of the source were detected (Hjellming et al. 1999, ApJ, 514, 383; Augusteijn et al. 2001, A&A, 375, 447; VLA radio position R.A.=16h34m01.60s +/- 0.05s, Dec.= -47 23' 33" +/- 2", equinox 2000). Therefore, observations of this source at all wavelengths are strongly encouraged.
2002-09-14 03:45:00
radio,infra-red,x-ray,binary,black hole,transient,request for observations
2002-09-14
03:45:00
767
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105
107
The recent evolution of radio emission from GX 339-4
Rob Fender (Amsterdam), Stephane Corbel (Paris VII & CEA Saclay), Tasso Tzioumis (ATNF), Steven Tingay (ATNF), Catherine Brocksopp (Liverpool John Moores), Elena Gallo (Amsterdam)
We report on the evolution of the radio emission from the black hole candidate GX 339-4, as observed with the Australia Telescope Compact Array (ATCA). These observations are associated with the re-appearance of GX 339-4 as a bright X-ray source following approximately three years in an "Off" state, and subsequent transition to the current extremely bright X-ray state. Three sets of observations between MJD 52368-52382 revealed a radio source with an approximately flat spectrum between 1 - 9 GHz, at a level between 5 - 14 mJy, characteristic of the low/hard X-ray state. The source subsequently brightened (and softened) dramatically in X-rays around MJD 52408, associated with which we have observed a rapid (hours) radio flare, during which GX 339-4 reached a peak flux density of approximately 50 mJy, the highest radio flux ever measured from this source. Subsequent ATCA observations revealed a decaying, optically thin spectrum until MJD 52483, when the radio flux was observed to have again increased to more than 15 mJy at 5 GHz, again with an optically thin spectrum. Since then this radio emission has faded, with a flux density of ~3 mJy recorded on MJD 52516, and has shown evidence of spectral steepening.
2002-09-19 19:38:00
radio,x-ray,black hole,transient
2002-09-19
19:38:00
1,227
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106
108
Follow-up radio observations of the black hole candidate 4U 1630-47
Diana Hannikainen (Univ. of Helsinki), Bob Sault (ATNF), Erik Kuulkers (ESA/ESTEC), Kinwah Wu (MSSL/UCL), Paul Jones (ATNF), Richard Hunstead (Univ. of Sydney)
Following the report of renewed X-ray activity from the black hole candidate 4U 1630-47 (ATEL #106) we observed the source with the Australia Telescope Compact Array (ATCA) with observation midpoints at 2002 September 16.3, September 19.4 and September 24.4 UT. On September 16, four of the six ATCA antennas observed 4U 1630-47 for 12 hours at 20/13 cm and 6/3 cm. On September 19 and 24 we used five and six antennas respectively at 3 and 6 cm. Imaging observations in I, Q, U, V were performed during all three runs. The source was not detected on any of the three observing dates. The 1-sigma detection limit was approximately 95, 180 and 180 microJy on September 16, 19 and 24 respectively, at both 3 and 6 cm. On September 16, confusion at 20 and 13 cm limited the image rms in the region of the source to 760 and 350 microJy respectively.
2002-09-28 03:22:00
radio,x-ray,black hole,transient
2002-09-28
03:22:00
847
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-0.03506997972726822, -0.025159694254398346, 0.030127424746751785, 0.015866488218307495, -0.034015778452157974, 0.06394876539707184, -0.0365116223692894, -0.10248676687479019, -0.0017432576278224587, -0.021805452182888985, -0.051443181931972504, 0.025298163294792175, 0.0033354759216308594, -0.0980452373623848, -0.04448673129081726, -0.0005646669887937605, 0.028237618505954742, -0.06592661142349243, -0.01201292872428894, 0.032641876488924026, 0.04664745181798935, -0.02677183412015438, -0.15653374791145325, -0.03019687533378601 ]
107
109
Rossi X-ray Timing Explorer observations of the black-hole candidate 4U 1630-47 during its 2002 outburst
Jeroen Homan (INAF-OAB) & Rudy Wijnands (University of St. Andrews)
After the detection of renewed X-ray activity from the recurrent X-ray transient and black-hole candidate 4U 1630-47 (ATEL #106), the source has been monitored frequently with the Rossi X-ray Timing Explorer (RXTE). We have analysed the publicly available RXTE observations performed during 12 and 26 September 2002 UT, resulting in ~19 ksec of on source time spread out over 13 observations. The X-ray flux (3-100 keV; unabsorbed) varied between 1.4 and 2.5E-08 erg/s/cm^2. The spectrum could be fitted with a disk black-body (with temperature of 1.4-1.6 keV) plus power-law model (with photon index of 2.3-3.2; contributing between 20 and 50% to the total flux). A weak trend was present suggesting that the temperature decreased and the photon index increased when the 3-100 keV flux decreased. The column density obtained (~ 1E23 cm^-2) from the fits was consistent with being constant during the observations. Light curves in the 3-60 keV energy range were characterized by strong flaring (increases/decreases by factors up to 2) on a time scale of tens to hundreds of seconds. The power density spectra are dominated by power law noise with a strength of 3-11 % rms (0.01-100 Hz) and an index of ~1.3. No QPOs were found. The spectral shape of 4U 1630-47 during our observations resembles those of other black-hole transients during their very high states (VHS). The strength and shape of the band-limited noise in the power density spectra is consistent with this interpretation. However, the black-hole VHS is usually identified also by the presence of QPOs which have not been detected during the described observations. Interestingly, during the 1998 outburst 4U 1630-47 entered a true VHS state during which QPOs were detected (Dieters et al. 2000, ApJ 538, 307; Trudolyubov et al. 2001, MNRAS 322, 309) *and* the source was detected at radio wavelengths (Hjellming et al. 1999, ApJ 514, 383). The absence of QPOs during the present candidate VHS in combination with the absence of radio emission during this outburst (ATEL #108) might suggest a possible connection between the QPO and the radio emission mechanisms. Further monitoring by RXTE and radio observations are needed to confirm this possible relation between radio emission and quasi-periodic variability during the VHS in 4U 1630-47.
2002-10-03 01:57:00
radio,x-ray,binary,black hole,transient
2002-10-03
01:57:00
2,309
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108
110
New outburst of SAX J1808.4-3658
C. B. Markwardt (U. Maryland & NASA/GSFC), J. M. Miller (CfA) & R. Wijnands (University of St. Andrews)
SAX J1808.4-3658 The authors report the discovery of a new outburst of the first known millisecond accreting pulsar SAX J1808.4-3658. In RXTE PCA scans of the galactic center performed on Oct 13.279 (UT), an X-ray source whose position is consistent with SAX J1808.4-3658 was detected with a flux of 65 mCrab (2-10 keV). On Oct 9.5 the PCA flux was less than 0.5 mCrab. Two minutes of pointed data were obtained, in which X-ray pulsations were detected at the frequency 400.953 +/- 0.008 Hz (barycentered). This frequency is consistent with the known pulsar spin frequency and orbital Doppler modulation. The RXTE ASM instrument detected the source on Oct 14.30 and 14.37 at fluxes of 105 and 76 mCrab, respectively. In its 1998 outburst, the source also exhibited fast radio and optical transients, and so multiwavelength observing is encouraged. Additional RXTE PCA observations are taking place.
2002-10-15 10:31:00
radio,optical,x-ray,binary,neutron star,pulsar,star,transient
2002-10-15
10:31:00
898
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109
111
New Transient XTE J1450-603
C. B. Markwardt (U. Maryland and GSFC), F. E. Marshall and J. H. Swank (GSFC)
C. B. Markwardt, University of Maryland and Goddard Space Flight Center (GSFC), F. E. Marshall and J. H. Swank (GSFC), report the serendipitous discovery of a new transient, designated XTE J1450-603, by the RXTE PCA during slews between planned targets on Nov 15.5 and 20.2 (UT). A dedicated PCA cross scan occurred on Nov 24.7. From a global solution of all PCA scanning data, we found a position of R.A. = 14h50m16s, Decl. = -60o16' (equinox 2000.0), with estimated 99-percent confidence error radii of 3' in R.A. and 5' in Decl. This position places it about 1 degree from the galactic plane, near Circinus X-1. A second dedicated RXTE observation occurred on Nov 27.9. The energy spectrum on Nov 27.9 was consistent with being smooth continuum, such as a power law with photon index 2.2, with no evidence of iron line emission beyond the galactic diffuse emission level. The X-ray flux ranged from 3.5 to 17 mCrab (2-10 keV), varying significantly on timescales of tens of minutes. A search for faster variations was performed, but no significant QPOs or pulsations were detected. At present, no further RXTE observations are scheduled.
2002-12-04 05:56:00
x-ray,binary,black hole,neutron star,star,transient
2002-12-04
05:56:00
1,140
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110
112
Follow-up radio observations of the field around the new transient XTE J1450-603
Bob Sault (ATNF), Diana Hannikainen (U. Helsinki), Tasso Tzioumis (ATNF), Kinwah Wu (MSSL/UCL)
We observed the field around XTE J1450-603 (ATel #111) with the Australia Telescope Compact Array on Dec 6.8 for 2 hours at 3 and 6 cm. Two sources were found: both are "faint" and are not listed in the PMN catalog. The flux (at 6 and 3 cm respectively) and position (J2000) of the sources are: The fluxes are corrected for primary beam effects. Source B shows a spectral index typical of background radio galaxies. Two subsequent observations of Source A give By centering the field of view on Source A, Source B was now outside the instrument field-of-view. No other sources were noted in the new field. We estimate a 3-sigma error of 1.2 mJy on the second and third observation. Poorer phase stability during the first observation makes us relucant to quote errors on these measurements: we do not rule out the apparent variability is a result of phase decorrelation. We conclude that Source A has not varied and so quite probably unassociated with the X-ray source.
2002-12-16 18:14:00
radio,x-ray,transient
2002-12-16
18:14:00
972
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111
113
New Transient, XTE J1730-318
R. A. Remillard, A. M. Levine, and E. H. Morgan (M. I.T.), E. Smith, and J. Swank (NASA GSFC)
We report the discovery of a transient X-ray source at (J2000) 17h19m58s, -31 46'.8 (estimated 3' uncertainty at 90% confidence). The source was first detected on 2003 January 9 when the average flux (2-12 keV) was 130 +- 20 mCrab. The intensity increased to 430 +- 40 mCrab on Jan. 10 and 400 +- 20 mCrab on Jan. 13. A brief observation of the ASM position on Jan. 14 with the RXTE PCA confirms the presence of a bright transient. More extensive observations with the PCA and HEXTE, including raster scans to improve the source position, are planned starting Jan. 15. The error circle does not contain any noteworthy sources in the Simbad catalogs. The ASM hardness ratios indicate that the spectrum was moderately hard Jan. 9-10 and relatively soft on Jan. 13. These results resemble the early spectral evolution of X-ray transients known to contain an accreting black hole. We encourage optical and radio observations of this new transient.
2003-01-15 05:05:00
radio,optical,x-ray,black hole,transient
2003-01-15
05:05:00
943
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112
114
Name Correction: XTE J1720-318
R. A. Remillard, A. M. Levine, and E. H. Morgan (M. I.T.), E. Smith, and J. Swank (NASA GSFC)
There was a typo in the title field of ATEL #113. The position and other information given in the text are correct, but the source name is XTE J1720-318., as correctly reported to vsnet and IAUC. Apologies to ATEL.
2003-01-15 08:24:00
x-ray,black hole,transient
2003-01-15
08:24:00
214
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113
115
Refined position and spectrum for XTE J1720-318
C. B. Markwardt (U. Maryland and GSFC)
I report further information on RXTE PCA observations of the new transient XTE J1720-318. Observations from 2002 Jan 15.06-15.10 were analyzed, the first 1500 ks of which contained a raster scan pattern, and remainder was pointed near the source position. From the raster scan portion of the data, I determine a best-fit position to be R.A.(J2000) = 17h20m00s, Decl.(J2000) = -31d44.8m. The estimated position error is likely to be dominated by systematic errors in the modeling process, with error radius in the 0.5 to 1 arcminute range. Based on the pointed data, the flux was determined to be 410 +/- 20 mCrab (2-10 keV). A very good spectral fit was achieved using an absorbed blackbody plus power law continuum model, with a temperature of 0.6 keV and photon index of 2.0 for each component respectively. The ratio of black body to power law fluxes in the 2-10 keV band was about 10 to 1. An iron line was present in the spectrum with an equivalent width of about 95 eV. The centroid energy was 6.2 keV, however the line is significantly broadened with a FWHM of 2.5 keV. Since no evidence of reflection or edges was seen, it is possible that the broadening is due to relativistic effects. Some variability on time scales < 1 Hz were detected, but no low or high frequency oscillations were found. XTE J1720-318 is approximately 6 degrees from the galactic center. If placed at the same distance, the 2-10 keV luminosity would be of order 10^{39} erg/s. This consideration, along with the spectral and timing properties, suggests that the sources is a black hole candidate in the so-called "high" state. RXTE will continue to observe the source.
2003-01-16 08:24:00
x-ray,binary,black hole,transient
2003-01-16
08:24:00
1,650
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114
116
Supernova 2002hi
D. Pooley and W. H. G. Lewin (MIT)
D. Pooley and W. H. G. Lewin, Massachusetts Institute of Technology, on behalf of a larger collaboration, report the detection of X-ray emission at the position of the type-IIn supernova (SN) 2002hi (IAUC 8006 ) with the Chandra X-ray observatory: An ACIS-S3 observation of 10 ks was made on Dec. 10.73. In the 0.5-10 keV range, we searched a 2x2 pixel region (approx. 1" by 1") around the reported position of the SN and detected 2 counts. Given an average background of 0.008 (+/- 10%) counts/pixel (based on a circular region of radius 30" around our search area), the binomial distribution gives a chance probability of the occurrence of 2 or more counts of 0.031%-0.046%. Based on the host galaxy's redshift of 0.061 (IAUC 8006 ) and a Hubble constant of 65 km/s/Mpc, a rough estimate for the absorbed X-ray luminosity of the SN is 2 x 10^{42} erg/s. It is unknown whether the host galaxy of SN 2002hi has an active nucleus, and, because of the proximity of the SN to the nucleus (within 1", IAUC 8006 ), we cannot exclude the possibility that some or all of this X-ray emission is from an active nucleus. About 1% of all galaxies have an active nucleus.
2003-01-18 05:05:00
x-ray,supernovae
2003-01-18
05:05:00
1,159
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115
117
Improved IR (ISAAC/VLT) and radio (ATCA) astrometry of the likely counterpart to XTE J1720-318
Kieran O'Brien (ESO, Chile), Fraser Clarke (ESO, Chile), Rob Fender (Amsterdam), Catherine Brocksopp (MSSL), Danny Steeghs (CfA), Rob Hynes (Texas) and Phil Charles (Southampton)
We report VLT observations (Proposal 270.D-5025) of the field of the newly discovered X-ray transient, XTE J1720-318 (ATEL #113), together with an improved radio position. We obtained a series of 60 Ks band images with ISAAC on VLT/UT1 on 21st Jan 2003 between UT 09:27 and UT 09:57. The combined image has a limiting magnitude of approx 20.2 and an image quality (FWHM) of 0.5". The proposed IR counterpart of Kato et al. (VSNET alert) is clearly detected, along with several fainter nearby sources (<2" sep.). The source has a Ks magnitude = 15.31 ± 0.03, consistent with the previously reported observation. By cross-correlating our image with the 2MASS catalogue (positional accuracy < 0.2"), the position in our IR image is found to be RA = 17:19:58.994, Dec = -31:45:01.25, with an uncertainty of 0.05" relative to 2MASS. By combining four observations of the radio counterpart to XTE J1720-318 at 8.64 GHz with the Australia Telescope Compact Array (ATCA) we arrive at the following refined radio position: RA = 17:19:58.985, Dec = -31:45:01.109 (J2000) with a total positional uncertainty of 0.25". This improved radio position (relative to IAUC # 8054 ) remains consistent with the aforementioned infrared counterpart, strengthening the case for an association. (see image at http://www.sc.eso.org/~fclarke/research/XTE1720/XTE1720.html ) We have also extracted Ks band lightcurves for this source and two other nearby candidates, but none show significant variability at the level of +- 0.1 mag. We strongly encourage further monitoring and spectroscopic observations of this relatively bright IR counterpart.
2003-01-23 22:40:00
radio,infra-red,x-ray,black hole,transient
2003-01-23
22:40:00
1,623
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116
118
Recurrent Transient X1901+031
D. Galloway, R. Remillard, E. Morgan (M. I.T.), and J. Swank (NASA GSFC)
We report a new X-ray outburst in a transient last seen in 1970-71 (Forman et al. 1976, ApJ 206, L29). The ASM position is R.A. = 19h03m33s, Decl. = +3 12'.4 (equinox J2000.0; estimated 3' uncertainty at 90% confidence). This position is within the 10' error box originally estimated for X1901+031, but is almost 10' away from the nearest ROSAT source, 1RXS J190411.9+031210. The current outburst appears to have begun on 2003 January 31 with a flux of 40(8) mCrab at 2-10 keV, rising to a steady flux of 130 mCrab on February 9 and 10. Brief followup observations with the RXTE PCA instrument on February 10 show pulsations with a period of 2.763 seconds. We encourage efforts to locate the optical counterpart, noting the likelihood of an optical companion with an early type spectrum or Be classification.
2003-02-13 01:18:00
optical,x-ray,binary,neutron star,pulsar,star,transient,request for observations
2003-02-13
01:18:00
808
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119
XMM-Newton followup of IGR J16318-4848
J. de Plaa, P. R. den Hartog, J. S. Kaastra, J. J. M. in 't Zand, M. Mendez and W. Hermsen (SRON National Institute for Space Research, Utrecht, The Netherlands)
We report a spectral analysis of the Febr. 10 TOO XMM-Newton observation of the new bright X-ray source IGR J16318-4848 (IAUC # 8063 ). During the 27 ks observation the source shows large variations in countrate by roughly a factor of 3 in both EPIC MOS2 and PN detectors. The MOS2 and PN spectra can simultaniously be reasonably well fitted by a powerlaw with photon index 0.9 +/- 0.4 and 3 lines with energies 6.410 +/- 0.003 keV, 7.09 +/- 0.02 keV and 7.47 +/- 0.02 keV. The neutral hydrogen absorption column density is extremely large with a value of (1.66 +/- 0.16) * 10^24 cm-2 (all errors are 90% confidence). The energies of the first two lines are consistent with K-alpha and K-beta emission from partially ionized Iron. The third line is consistent with K-alpha emission from partially ionized Nickel. The observed unabsorbed flux of the source is 1.9 * 10^-10 erg cm-2 s-1 over the 2 - 10 keV energy range.
2003-02-21 14:04:00
x-ray,transient
2003-02-21
14:04:00
918
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-0.04420653358101845, -0.0198472011834383, 0.008513765409588814, 0.05097807198762894, -0.07149693369865417, 0.039534155279397964, -0.03888070210814476, -0.03415815904736519, -0.006895863451063633, -0.02315889485180378, 0.01570998691022396, -0.06940972805023193, -0.06487766653299332, -0.1433500200510025, -0.10774720460176468, -0.008935021236538887, -0.0427955761551857, -0.05325218662619591, -0.035399969667196274, 0.008522603660821915, 0.14517486095428467, -0.062300290912389755, -0.10171853005886078, -0.04790165647864342 ]
118
120
State Transition of GX 339-4
D. M. Smith, E. Kalemci (Space Sciences Laboratory, U. C. Berkeley), J. A. Tomsick, W. A. Heindl (Center for Astrophysics and Space Science, U. C. San Diego)
The black hole candidate GX 339-4, in outburst for nearly a year (ATEL #85) has lately been declining rapidly in luminosity in the soft state and has now started to show signs of a transition to the low/hard state. We have been monitoring this source twice weekly with the Proportional Counter Array (PCA) on the Rossi X-ray Timing Explorer. As of 23 February, 17:30 UT, the power law component of the spectrum now dominates the 3-25 keV count rate. The root-mean-squared variability (beyond Poisson statistics) is low, only 2.4%, yet this is higher than has been seen in the soft state for the last few months. Radio and x-ray observations are particularly encouraged over the course of this week, which should find the source in a truly transitional phase.
2003-02-25 10:22:00
radio,x-ray,gamma ray,black hole,transient,request for observations
2003-02-25
10:22:00
758
[ -0.02070046216249466, -0.04807248339056969, 0.02143499255180359, 0.1202518418431282, -0.0196056105196476, -0.06249353662133217, -0.025422465056180954, 0.027221878990530968, 0.05991222709417343, -0.0618852935731411, -0.03865981474518776, -0.001235826755873859, 0.0014508794993162155, 0.007914175279438496, -0.03896114602684975, -0.005365585442632437, 0.03564203530550003, -0.12261215597391129, -0.0033841640688478947, 0.060732293874025345, 0.028760289773344994, 0.03748510405421257, -0.03588644787669182, 0.004311793949455023, 0.031069371849298477, -0.009319934993982315, 0.001132816425524652, -0.07776898890733719, 0.06872409582138062, -0.024457907304167747, -0.025777650997042656, 0.055282142013311386, 0.008419771678745747, -0.026269186288118362, 0.07718871533870697, 0.03753790631890297, 0.059947334229946136, 0.006694593466818333, -0.0023274363484233618, 0.03338299319148064, 0.006124570500105619, -0.05572546645998955, 0.018423769623041153, 0.06478992104530334, -0.06735078245401382, 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119
121
Improved position for the X-ray pulsar X1901+031
D. K. Galloway, R. Remillard, and E. Morgan (MIT)
We report an improved position for the recurrent X-ray transient X1901+031 (ATEL #118). Based on an RXTE/PCA scan on Feb. 12, we derive a position of R.A. = 19h03m37.083s, Decl. = +3 11 31.20 (equinox J2000.0; estimated 1' uncertainty at 90-percent confidence). This position is 1.3' away from the previous ASM position, and 9' away from the nearest ROSAT source, 1RXS J190411.9+031210. Measurements of the ~2.763 s pulse period between Feb. 10 and 25 show variations suggesting orbital modulations with a period of ~25 d or more. The ASM observations over the same time interval show a steady source with an average flux of 170 (5) mCrab and a hard spectrum (ratio of 5-12 keV to 3-5 keV ASM intensity = 2.6 (0.4)). RXTE observations are continuing.
2003-02-26 06:28:00
optical,x-ray,binary,neutron star,pulsar,star,transient,request for observations
2003-02-26
06:28:00
751
[ -0.09048613160848618, -0.0577092282474041, 0.007680014707148075, 0.027901874855160713, 0.029427213594317436, -0.04853016138076782, 0.019046295434236526, 0.07938378304243088, 0.0072591849602758884, -0.021197153255343437, -0.002435002475976944, 0.017664209008216858, 0.07243738323450089, -0.03579612448811531, 0.023236701264977455, -0.02928539365530014, 0.010325300507247448, -0.10058002173900604, 0.053837232291698456, 0.10736861079931259, -0.04299480468034744, 0.018293794244527817, -0.01596585102379322, 0.04131883755326271, 0.04588901624083519, 0.012842624448239803, -0.007212028838694096, -0.10847622901201248, -0.041767045855522156, -0.008017845451831818, 0.0672973096370697, 0.059928618371486664, -0.005044667981564999, -0.03242206946015358, -0.0023036464117467403, 0.037867531180381775, 0.059510789811611176, -0.04082310572266579, 0.014538900926709175, -0.04866544157266617, 0.022885769605636597, -0.030070751905441284, 0.011428579688072205, 0.017169782891869545, -0.023697538301348686, 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122
Discovery of a Fourth Accreting Millisecond Pulsar, XTE J1807-294
C. B. Markwardt (U. Maryland & GSFC), E. Smith (GSFC) & J. H. Swank (GSFC)
C. B. Markwardt, University of Maryland and Goddard Space Flight Center (GSFC), and E. Smith and J. H. Swank, GSFC, report that RXTE PCA monitoring observations of the galactic center region have revealed a new millisecond pulsar, designated XTE J1807-294. PCA cross scans on Feb 21.6 (UT) determined the position to be R.A. = 18h07m00s, Dec. = -29o24' (equinox 2000.0) with an uncertainty of approx. 1', due to the variable nature of the source and diffuse galactic emission. The Feb 21.6 observation also contained pointed data with a time baseline of 3600 s, during which coherent pulsations were detected at a barycentered frequency of 190.625 Hz. While the pointing is interrupted by scans, there appears to be a significant sinusoidal modulation of the pulse frequency, at a period of 35 +/- 3 minutes, and with a half-amplitude of 2.2 +/- 0.6 mHz. This source is the fourth known accreting millisecond pulsar, and the orbital period, if confirmed, is the shortest yet of that group. The r.m.s. pulse amplitude is approximately 7% (2-30 keV), consistent with previous such pulsars. The 2-10 keV X-ray fluxes on the following dates were (in mCrab): Feb 16.7, 33; 19.8, 38; 21.6, 58; 22.6, 41; 25.4, 32; which suggests that the X-ray peak has passed. The spectrum is consistent with a cut-off power law with an photon index of 2, and a hydrogen column density of 3 x 10**21 cm-2. Further RXTE observations are planned. Observations at other wavelengths are encouraged.
2003-02-26 10:55:00
x-ray,binary,neutron star,pulsar,star,transient,variables,request for observations
2003-02-26
10:55:00
1,472
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-0.019334038719534874, -0.057307761162519455, -0.007177851162850857, -0.09973850101232529, 0.040263108909130096, -0.011075121350586414, -0.06504752486944199, -0.032580528408288956, -0.030086517333984375, -0.02061230130493641, 0.002536440035328269, -0.018107494339346886, -0.14707516133785248, -0.024064920842647552, 0.02320154197514057, -0.021906500682234764, -0.024117454886436462, -0.03674788028001785, -0.054641496390104294, 0.03495179861783981, -0.038505397737026215, -0.1180255189538002, -0.00764057319611311 ]
121
123
Counterpart to XTE J0119-731
M. J. Coe and B. T. Gaensicke (Southampton University)
We report optical spectroscopic observations of the field of the new 2.16s X-ray pulsar in the SMC were carried out on the night of 7/8 February 2003, shortly after it was reported by Corbet et al in IAUC # 8064 on 3 February 2003. Two emission-line optical counterparts were first identified by searching the XTE error box using SIMBAD : [MA93] 1864 and Lin 526. Optical spectra were obtained on both these objects using the SAAO 1.9m telescope. The first brighter source, however, revealed no emission lines, whereas the second source, Lin 526, exhibited strong H alpha and H beta emission. The equivalent width of the H alpha was 40 +/- 5 Angstroms and this object is therefore proposed as the most likely counterpart to XTE J0119-731.
2003-02-27 00:45:00
optical,x-ray,binary,neutron star,pulsar,star,transient
2003-02-27
00:45:00
738
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122
124
Aquila X-1 Active Again
J. Swank(GSFC), E. Smith (GSFC), J. Miller (CfA), & R. Remillard (MIT)
The RXTE All Sky Monitor (ASM) detected a reactivation of the recurrent transient and bursting neutron star Aquila X-1 about 24 Feb 2003 at a level of about 43 mCrab (1.5-12 keV). The count has risen to a level of about 110 mCrab on 27 Feb 2003. A pointed observation with the Proportional Counter Array (PCA) at 18 UT 25 Feb 2003 found 70 mCrab with a spectrum approximately fit by a power law with photon index 2.
2003-02-28 04:40:00
x-ray,binary,neutron star,star,transient,request for observations
2003-02-28
04:40:00
415
[ -0.04322345182299614, -0.11179153621196747, -0.0021226133685559034, 0.10446397960186005, -0.03729696571826935, -0.004039779771119356, 0.05331247299909592, 0.043255433440208435, 0.014229543507099152, -0.016131116077303886, -0.014908294193446636, 0.01753837987780571, 0.08937909454107285, -0.06532198935747147, -0.026237232610583305, 0.047659337520599365, 0.04276470094919205, -0.13223719596862793, 0.05631202086806297, -0.006267597433179617, -0.03387252613902092, 0.006287533789873123, -0.0038089428562670946, 0.0522398017346859, -0.035716503858566284, -0.010285608470439911, 0.0054879323579370975, -0.05209864675998688, -0.001587704406119883, -0.11068817228078842, 0.04358379542827606, 0.07111257314682007, 0.030076658353209496, 0.05571821704506874, 0.029017269611358643, 0.04815058410167694, 0.0488569475710392, -0.037472859025001526, -0.06559665501117706, -0.03315660357475281, 0.019080370664596558, -0.020519008859992027, 0.0015852664364501834, 0.06525996327400208, 0.03328105807304382, 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123
125
Aql X-1 optical/IR outburst
D. Maitra(Yale), M. Buxton (Yale), S. Tourtellotte (Yale), C. Bailyn (Yale)
SMARTS consortium observations of Aql X-1 began on 02/26/2003 with the 1.3m telescope at CTIO + ANDICAM instrument. In the subsequent 5 days, the source brightened by ~1.2 mag in R and ~0.8 mag in J. We note that these measurements include light from the near neighbor star V1333 Aql (Chevalier et al., 1999, A&A, 347,L51). We thus confirm X-ray observations (ATEL #124) that the source is now in outburst.
2003-03-08 00:08:00
infra-red,optical,x-ray,binary,neutron star,star,transient
2003-03-08
00:08:00
406
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124
126
A New Outburst of 4U 1608-52
Jon M. Miller (CfA), Jean Swank, Evan Smith, and Craig Markwardt (GSFC)
On MJD 52710.2, the RXTE ASM found activity in the neutron star low-mass X-ray binary 4U 1608-52 at a level of 250 +/- 20 mCrab. Summing ASM dwells into one-day averages, 4U 1608-52 was first detected on MJD 52707.4 at a flux of 30 +/- 20 mCrab, rising to 100 +/- 20 mCrab on MJD 52708.5. Dwells today (MJD 52710) have measured fluxes as high as 290 +/- 20 mCrab. Observations at all wavelengths are encouraged.
2003-03-13 04:19:00
x-ray,binary,neutron star,star,transient
2003-03-13
04:19:00
411
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125
127
XTE J1807-294 - precise position and orbit determination
C. B. Markwardt (U. Maryland & GSFC), M. Juda (CfA), J. H. Swank (GSFC)
C. B. Markwardt, University of Maryland and Goddard Space Flight Center (GSFC), M. Juda, Harvard-Smithsonian Center for Astrophysics, and J. H. Swank, GSFC report that the Chandra X-ray Observatory observed XTE J1807-294 on Mar 10.8 (UT), and the best fit position was determined to be R.A. = 18h06m59.80s, Decl. = -29o24'30" (equinox 2000.0; uncertainty about 1"). On Mar 13.9, RXTE PCA measured a 2-10 keV x-ray flux of 20 mCrab. Pulsations are still detected, and a orbital Doppler modulation is clearly evident. The best fit orbital period is 40.0741 +/- 0.0005 minutes, confirming it as the shortest period of any of the four accreting millisecond pulsars. In light of the new x-ray position, optical observations are encouraged.
2003-03-16 23:21:00
optical,x-ray,binary,neutron star,pulsar,star,transient
2003-03-16
23:21:00
734
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126
128
RXTE PCA Snapshots of IGR J16318-4848 and IGR J19140+098
J. H. Swank (GSFC) & C. B. Markwardt (U. Maryland & GSFC)
RXTE carried out brief observations of the INTEGRAL sources IGR_J19140+098 (Hannikainen et al. 2003, IAUC 8088 )and IGR_J16318-4848 (Courvoisier et al. 2003, IAUC 8063 ; see also Murakami et al. 2003, IAUC 8070 and Schartel et al. 2003, IAUC 8072 ). No pulsations were identified from either. The data will be public. IGR_J16318-4848 was observed Mar 14.1-14.2 UT from an offset position, to avoid other sources. The source was steady. A consistent model flux contained 7e-11 ergs cm**-2 s**-1 2-10 keV and 3e-10 ergs cm**-2 s**-1 10-60 keV. This model (not unique) contained two power laws, one with photon index 1.7 and equivalent hydrogen column density of 1.3e24 cm**-2, the other with photon index of 5 and column of 1.3e23 cm**-2. A very strong Fe emission complex was present, as was found by Revnivtsev et al.(2003; astro-ph/0303274)in ASCA archival data. IGR_J19140+098 was observed Mar 10.8 UT. Significant irregular variability is present on time scales longer than 100 s. The spectrum is consistent with a power law of photon index 1.6 and hydrogen column 6e22. An Fe line complex with equivalent width of 550 eV was present. The fluxes in ergs cm**-2 s**-1 were 1e-10 2-10 keV and 2e-10 10-60 keV.
2003-03-18 10:50:00
x-ray,binary,black hole,pulsar,transient
2003-03-18
10:50:00
1,210
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127
129
A New Fast, Soft X-Ray Transient Discovered with the RXTE/ASM
D. A. Smith (U. of Michigan) & R. Remillard (MIT)
The All-Sky Monitor on RXTE has detected an unusually soft rapid X-ray transient that we designate XTE J1200+521. It was detected in nine consecutive observations, allowing the position to be constrained to a ~30' error box at 90% confidence (including an estimate of systematic error) with the following corners: RA: Decl: (J2000.0) 12h 00m 10s 5d 6'.0 12h 00m 36s 5d 21'.0 12h 00m 10s 5d 36'.0 11h 59m 36s 5d 21'.0 The X-ray transient was first detected on 2003 Mar 18 at 12:08:12 (UTC) at about 300+-40 mCrab in the A band (1.5-3 keV), and 250+-20 mCrab in the sum band (1.5-12 keV). There was no evidence for any x-ray emission from this location during the last previous observation at 10:40:28 (UTC), constraining the onset of the flare to a less than two-hour interval. The transient decayed smoothly during the nine observations, falling to an intensity of 90+-20 mCrab (1.5-12 keV) over thirteen minutes. Examination of the time series data yields no significant evidence for intensity variation on time scales of seconds. When the source was next observed at 13:51:40 (UTC), its sum-band intensity had fallen below a 2-sigma detectibility threshhold of around 50 mCrab (1.5-12 keV, 90 s exposure). The transient flare seems too long to be a normal Type I X-ray burst (or Gamma-Ray Burst) but too short to be one of the multi-hour "superbursts" seen from a few X-ray binaries (e.g. Kuulkers et al., A&A, 2002). It is much softer than other fast X-ray transients seen with the ASM such as V4641 Sgr or CI Cam (Bradt et al., 2000, astro-ph/0003438). It is also at an extremely high galactic latitude, 65 degrees north of the plane. It could be a very rapid stellar flare, such as that seen from AB Dor in only three ASM observations on 1998 Jun 09. A SIMBAD search of the error box reveals an unidentified ROSAT source, 1RXS J120011.2+051056, at 12h 00m 11s.20, +05d 10' 56".5, as well as a nearby, high-proper-motion G5 star, HD 104243, 12h 00m 14s.39, +05d 21' 48".7 (J2000.0). It is not possible from the ASM data to determine if either of these sources is a more likely candidate for the source of the soft X-ray flare. Observations at other wavelengths to determine if either of these sources is currently active are encouraged.
2003-03-19 01:58:00
x-ray,gamma ray,binary,gamma-ray burst,star,transient,request for observations
2003-03-19
01:58:00
2,246
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130
Soft X-ray Transient is Likely a Reflected Solar Flare
D. A. Smith (U. of Michigan) & R. Remillard (MIT)
It was pointed out to us that there was a solar flare measured by GOES, precisely consistant in both start time and duration with the flare seen in the ASM data. Given that the moon's position was within a half-degree of our best-fit position for the transient, we conclude that this event was most likely a solar flare reflected off the moon, and not an event originating outside our solar system. Thanks to David Smith for pointing out the contemporaneous solar flare.
2003-03-19 05:03:00
x-ray,transient,request for observations
2003-03-19
05:03:00
470
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-0.04273347929120064, -0.015426753088831902, 0.028501538559794426, 0.05086595192551613, -0.05532314255833626, 0.03839121758937836, -0.026268336921930313, -0.033115629106760025, 0.08336933702230453, -0.020785585045814514, 0.03483529016375542, -0.04746019095182419, 0.038146667182445526, -0.14119060337543488, 0.006715245544910431, -0.018374333158135414, -0.024824319407343864, -0.02838861383497715, 0.04345067963004112, 0.02281993068754673, 0.02082134783267975, -0.02409174293279648, -0.09207704663276672, -0.0020674574188888073 ]
129
131
IGR J16358-4726 in archival data of ASCA and BeppoSAX
M. Revnivtsev (MPA, Germany; IKI, Moscow), A. Lutovinov (IKI, Moscow), K. Ebisawa (ISDC, NASA/GSFC)
We report that our analysis of the archival data of ASCA and BeppoSAX observations revealed a weak X-ray source at position consistent with that of X-ray transient IGR J16358-4726 (IAUC # 8097 ). The source was seen in the ASCA observation on Feb.26, 1999 at the position: R.A.=16h35m53s, Dec.=-47o25.3' (equinox 2000, position uncertainty 0.8'). Preliminary analysis of the source spectrum shows that it has high value of photoabsorption, neutral hydrogen absorption column density could estimated to be ~1e23 cm^-2. The observed source flux is approximately 1e-12 erg/s/cm^2 (2-10 keV). The source was also seen in the BeppoSAX observation on Aug.8, 1999 at the position: R.A.=16h35m55s, Dec.=-47o26.0' (equinox 2000, position uncertainty 0.8'). Preliminary spectral analysis shows high photoabsorption consistent with ASCA results and the flux ~5e-13 erg/s/cm^2 (2-10 keV). Two other analyzed observations - Aug.6, 1998 and Sep.16, 1998 have not allowed to detect the source with the upper limit ~1e-13 erg/s/cm^2
2003-03-25 16:33:00
x-ray,binary,transient,request for observations
2003-03-25
16:33:00
1,016
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130
132
IGR J17464-3213
M. Revnivtsev (IKI, Moscow; MPA, Garching), M. Chernyakova (ISDC, Geneve), F. Capitanio (IAS, Rome), N. J. Westergaard (DSRI, Copenhagen), V. Shoenfelder (MPE, Garching), N. Gehrels(GSFC/NASA), C. Winkler (ESTEC, Noordwijk)
We report the discovery of a variable source with the ISGRI detector of the IBIS instrument onboard ESA's INTEGRAL satellite on March 21. The source position is R.A.=17h46.4m, Dec.=-32o13' (equinox 2000, position uncertainty 2'). The source flux increased by a factor of 3 from March 21 to March 26. Its flux averaged over March 24-26 is ~60 mCrab in the 15-40 keV energy range, 60 mCrab between 40-100 keV and 70 mCrab in the 100-200 keV energy range. In comparison with other transients, the spectrum is rather hard suggesting that the source is may be a black hole candidate. Observations in other bands are encouraged.
2003-03-29 02:05:00
x-ray,binary,black hole,transient,variables,request for observations
2003-03-29
02:05:00
622
[ -0.07854745537042618, 0.007265737745910883, -0.017610883340239525, 0.08552931249141693, 0.05898447707295418, -0.07212038338184357, -0.026959501206874847, 0.019902357831597328, 0.0634155422449112, -0.007252153474837542, -0.0748058333992958, -0.07929422706365585, -0.04912716522812843, -0.02320447564125061, -0.07368858903646469, -0.005401373375207186, 0.02306775562465191, -0.0380706749856472, -0.013459060341119766, -0.010554500855505466, -0.05107427015900612, 0.03264421597123146, -0.056479714810848236, 0.04003182426095009, 0.04836365208029747, -0.015388443134725094, -0.014534416608512402, -0.014483203180134296, 0.002770459046587348, 0.02282792329788208, -0.04080752655863762, 0.04057350009679794, -0.042639877647161484, 0.028491411358118057, 0.038836363703012466, 0.0523744598031044, 0.044336769729852676, -0.04063314571976662, 0.0215434767305851, -0.008923254907131195, 0.004686338827013969, -0.03633595257997513, 0.029663434252142906, -0.0003591801505535841, 0.004515110515058041, 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131
133
XTE J1746-322 = IGR J17464-3213 = H1743-322
C. B. Markwardt (U. Maryland & GSFC) and J. H. Swank (GSFC)
C. B. Markwardt (U. Maryland & GSFC) and J. H. Swank (GSFC) report the detection of a new source in RXTE PCA galactic bulge scans on MJD 52723.84, designated XTE J1746-322. The best fit position is R.A. = 17h46m30s, Decl. = -32o10' (equinox 2000.0), with approximate errors of 10', due to nearby confusing sources. This position is consistent with that of the newly reported INTEGRAL source IGR J17464-3213 (ATEL #132). A pointed RXTE observation occurred on MJD 52726.83 with total good exposure time of 3.4 ks. The mean fluxes in the 2-10, 15-40, and 40-100 keV bands were approximately 50, 200 and 220 mCrab respectively. Compared to the reported INTEGRAL fluxes, the intensity appears to have increased. A strong quasiperiodic oscillation with period ~20 sec, and r.m.s. amplitude ~25%, is clearly seen in the X-ray light curve. No coherent pulsations were detected. The X-ray spectrum is consistent with an absorbed power law with photon index 1.49 +/- 0.01 and an absorption column of 2.4 x 10**22 cm**-2. Signatures of compton reflection are apparent in the continuum spectrum, but there is no evidence for a line at 6.4 keV, with upper limit on the equivalent width of 45 eV (90 % confidence). The INTEGRAL source position is consistent, to within the cited 2' error bar, with the HEAO source H1743-322 (also known as H1741-322). The spectrum and timing properties suggest that it is indeed a black hole candidate.
2003-03-29 11:15:00
x-ray,gamma ray,binary,black hole,transient
2003-03-29
11:15:00
1,425
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132
134
New X-ray outburst of XTE J1550-564
Erik Kuulkers (ESA/ESTEC), Ron Remillard (MIT), Jon M. Miller (CfA)
E. Kuulkers (ESA/ESTEC), R. Remillard (MIT), and J.M. Miller (CfA), report that the renewed activity of XTE J1550-564 (IAUC # 8100 , CBET #12) is now also seen in the RXTE/ASM. The source started to appear around March 29. Between March 29 and 31 the 2-12 keV flux was between 40 and 65 mCrab, with a mean of 55+/-3 mCrab. The spectrum above ~5 keV is significantly harder than the Crab, consistent with the strong detection at hard X-rays with Integral (cf. IAUC # 8100 ). Since such an early start of a black-hole X-ray transient has been rarely observed, we strongly encourage observations at various wavelengths.
2003-03-31 22:11:00
x-ray,binary,black hole,transient,request for observations
2003-03-31
22:11:00
616
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133
135
Initial RXTE Observations of the 2003 Outburst of XTE J1550-564
Jon M. Miller (CfA) and Jeroen Homan (Oss. di Brera, Merate), on behalf of a larger collaboration
At present, we have obtained four observations of the current outburst of XTE J1550-564 with RXTE. The observations occurred on 27 March (2.2 ksec, 3.5 ksec), 29 March (2.9 ksec), and 30 March (1.9 ksec). Strong flaring, on several time scales, was observed in the light curves of all four observations. In the combined power spectrum of the four observations this shows up as three broad components; around 0.02 Hz (fractional rms amplitude of 28%), 0.5 Hz (25% rms), and 2.5 Hz (25% rms). These components are present in each of the four observations. The integrated rms variability between 0.001 and 100 Hz is 45 %, which is typical for the low/hard state. The lowest frequency component in our power spectrum could be related to the optical 1-2 min variability detected by Woudt et al. (IAUC. 8102) on 27 March. The short optical flare they reported may in turn be related to one of the short (<16 s) flares, which we observed during our 27 March RXTE observations. We examined background-subtracted spectra from the PCU-2 and HEXTE-A detectors (in the 3-25 keV and 20-250 keV bands, respectively; we also assumed N_H = 9.0 E+21 cm^-2). The time-averaged spectra are extremely hard, also consistent with the low/hard state. The source is easily detected out to 250 keV even in these short exposures. We find no evidence for an accretion disk component; this may only indicate that the disk is relatively cool in this stage of the outburst. Simple power-law and cut-off power-law models do not give acceptable fits. A model consisting of an Fe K line (the "Laor" model; E = 6.4 keV, EW = 200 eV) and neutral reflection ("pexrav"; Gamma = 1.4, E_fold = 400 keV, Omega/2*pi = 0.3) gives acceptable fits. The unabsorbed 3-250 keV flux in the most recent observation is 7.1 E-9 erg/cm2/s.
2003-04-02 01:06:00
optical,x-ray,binary,black hole,transient
2003-04-02
01:06:00
1,787
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134
136
Clarification on the association between IGR J17464-3213 and H1743-322
C. B. Markwardt (U. Maryland & GSFC) and J. H. Swank (GSFC)
In ATEL #133, we commented that newly reported INTEGRAL transient IGR J17464-3213 (ATEL #132) may be HEAO source H1743-322 (also known as H1741-322). The most commonly known position for H1743-322 is taken from the HEAO A-1 catalog (Wood et al. 1984, ApJS, 56, 507). However, there are in fact two candidate positions for the source, as determined by the HEAO A-3 instrument (Gursky et al. 1978, ApJ, 223, 973), both equally likely. The Wood et al. A-1 catalog reports the western position. The eastern Gursky position is R.A. = 17h46m16.80s, Decl. = -32o14'7" (equinox 2000.0; approx uncertainty < 1'). It is this position which is consistent with the reported INTEGRAL position.
2003-04-02 11:01:00
x-ray,binary,black hole,transient,a comment
2003-04-02
11:01:00
682
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135
137
Radio counterpart to IGR J17464-3213 = XTE J17464-3213
M. P. Rupen, A. J. Mioduszewski, and V. Dhawan (NRAO)
M.P. Rupen, A.J. Mioduszewski, and V. Dhawan (National Radio Astronomy Observatory [NRAO]) report the detection of a probable radio counterpart to the the X-ray transient and black hole candidate IGR J17464-3213 = XTE J17464-3213 (ATEL #132; ATEL #133). Observations with the Very Large Array (VLA) on 30 March and 1 April 2003 UT show a compact, variable source at 17 46 15.61 +/- 0.01s, -32 13 59.9 +/- 1" (J2000), roughly two arcminutes from the original INTEGRAL position, and consistent with the position of H1743-322 (ATEL #136). The source was about 4 mJy on 30 March, and had brightened by about 50% on 1 April, while retaining a flat or somewhat rising radio spectrum. Further radio observations are planned, and observations at other wavelengths are urgently requested.
2003-04-03 01:46:00
radio,x-ray,gamma ray,binary,black hole,transient,variables,request for observations
2003-04-03
01:46:00
779
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136
138
RXTE ASM Observations of H1743-322 = IGR J17464-3213
Ron Remillard (MIT) for the ASM team at MIT and NASA/GSFC
Observations of this X-ray transient with the RXTE All-Sky Monitor determines a position (to 0.1 degrees) that is consistent with the INTEGRAL source (ATEL #132), the XTE PCA source (ATEL #133), and the radio source (ATEL #137). Furthermore, all of these positions are consistent with the eastern choice of the two allowed error boxes derived by HEAO-1 instruments for H1743-322 during its 1977 outburst (Gursky et al. 1978, ApJ, 223, 973), as explained in ATEL #136. The average ASM flux (2-12 keV) during 2003 April 2 is 170 (7) mCrab, compared to 140 (5) mCrab on the previous day. The X-ray spectrum remains harder than the Crab Nebula but softer than classical X-ray pulsars.
2003-04-03 06:48:00
radio,x-ray,black hole,pulsar,transient
2003-04-03
06:48:00
680
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IGR J17464-3213 = XTE J17464-3213: Request for IR Observations
M. P. Rupen, A. J. Mioduszewski, and V. Dhawan (NRAO)
We report further radio observations of the X-ray transient and black hole candidate IGR J17464-3213 = XTE J17464-3213 (ATEL #132; ATEL #133; IAUC 8105 ) from the Very Large Array (VLA). The source continues to brighten, and appears now to be doubling in flux density every two days. Observations on 4 April 2003 UT give flux densities of 20.0+/-0.2 mJy at 4.9 GHz, and 22.1+/-0.2 mJy at 8.5 GHz. The radio spectrum has remained remarkably constant at nu^+0.2, characteristic of optically-thick synchrotron emission. If this spectrum continues into the near infrared, as expected in some jet models (e.g. Markoff et al. 2003 A&A 397, 645), the K band magnitude would be between 9th and 11th. Even with 2-3 magnitudes of K band extinction (based on the X-ray absorption column density, ATEL #133), this should be easily detectable. Even upper limits would be very useful indeed, in constraining these models, and in showing whether there is a chance that some of the X-ray emission is synchrotron. Such associated infrared emission has already been observed in some sources (e.g., GRS 1915+105, Fender & Pooley 1998, MNRAS 300, 573; GX 339-4, Corbel & Fender 2002, ApJL 573, L35), but never before in combination with such a stable and slow flux increase. One expects rapid variations, simply because the size of the emitting region is so small, if the flat spectrum is due to synchrotron self-absorption. Simple calculations give sizes of order or less than a few tenths of a milliarcsecond; this corresponds to a few 10s of light-minutes at the distance of the Galactic center, so one might hope to see significant variations in some 10s of minutes in the near IR. We therefore urgently request infrared observations of this source, as soon as possible. The radio spectrum has held steady for about a week, and the flux density seems only to increase, but this is unlikely to continue for long. The best position so far (from the VLA, IAUC 8105 ) is
2003-04-05 05:08:00
radio,infra-red,x-ray,gamma ray,binary,black hole,transient,request for observations
2003-04-05
05:08:00
1,950
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140
Optical observations of IGR J17464-3213
I. Khamitov, M. Parmaksizoglu (TUG), M. Revnivtsev (IKI, MPA), I. Bikmaev, N. Sakhibullin (KSU, AST), R. Sunyaev, M. Pavlinsky (IKI), Z. Aslan, O. Golbasi (TUG)
We made optical observations of X-ray transient IGR J17464-3213 = H1743-322 in I-filter by using 1.5-m Russian-Turkish telescope RTT150 at Bakyrlytepe (TUBITAK National Observatory, Turkey) in the night 5/6 April 2003. Search for the source at the radio position, reported by Rupen et al. (ATEL#137,IAUC # 8105 , ATEL#138), gave only marginal detection of a weak source at the level of I~20. Coordinates of this source are R.A.=17h46m15.6s, Dec=-32o14'01.2'' (equinox 2000, position uncertainty 0.5 arcsec). Image of the field could be found at http://hea.iki.rssi.ru/~mikej/INTEGRAL/igrj17464_rtt150_apr5_I.gif Further optical observations are planned
2003-04-07 00:08:00
radio,infra-red,optical,x-ray,binary,black hole,nova,transient,request for observations
2003-04-07
00:08:00
652
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139
141
IGR/XTE J17464-3213: Magellan optical upper limits
D. Steeghs, J. M.Miller (CfA), D. Kaplan (Caltech), M. Rupen (NRAO)
We report optical observations of the field of the transient IGR/XTE J17464-3213 using the Magic CCD camera on the Magellan-Clay telescope at Las Campanas Observatory. Johnson R and I-band images obtained on April 5 2003 with an image seeing of 0.5" reveal no optical counterpart at the radio position reported by Rupen et al. (ATEL #139) down to I~26 and R~26.5. We spatially resolve the emission reported by Khamitov et al. (2003, ATEL #140), and attribute their 'weak source' to a superposition of several background sources. A close-up of the Magellan image corresponding to roughly the HEAO error box width is linked below for comparison. Using the Schlegel et al. (1998, ApJ 500, 525) extinction maps, the extinction is estimated to amount to 6.7 mags in the I-band thus setting a de-reddened upper limit of I>19 to any optical counterpart. The RXTE-measured N_H (Markwardt & Swank 2003, ATEL #133) would give a larger extinction (9.7 mags in I). However, this is not a parameter which RXTE can measure well and we regard estimates from Schlegel et al. (1998) to be more accurate. The jet models proposed to describe the broad-band spectrum of, for example, GX 339-4 (Markoff et al. 2003, A&A, 397, 645) include many spectral components, such as pre-shock and post-shock jet synchrotron emission. For most of the models considered, predictions for either jet synchrotron components in I are within an order of magnitude of the radio flux densities. Extrapolating the VLA observations obtained the morning before our observations, and assuming the same power-law index (Rupen, Miduszewski, and Dhawan 2003, ATEL #139), a de-reddened I magnitude of 11.3 would have been expected. Our I-band limits are thus three orders of magnitude fainter than this extrapolation and appear to rule out similar models for IGR/XTE 17464-3213. In this particular case at least there is no evidence for optically thick jet emission extending to the IR. More recent VLA observations obtained on Sunday morning show a similar flux density at 4.9 GHz compared to Friday morning (~20 mJy). However, the spectrum from 4.9 to 8.5 to 43 GHz has changed slope to nu^=-0.05 as opposed to nu^+0.2 suggesting that the source is starting to fade. These latest radio pointings would result in an extrapolated I-band magnitude of I=12.9 as opposed to I=11.3 derived from the Friday morning VLA data. Magellan image: http://hea-www.harvard.edu/~dsteeghs/IGR1746_Magellan_I_zoom.gif
2003-04-08 06:10:00
radio,infra-red,optical,x-ray,gamma ray,binary,black hole,transient
2003-04-08
06:10:00
2,452
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140
142
Strong radio flare in XTE J1746-322 = IGR J17464-3213
M. P. Rupen, A. J. Mioduszewski, and V. Dhawan (NRAO)
We report a strong radio flare from the X-ray transient and black hole candidate XTE J1746-322 = IGR J17464-3213 (ATEL #132; ATEL #133) = H1743-322 (ATEL #136; ATEL #138; IAUC 8105 ). Observations with the Very Large Array (VLA) on April 6 and 8 2003 show the source increased in flux density by almost a factor 5 at 4.9 GHz, from 20.1+/-0.3 to 96+/-2 mJy. The radio spectrum also steepened from roughly flat on April 6, to sharply falling with frequency on April 8. The April 8 spectrum is not however well fit by a single power law, as there is substantial excess emission at the higher frequencies. This suggests there are several overlapping components, e.g. an extended, steep-spectrum jet and a compact, flat-spectrum core; it also indicates on-going activity, and the possibility of further radio flares developing.
2003-04-09 09:09:00
radio,x-ray,gamma ray,binary,black hole,transient,request for observations
2003-04-09
09:09:00
822
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141
143
SLX 1746-331
C. B. Markwardt (U. Maryland & GSFC)
C. B. Markwardt (U. Maryland & NASA/GSFC) reports the detection of a source in the galactic center region with RXTE PCA bulge monitoring scans, whose position is consistent with that of SLX 1746-331 (Skinner et al. 1990, MNRAS, 243, 72). This position is quite distinct from that of the recently-active IGR J17464-3213 (= XTE J1746-322 = H1743-322), which lies 1.2 degrees to the north. Previous transient outbursts of SLX 1746-331 have been seen in 1985 and 1990. Both Skinner et al. (1990) and White and van Paradijs (1996, ApJL, 473, L25) speculate that SLX 1746-331 contains a black hole, based on its transient nature and its soft spectrum (optically thick, kT ~ 1 keV). Indeed, a pointed observation of the source on Apr 7.99 (UT) with the PCA detected a very soft spectrum, consistent with "disk" black body emission (kT_BB = 1.3 keV). Motch et al (1998, A&AS, 132, 341) identify the source from the ROSAT All-Sky Survey as RX J1749.8-3312 = 1RXS J174948.4-331215, whose coordinates are R.A. = 17h49m50.6s, Decl. = -33d11m55s (equinox 2000.0). Approximate 2-10 keV X-ray fluxes were: Apr 5.65, 40 mCrab; Apr 7.99, 160 mCrab; Apr 8.65, 210 mCrab. As the flux is rapidly rising, observations at other wavelengths are desireable. I am requesting further observations with RXTE.
2003-04-09 11:09:00
x-ray,binary,black hole,transient,request for observations
2003-04-09
11:09:00
1,284
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142
144
ASM Observations of SLX 1746-331
R. A. Remillard and A. M. Levine (ASM team at MIT and GSFC)
The RXTE All-Sky Monitor has also detected continuously increasing flux from a position coincident with that of SLX 1746-331 (ATEL #143) during 2003 April 6-9. On April 9.36 the X-ray intensity was near 270 mCrab (2-12 keV). There has been some spectral hardening (3-12 keV) on April 8 and 9, compared with results on April 7.
2003-04-09 23:27:00
x-ray,transient
2003-04-09
23:27:00
326
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143
145
INTEGRAL observation of SLX1746-331
A. Lutovinov (IKI, Moscow), P. Kretschmar (ISDC, Geneva), C. Budtz-Joergensen (DSRI, Copenhagen), A. Domingo (LAEFF, Madrid),V. Schoenfelder (MPE, Garching), G. Palumbo (Universita degli Studi di Bologna), C. Winkler (ESTEC, Noordwijk).
We report the detection with the JEM-X telescope of the INTEGRAL observatory of a transient source SLX1746-331 in the galactic center region. This outburst was first reported by RXTE (ATEL #143, #144). The source was detected during a routine scan of the Galactic Plane on Apr 8 with a flux of ~200 mCrab in the 3-10 keV energy of JEM-X. No significant variability was measured during the ~37 min of observation. The spectrum of the source is well described by a disk black-body model with a temperature of kT~1.3 keV. A preliminary analysis has shown a possible presence of a hard component in addition to the thermal emission above 12 keV. An upper limit of ~15 mCrab was obtained from the ISGRI detector of the IBIS telescope of the INTEGRAL observatory in the 15-40 keV band, which is compatible with the JEM-X results. If the hard power law component is present in the spectrum of the source it can not contribute more than 10% of the source flux in the 5-40 keV band. Previously INTEGRAL has observed the field of SLX1746-331 on March 21st. The source was not detected in this observation and only a upper limit of 12 mCrab to its flux was obtained in the 3-10 keV band.
2003-04-11 02:04:00
x-ray,gamma ray,transient
2003-04-11
02:04:00
1,178
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144
146
IGR/XTE J17464-3213: New radio position and optical counterpart
D. Steeghs, J. M.Miller (CfA), D. Kaplan (Caltech), M. Rupen (NRAO)
Taking into account all VLA observations of this source up to April 8, we have obtained a revised radio position for IGR/XTE J17464-3213; 17 46 15.608 +/- 0.17" -32 14 00.6 +/- 0.5" (J2000) This is 0.7" south of the position reported in IAUC 8105 bringing the VLA position closer to a nearby optical counterpart present in Magellan I and R-band images (ATEL #141). This possible counterpart is consistent with the K-band source reported by Baba et al. 2003 (IAUC 8112 ). Our images with a spatial sampling of 0.069"/pixel resolve the K-band emission into three distinct point sources. The north-east component position is 17:46:15.57 -32:14:00.88 (J2000) in the USNO frame and was found at I=19.3, R=21.9 in our April 5 images. The reported K magnitude is in line with the Schlegel et al. (1988) extinction estimate (E(B-V)=3.48, N_H=1.7E22) and suggests a de-reddened I band magnitude of 12.6 for this candidate. Extrapolation of nearly contemporaneous radio flux levels amount to I~11.3. The brightness of this counterpart candidate is thus within an order of magnitude of jet model predictions as applied to e.g. GX339-4 (Markoff et al. 2003). The source is unresolved under 0.5" seeing conditions. Given the continued radio activity, further optical/IR observations to establish variability are encouraged. New image: http://hea-www.harvard.edu/~dsteeghs/IGR1746_Magellan_I_new.gif
2003-04-11 02:19:00
radio,infra-red,optical,x-ray,gamma ray,black hole,transient,request for observations
2003-04-11
02:19:00
1,391
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145
147
A New X-Ray Transient Discovered with XMM
L. Sidoli (IASF/CNR, Milan), S. Mereghetti (IASF/CNR, Milan)
A new transient X-ray source in the Galactic Center Region has been discovered with EPIC in a XMM-Newton observation performed on March 12 2003. The position of the source is RA (J2000.0)=17 47 16.0 Dec (J2000.0)=-28 10 45 with an uncertainty of 5 arcsec. The source spectrum can be fit with an absorbed powerlaw with photon index 2.1+/-0.1 and Nh=(8.9 +/- 0.5)x10^22cm-2. The large absorption suggests a source located at the galactic center distance.For a distance of 8 kpc, the source luminosity is about 5x10^34 ergs/s (2-10 keV,corrected for the absorption). The source was not visible in a shorter EPIC observation performed on 2000-09-23, implying a flux at least a factor 80 fainter.
2003-04-14 20:11:00
x-ray,transient
2003-04-14
20:11:00
691
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146
148
XTE J1807-294: Modulation of the pulsed flux with a refined spin period and orbit parameters
M. G.F. Kirsch (ESA XMM-SOC), E. Kendziorra (IAATuebingen)
The accreting millisecond pulsar XTE J1807-294, discovered by RXTE on February 21 (Markwardt et al., IAUC 8080 ), was observed by XMM-Newton March 22, 2003 under ObsId 01579601 in revolution number 0601. The observation started on 2003-03-22T13:40:27Z. The EPIC pn-CCD camera was operated in Timing mode with the thick filter, while the two MOS cameras were in Small Window mode(MOS1) and Full Frame mode(MOS2). For this analysis only data from the 9.293 ks long pn exposure were used. The count rate in 9 CCD columns (~ 37 arcsec) centred on the source was 33 cts/s in the 0.5-10 keV band (~ 3.7 mCrab). This compares to a background of 0.4 cts/s for a region of the same size. Using the best fit orbital period of 40.0741 +/- 0.0005 minutes found by Markwardt et al. (ATEL #127) we grouped the events into 20 phase bins of the binary orbit. Chi-square maximum epoch folding on individual phase bins revealed a clear modulation of the spin period. Assuming, in first approximation, a circular orbit, we derived 4.8 +/-0.1 light-ms for the projected orbital radius. The barycentric mean spin period of the pulsar was found at 5.2459427 +/- 0.0000004 ms. The modulation is seen over the entire energy band from 0.5 to 10 keV. The pulse profile shows a single peak (~ 1.5 ms FWHM), its shape varies only slightly with energy. The combined pulse profile in the 0.5-10 keV band shows a modulation of 6.0 +/- 0.1 percent (90-percent confidence level). We note that the results of our timing analysis of EPIC pn-CCD data are different from those recently published by Campana et al. (IAUC 8113 ).
2003-04-17 01:04:00
x-ray,binary,neutron star,pulsar,star,transient
2003-04-17
01:04:00
1,590
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147
149
IGR J17091-3624
E. Kuulkers (ESA/ESTEC), A. Lutovinov (IKI, Moscow), A. Parmar (ESA/ESTEC), F. Capitanio (IAS, Roma), N. Mowlavi (ISDC), W. Hermsen (SRON, Utrecht)
We report the discovery of a new transient source with the IBIS/ISGRI detector onboard the INTEGRAL observatory, which we designate as IGR J17091-3624. The source position is RA=17h09.1m and DEC=-36o24m38s (equinox J2000, uncertainty ~3'). The source was first seen during a pointed observation between UT 2003 April 14 00:20 and April 15 06:12 with a flux of about 20 mCrab in the 40-100 keV energy band. The source was not evident in the 15-40 keV band with an upper limit of about 10 mCrab, and shows the source exhibited a hard spectrum at that time. During subsequent pointings of the Galactic Center Deep Exposure between UT 2003 April 15 14:25 and April 16 09:06 the source flux had increased to about 40 mCrab and 25 mCrab in the 15-40 and 40-100 keV band, respectively, showing a considerable softening of the source spectrum. The source did not appear in both energy bands in a pointed observation a week earlier (UT 2003 April 6 15:41 - April 7 14:20), with upper limits of typically ~10 mCrab. We encourage follow up observations at various wavelengths.
2003-04-20 00:56:00
x-ray,gamma ray,transient,request for observations
2003-04-20
00:56:00
1,068
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148
150
IGR J17091-3624 in archival data of MIR/KVANT/TTM
M. Revnivtsev, M. Gilfanov, E. Churazov, R. Sunyaev (IKI, Moscow; MPA, Garching)
We report that analysis of archival data of TTM telescope aboard KVANT module of MIR orbital station revealed the detection of recently discovered X-ray source IGR J17091-3624 (ATEL#149) in several subsequent observations performed on Oct.1-10, 1994. The source position was determined as R.A.=17h09m06s, Dec.=-36o24'07" (equinox 2000, error radius about 0.8') that is within 0.6' from published INTEGRAL position. Source was detected at the flux level of 10 mCrab.
2003-04-20 01:23:00
x-ray,binary,transient,request for observations
2003-04-20
01:23:00
465
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149
151
IGR J18539+0727
A. Lutovinov (IKI, Moscow), J. Rodriguez (CEA, Saclay), N. Produit (ISDC), N. Lund (DSRI, Copenhagen), W. Hermsen (SRON, Utrecht), R. Much (ESA/ESTEC)
We report the discovery with the IBIS/ISGRI detector onboard the INTEGRAL observatory of a new transient source IGR J18539+0727. The source was detected during a routine scan of the Galactic Plane and deep observations of GRS1915+105 field on April 17-18. Its position is RA=18h53.9m and DEC=+7o27m (equinox 2000, position uncertainty ~3'). It seems that the source has a rather hard spectrum and its detected flux is ~20 mCrab in both, 15-40 keV and 40-100 keV energy bands. The source did not appear in either of the energy bands in observations on the same field on April 1, with upper limits ~5 mCrab. We encourage follow up observations at various wavelengths.
2003-04-21 20:34:00
x-ray,gamma ray,transient,request for observations
2003-04-21
20:34:00
667
[ -0.14268039166927338, 0.03222321346402168, -0.01011716015636921, 0.052616577595472336, 0.11519700288772583, -0.08167281746864319, 0.003962903283536434, 0.045425865799188614, 0.045967984944581985, -0.03195016086101532, -0.03854105994105339, -0.06220453232526779, -0.019655365496873856, -0.033453568816185, -0.05004241690039635, -0.040671832859516144, 0.08262332528829575, -0.06392116844654083, 0.007925726473331451, -0.018706027418375015, -0.05232870206236839, 0.03251873329281807, -0.017258668318390846, 0.012273494154214859, 0.049264922738075256, 0.010670849122107029, -0.002558936830610037, -0.03842315822839737, 0.00638194615021348, -0.015838123857975006, 0.06482115387916565, 0.08060412108898163, -0.028712771832942963, 0.0372878834605217, 0.03586893528699875, 0.05811167135834694, 0.06382207572460175, -0.0164457056671381, 0.10086627304553986, -0.013587454333901405, -0.009040508419275284, -0.035506125539541245, 0.047649867832660675, -0.0003819469711743295, -0.014331989921629429, 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150
152
Possible radio counterpart to IGR J17091-3624
M. P. Rupen, A. J. Mioduszewski, V. Dhawan (NRAO)
Observations with the Very Large Array (VLA) at 4.9 GHz show a possible radio counterpart to IGR J17091-3624, with a flux density of 1.9+/-0.3 mJy, and a J2000 position of
2003-04-23 23:38:00
radio,x-ray,gamma ray,transient,request for observations
2003-04-23
23:38:00
171
[ -0.018640251830220222, 0.06855925172567368, -0.10814396291971207, 0.008082807064056396, -0.005380280315876007, -0.04326685145497322, 0.00927041471004486, 0.015499955043196678, -0.06918134540319443, -0.04394309222698212, -0.025428075343370438, 0.0026670293882489204, -0.03542531654238701, 0.04084917902946472, 0.029168101027607918, -0.03502659499645233, 0.09152038395404816, -0.018425097689032555, 0.021915994584560394, -0.011913497000932693, -0.05086377263069153, 0.06717334687709808, -0.014414127916097641, -0.09057536721229553, 0.10168951749801636, -0.000651790585834533, 0.06763515621423721, 0.01550536323338747, -0.008750295266509056, -0.08165515214204788, 0.013381008990108967, 0.02322966791689396, 0.017738061025738716, 0.02862662822008133, -0.021147405728697777, -0.061397355049848557, -0.059108469635248184, 0.017008503898978233, 0.08782101422548294, 0.02613164111971855, -0.01935909502208233, 0.011535576544702053, 0.02351614460349083, -0.02748078480362892, -0.06981289386749268, 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151
153
INTEGRAL detection of Hard X-ray emission from XTEJ1720-318
P. Goldoni (SAp/CEA, Saclay), A. Goldwurm (SAp/CEA, Saclay), E. Kuulkers (ESA/ESTEC), A. Parmar (ESA/ESTEC), C. Budtz-Joergensen (DSRI, Copenhagen), G. Palumbo (Universita' degli studi di Bologna), J. P. Roques (CESR, Toulouse), R. Sunyaev (IKI, Moscow;MPA Garching), P. Favre (ISDC, Geneva)
We report the detection of the soft X-Ray transient XTE J1720-318 (ATEL #113, ATEL #115) with the IBIS/ISGRI instrument onboard the INTEGRAL observatory during routine scans of the Galactic Center region and two pointed observations of the source IGRJ1746-3213(=H1743-322), all performed in April. The source started to be active at energies higher than 40 keV around March 30, reached a level of ~25 mCrabs and ~30 mCrabs in the 15-40 and 40-100 keV bands, respectively, on April 6 and 7, and was then detected at approximately the same level between April 15 and 16. On these occasions a positive detection was also recorded at energies between 100 and 200 keV indicating a hard spectrum. On April 15 and 16 its 4-18 keV flux was estimated to be smaller than 20 mCrab with the JEM-X X-ray monitor. During a previous dedicated INTEGRAL observation of XTE J1720-318 on February 28, the source was not detected with IBIS/ISGRI above 40 keV and was only marginally visible between 15 and 40 keV at an estimated flux of 2-4 mCrab. At that time it was observed at a level of ~100 mCrab with ASM/RXTE in soft (2-12 keV) X-ray band. These observations suggest that the source has undergone a transition from a high/soft to a low/hard state, typical of later stages of black hole X-ray transients outbursts, when compact radio jets are often observed. Multiwavelength observations are encouraged.
2003-04-25 02:02:00
radio,x-ray,binary,black hole,transient,request for observations
2003-04-25
02:02:00
1,389
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152
154
IGR J18325-0756
Lutovinov A. (IKI, Moscow), Shaw S. (ISDC/Southampton), L. Foschini (IASF/CNR, Sezione di Bologna), J. Paul (CEA, Saclay)
We report the discovery of a new transient source, IGR J18325-0756, with the IBIS/ISGRI detector onboard the INTEGRAL observatory. Its position is RA=18h32.5m and Dec=-07o56m (equinox 2000, position uncertainty ~3'). The source was first detected during observations of the Galactic Centre field performed between April 23 UT 00:08 and April 25 UT 11:34, with fluxes ~10 mCrab in the 15-40 keV band and ~5 mCrab in the 40-100 keV band. Its flux increased by a factor of 1.5 in both energy bands during similar observations performed between April 25 UT 23:50 and April 27 UT 07:54. Between UT 08:20 - 08:50 on April 27 the source flux increased further up to an intensity of ~40 mCrab and ~25 mCrab in the two respective energy bands. Immediately afterwards the source flux drops to the values measured on April 23-25 and remained so till April 28 UT 04:00. We encourage follow up observations at various wavelengths.
2003-04-28 21:20:00
x-ray,gamma ray,transient,request for observations
2003-04-28
21:20:00
919
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153
155
IGR17597-2201 and AX1820.5-1434
A. Lutovinov (IKI, Moscow), R. Walter (ISDC), G. Belanger (CEA, Saclay), N. Lund (DSRI), S. Grebenev (IKI, Moscow), C. Winkler (ESA/ESTEC)
We report the discovery of a new transient source IGR J17597-2201 with the IBIS/ISGRI detector onboard the INTEGRAL observatory. Its position is RA=17h59.7m and Dec=-22o01m (equinox 2000) with uncertainty ~2'. The source was detected during several deep observations of the Galactic center field. The measured flux in a 15-40 keV energy band was ~5 mCrab (signal to noise ratio S/N ~ 10) during observation on March 30-April 1 and increased to 10-15 mCrab (S/N > 21) during observations on April 15-April 24. At the same time the source was also detected in 40-100 keV energy band at the flux of ~10 mCrab (S/N > 14). We also report a first detection of hard X-ray emission from a known high mass binary pulsar AX1820.5-1434 on April 19-24 at ~10-15 mCrab in the 15-40 energy band. Previous observations of the same field have not shown the presence of the source in this energy band with an upper limit ~5 mCrab. We encourage follow up observations at various wavelengths.
2003-04-30 17:19:00
x-ray,gamma ray,binary,pulsar,transient,request for observations
2003-04-30
17:19:00
975
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154
156
IGR J17597-2201 = XTE J1759-220
C. B. Markwardt (U. Maryland & NASA/GSFC) and J. H. Swank (NASA/GSFC)
We report that the transient detected by Lutovinov et al. (ATEL #155), IGR 17597-220, is at a position consistent with a transient which has been active since at least 07 Feb 2001, when it was first detected in RXTE PCA galactic bulge scans. Dedicated PCA scans on 19 May 2001 determined a best fit PCA position to be R.A. = 18h00.0m, Decl. = -22o03m (equinox 2000.0; estimated uncertainty 4'). The XTE designation of XTE J1759-220 was generated based on a preliminary position from the PCA bulge scans. The X-ray flux has varied erratically between 2 and 17 mCrab (2-10 keV) since detection, with alternating calm and flaring periods. For the past year, the flux has been more stable (3-6 mCrab). Over the time period of the reported INTEGRAL detection (16-26 Apr 2003), the 2-10 keV flux in the PCA scans has been 4.5-7.2 mCrab, with no obvious trend. Before Feb 2001, the X-ray flux was less than approximately 1 mCrab. In RXTE PCA pointed observations on 01 and 03 June 2001; and 09 and 11 Oct 2001, there was evidence of dipping behavior (~30% dips; ~5 min duration). A period of 1-3 hours is suggested, but highly unconstrained because of the time sampling. No QPOs or pulsations were detected. The PCA X-ray spectrum was consistent with power law plus soft emission, with photon indices ranging between 1.8 and 2.9. An emission line associated with Fe K, (centroid 6.5-6.7 keV) is present with equivalent widths in the 130-250 eV range. On 22.843 Apr 2003, during a PCA bulge scan this year, an apparent X-ray burst was detected from a position consistent with the source. Unfortunately, the scan contained only the tail of the burst, and so a reliable peak flux is not yet available. The combination of these observations suggests that IGR J17597-2201 (= XTE J1759-220) is a neutron star in a short-period binary.
2003-05-01 22:09:00
x-ray,binary,neutron star,star,transient,a comment
2003-05-01
22:09:00
1,827
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155
157
IGR J18483-0311
M. Chernyakova (ISDC, Geneva), A. Lutovinov (IKI, Moscow), F. Capitanio (CNR, Rome), N. Lund (DSRI, Copenhagen), N. Gehrels (GSFC/NASA)
We report the discovery of a new transient source, IGR J18483-0311, with the IBIS/ISGRI detector onboard the INTEGRAL observatory. The source position is RA=18h48.3m and DEC=-03o11m (equinox 2000), with uncertainty ~2' (including statistical and systematical errors). This position is 0.7 arcminute from the position of the ROSAT source 1RXH J184817.3-031017 and more than 11 arc minutes from the known X-ray sources EXO846-031, GRO J1849-03 and GS1845-03. The source was detected during observations of the Galactic Centre field performed between April 23.00 and April 28.65, with fluxes ~10 mCrab in the 15-40 keV band (signal to noise ratio S/N ~21) and ~5 mCrab in the 40-100 keV band (S/N ~11). A possible outburst was observed between UT 04:57 - 05:27 on April 26. During this period the source flux increased up to ~40 mCrab in the 15-40 keV energy band (S/N ~7.3). The X-ray monitor JEMX onboard the INTEGRAL gives for this source a conservative upper limit of 20 mCrab in the 4-18 keV energy range. We encourage follow up observations at various wavelengths.
2003-05-03 00:41:00
x-ray,gamma ray,transient,request for observations
2003-05-03
00:41:00
1,070
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156
158
Optical observations of the IGR J18539+0727 field
N. Masetti (IASF/CNR, Bologna) and L. Foschini (IASF/CNR, Bologna & ISDC, Geneve)
We report optical observations of the field of the transient IGR J18539+0727 (Lutovinov et al., ATel #151) acquired with the BFOSC instrument mounted on the Bologna Astronomical Observatory 1.5-m "G.D. Cassini" telescope located in Loiano (Italy). A single 20-minute R-band image was acquired starting at 01:43 UT of 2003 April 28 under a seeing of about 1.8 arcsec. The 3-sigma limiting magnitude of the image is R ~ 22.0. Comparison with the red DSS-II survey indicates that no new object is present in the IGR J18539+0727 error box down to the survey limit (R ~ 21.5).
2003-05-09 23:09:00
optical,x-ray,gamma ray,binary,black hole,neutron star,star,transient
2003-05-09
23:09:00
573
[ -0.07121282070875168, -0.05195540189743042, -0.014575677923858166, 0.011860756203532219, 0.06758244335651398, -0.08575887233018875, -0.023095006123185158, 0.08847669512033463, 0.006968276109546423, -0.02464248053729534, -0.05581171065568924, -0.05241531878709793, -0.0572347491979599, -0.014240525662899017, -0.028825532644987106, -0.04962541535496712, 0.062157243490219116, -0.029127104207873344, 0.017903907224535942, 0.004846595227718353, -0.053491514176130295, 0.010257082991302013, -0.050659410655498505, 0.021691888570785522, 0.06852167099714279, 0.019223427399992943, -0.02095666341483593, -0.0479859858751297, -0.045466694980859756, -0.05497714877128601, 0.006019826978445053, 0.05117039754986763, -0.0008270134567283094, -0.0007529338472522795, 0.020174328237771988, 0.006039717700332403, 0.0968681275844574, -0.09347540140151978, 0.04786745458841324, -0.0315607525408268, -0.03265701234340668, -0.048819418996572495, 0.06019439920783043, -0.009827778674662113, 0.01826283521950245, 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157
159
An X-ray outburst of GS1843+009 detected with INTEGRAL
A. M.Cherepashchuk (SAI, Moscow), S. Molkov (IKI, Moscow), L. Foschini (IASF/CNR, Section of Bologna & ISDC, Geneve), M. Orlandini (IASF/CNR, Section of Bologna), S. Grebenev (IKI, Moscow), E. Palazzi (IASF/CNR, Section of Bologna)
We report the detection of a hard X-ray outburst of the transient X-ray pulsar GS1843+009 with the IBIS/ISGRI telescope aboard INTEGRAL. The source was detected during the May 1-11 observing run at a S/N ratio of ~20 in the 18-100 keV energy range. The preliminary measured fluxes were about 15, 10 and 10 mCrab in the 18-25, 25-50 and 50-100 keV bands, respectively. The source was below the detection limit during the INTEGRAL observations of the field performed on March 10, 22, 30 and April 5, 12, 2003 (the 3-sigma upper limits were 7, 4 and 5 mCrab in the same energy bands, respectively). This source outburst was much weaker than the two known previous ones (1988, 1997). In particular the fluxes measured with INTEGRAL are an order of magnitude lower than those measured with BeppoSAX during the 1997 outburst (cf. Piraino et al. 2000, A&A, 357, 501).
2003-05-14 23:35:00
x-ray,pulsar,transient
2003-05-14
23:35:00
860
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158
160
BeppoSAX measurements of IGR J17091-3624 = 1SAX J1709-36
J. J.M. in 't Zand, J. Heise, and P. Lowes (Space Research Organization Netherlands, Utrecht), P. Ubertini (CNR Istituto di Astrofisica Spaziale e Fisica Cosmica, Rome)
On Sept. 20.7 through 21.7 and Sept. 29.8 through Oct. 1.1, 2001 (UT), the Wide Field Cameras on BeppoSAX detected a source which coincides with the recently reported new X-ray source IGR J17091-3624 (Kuulkers et al., ATel #149). From combined data taken during August-October 2001, the source was localized to R.A. = 17h 09m 06s, Decl. = -36d 24' 39", with an error radius of 1.5' (99% confidence level). The position is 0.03' from the INTEGRAL centroid, 0.5' from the COMIS-TTM centroid (Revnivtsev et al., ATel #150), and 1.3' from the reported radio source (Rupen et al., ATel 152). The flux was 14 mCrab and 20 mCrab (2-10 keV) during the two observations. The spectrum is consistent with a 3.0+/-0.4 photon-index power law or kT=4.3+/-1.4 keV for thermal bremsstrahlung; NH was constrained to upper limits of 5E22 and 2E22 cm-2, respectively (90% confidence). A search through the WFC archive revealed a weak detection five years earlier, in the combined data of the 1996 August-Oct WFC campaign of the Galactic center. In 650 ksec of data, the source was detected at an average flux of about 5 mCrab. All X-ray data combined imply that IGR J17091-3624 = 1SAX J1709-36 is a moderately bright variable X-ray source which flared in Oct. 1994 (Mir-COMIS/TTM), Sept. 1996 (BeppoSAX-WFC), Sep. 2001 (BeppoSAX-WFC), and April 2003 (INTEGRAL-IBIS) and most likely is an X-ray binary. We note that the source was followed up by the BeppoSAX Narrow-Field Instruments on Sept. 25, 2001, after the first real-time detection. Therefore, it is listed in the SAX observation catalog under 1SAX J1709-36. Unfortunately, this observation was terminated before useful data could be taken due to problems with the satellite attitude control.
2003-05-20 22:37:00
radio,x-ray,gamma ray,binary,black hole,neutron star,star,transient,variables
2003-05-20
22:37:00
1,729
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159
161
4U 1630-47 Enters a Bright X-Ray Flaring State
John A. Tomsick (UC San Diego)
The black hole candidate X-ray transient 4U 1630-47 is currently undergoing an extended outburst that began in 2002 September (see ATELs #106, #108, and #109) and has now persisted for nearly 260 days. Over the past 10 days (MJD 52,776-52,786), the source brightened from 20 c/s to over 40 c/s in the Rossi X-ray Timing Explorer ASM, and the 1.5-12 keV flux is currently near 2E-8 erg cm^-2 s^-1. As the flux increased, our RXTE/PCA observations indicate that the X-ray (3-60 keV) variability on ~10-100 second time scales increased significantly. On 2003 May 18 and May 21, the source exhibited multiple 50-100 second X-ray flares, during which the flux increased by a factor of 1.5-2.0. These flares appear to be similar to the flares seen near the start of the outburst (see ATEL #109 by Homan & Wijnands). A detailed analysis of the May 21 (MJD 52,780.7) PCA observation indicates that the other X-ray spectral and timing properties are similar to the properties at the start of the outburst. The energy spectrum is well-described by a disk-blackbody with a inner disk temperature of 1.6 keV plus a power-law with a photon index of 2.4. The power spectrum has a power-law shape with a fractional rms of 12% (0.01-100 Hz), and no QPOs are present.
2003-05-28 00:59:00
x-ray,black hole,transient
2003-05-28
00:59:00
1,250
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160
162
High Frequency Quasi-Periodic Oscillations in the X-ray Flux of the Black Hole Candidate H 1743-322 = IGR/XTE J1746(4)-3213
J. Homan (OAB, Merate), J. M. Miller (CfA), R. Wijnands (St. Andrew's), D. Steeghs (CfA), T. Belloni (OAB, Merate), M. van der Klis (Amsterdam), and W. H. G. Lewin (MIT)
We report on a ~25 ks RXTE observation of the soft X-ray transient and black hole candidate H 1743-322 (= IGR/XTE J1746(4)-3213, see ATELs 146, 142, 141, 140, 139, 138, 137, 136, 133, 132) performed on May 28 2003 (05:02 UTC - 16:53 UTC). The source was observed at a 3-100 keV flux of ~2.5x10e-8 ergs/cm^2/s with a spectrum that could be fitted well with a disk black body (kT~1.2 keV) and a power law (index~2.6) extending to above 200 keV with no apparent cutoff. Assuming a distance of 8.5~kpc, this translates to a luminosity of 2.2x10e+38 erg/s (3-100 keV). About two and a half hours after the start of the observation the source showed a sudden spectral hardening that occurred within 100 s and which was the result of the power law flux contribution increasing from 48% to 58%. After this transition a high frequency QPO was detected (~4.5 sigma) at a frequency of 240 Hz, with a width of 30 Hz and a strength of 2% rms (6-21 keV), making this source the 7th black hole candidate to show such fast variations. An additional QPO may be present (~2.5 sigma significance) around 160 Hz, suggestive of a 2:3 frequency ratio. At lower frequencies two sharp QPOs were present at 4.8 and 9.3 Hz before the transition, of which the first seemed to evolve into a less coherent and stronger asymmetric QPO around 6.6 Hz after the transition. The total power between 0.01 and 100 Hz remained more or less constant at a level of ~10% rms (6-21 keV). No QPOs were found in a ~17 ks RXTE observation performed on May 1 2003 when the source had a flux of ~2x10e-8 erg/cm^2/s but a considerably softer spectrum. Recent RXTE/ASM observations suggest that moderate spectral transitions like the one reported above are lately occurring more frequently. We encourage multi-wavelength observations of the source to study the optical/IR and radio response to such X-ray transitions, which are probably related to changes in the inner regions of the accretion flow.
2003-06-01 01:13:00
radio,far-infra-red,infra-red,optical,x-ray,binary,black hole,transient
2003-06-01
01:13:00
1,951
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161
163
New Transient X-ray Pulsars in the SMC (XTE J0103-728, XTE SMC144s)
R. H.D. Corbet (GSFC and USRA) C. B. Markwardt (GSFC & University of Maryland) F. E. Marshall (GSFC), M. J. Coe and W. R.T. Edge (Southampton University) and S. Laycock (CfA)
We have detected two new transient X-ray pulsars in the direction of the Small Magellanic Cloud with the RXTE Proportional Counter Array. The sources were detected within the 2 degree FWZI field of view of the PCA while pointed at R.A. = 00h53m53s, Decl. = -72o26m42s (equinox 2000.0). A source with a period of 6.8482 +/- 0.0007 s was seen in observations made on 2003 Apr. 29, May 7, May 15 and May 19 but not detected in observations made on Apr. 24 and May 28. Other pulsars were also detected during these observations. Pulsations with periods near 152s from CXOU J005750.3-720756 (Macomb et al. 2003, ApJ, 584, L79) were seen on Apr 29 and May 7. Pulsations wither periods near 59s from XTE J0055-724 (Marshall et al. 1998, IAUC # 6818 ) were seen on May 15 and May 19. Pulsations from another previously unknown source with a period of 144.1 +/- 0.3 s were also seen on May 19. Slews were made across this field in both R.A. and declination for all observations. From the observations made on April 19, May 7, May 15, and May 19 we find for the 6.8s pulsar count rates of 7.6 +/- 0.4 (3.8 mCrab), 6.9 +/- 0.4 (3.5 mCrab), 4.5 +/- 0.3 (2.3 mCrab) and 5.8 +/- 0.4 (2.9 mCrab) counts/s/Proportional Counter Unit (2 - 30 keV) respectively. From a combined fit to all slews a position of R.A. = 15.36, Decl. = -72.72 (equinox 2000.0) was obtained. The error box is ellipsoidal with maximum extent 2 sigma statistical errors of approximately +/- 0.14 degrees 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 active sources. The statistical error box is available at http://lheawww.gsfc.nasa.gov/users/corbet/pulsars/xtej0103_ebox.ps. We designate this source XTE J0103-728. The coordinates of the 144.1s source could not be constrained due to the number of sources active in the single observation during which this source was detected. We hence use the "timing" name of XTE SMC144s for this source. A list of known X-ray pulsars in the SMC is provided at: http://lheawww.gsfc.nasa.gov/users/corbet/pulsars
2003-06-05 05:47:00
x-ray,binary,neutron star,pulsar,star,transient
2003-06-05
05:47:00
2,134
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162
164
Revised Orbit and Burst Oscillations from the Millisecond Pulsar XTE J1814-338
C. B. Markwardt (U. Maryland & GSFC), T. E. Strohmayer and J. H. Swank (GSFC)
C. B. Markwardt, University of Maryland and Goddard Space Flight Center (GSFC), T. E. Strohmayer and J. H. Swank (GSFC) report on further observations of the newly discovered accreting millisecond pulsar XTE J1814-338. In IAUC 8144 , we reported that the position of the source, as derived from RXTE PCA scans on Jun 5.1 (UT) was R.A. = 18h13m40s, Dec. = -33o46' (equinox 2000.0) with a 99% confidence radius of 2'. The Jun 5.1 observation also contained pointed data which revealed coherent pulsations with a period of 3.2 ms, making this the fifth known millisecond pulsar, and the fourth to be discovered in the past fourteen months. In IAUC 8144 , we reported a preliminary orbital period of ~2 hr, based on a short orbservation of 3400 s. By combining observations from Jun 5-10, we have determined a phase-connected timing solution including binary Doppler motion, and find a rest-frame pulsar frequency of 314.35610(2) Hz with a best fit orbital period is 4.27462(9) hr. This determination is now based on a much increased time baseline which fully samples the orbital phases. The projected pulsar semimajor axis, a_x sin(i), is 390.3(3) lt-ms, which yields a mass function of 0.002016(4) solar masses. This system has a significantly longer period, larger orbit and larger companion (minimum companion mass of 0.16 solar masses), compared to the four previously known accreting millisecond pulsar systems. The companion is likely to be a hydrogen dwarf. At least three thermonuclear X-ray bursts have been seen from XTE J1814-338. All of them have exhibited nearly coherent oscillations during the burst, at a frequency close to the persistent pulsation frequency. There is no apparent evolution in burst oscillation frequency during the burst. This is very similar behavior to the burst oscillations originally discovered from the first accreting millisecond pulsar, SAX J1808.4-3658 (Chakrabarty et al. 2003, Nature, in press). The X-ray flux has been slowly and steadily rising from about 9 mCrab on Jun 5, to 12 mCrab on Jun 10. The source is either very underluminous (~1% of Eddington at the galactic center), or very distant. However, if XTE J1814-338 is very distant, the high galactic latitude (12 deg) would place it several kiloparsecs off the galactic plane. The energy spectrum is somewhat harder than the previously known millisecond pulsar systems, consistent with a power law with photon index ~1.5, and a high energy cut-off above 20 keV.
2003-06-11 22:36:00
x-ray,binary,neutron star,pulsar,star,transient,a comment
2003-06-11
22:36:00
2,466
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163
165
The aperiodic timing behaviour of XTE J1814-338
Rudy Wijnands (University of St Andrews) and Jeroen Homan (OAB, Merate)
We report on the aperiodic timing behaviour of the accretion-driven millisecond X-ray pulsar XTE J1814-338 (IAUC 8144 ) as observed with the Rossi X-ray Timing Explorer between 8 and 11 June 2003. These observations were already used by Markwardt et al. (ATEL #164) to report on the improved orbital period of the system and on the discovery of burst oscillations. We combined all observations (~50 ksec of data after removal of the type-I X-ray bursts) to increase the sensitivity. The overall shape of the 3-60 keV power spectrum is dominated by a strong broad band-limited noise component (23.7+/-0.3 % r.m.s. amplitude for the frequency range 0.01-100 Hz). A broken power law fit to this component yielded a break frequency of 0.27+/-0.01 Hz and indices of -0.06+/-0.03 and 0.88+/-0.01, respectively, below and above the break. On top of this noise component, a bump is present which could be fitted with a Lorentzian with a frequency of 1.8+/-0.1 Hz, a width of 1.6+/-0.3 Hz, and a strength of 6.9+/-0.7 % r.m.s. These characteristics make the power spectrum of XTE J1814-338 very similar to that observed in the non-pulsing low-luminosity neutron-star low-mass X-ray binaries, the atoll sources, when they are observed at relatively low X-ray luminosities (i.e., in the so-called island state). This is consistent with the hard power-law X-ray spectrum of the source reported in ATEL #164. This resemblance of XTE J1814-338 to the atoll sources is further strengthened by the fact that the source falls on the relation between the break frequency and the frequency of the bump found by Wijnands & van der Klis (1999, ApJ 514, 939). We searched for QPOs above 100 Hz (the kHz QPOs), but none were found (see plot). However, the amplitude upper limits (3-60 keV) on the presence of such QPOs are not very stringent; depending on the width, which was chosen to be between 50 and 100 Hz, we obtained upper limits of 6-7 % r.m.s. (for frequencies above 600 Hz) and 9-11 % (below 600 Hz). Those upper limits are comparable to the amplitudes of the recently discovered kHz QPOs in the accretion-driven millisecond X-ray pulsar SAX J1808.4-3658 (Wijnands et al. 2003, Nature, in press), so the presence of similar kHz QPOs in XTE J1814-338 cannot be excluded.
2003-06-12 04:06:00
x-ray,binary,neutron star,pulsar,star,transient
2003-06-12
04:06:00
2,259
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164
166
XTE J1814-338 is likely the EXOSAT slew source EXMS B1810-337
Rudy Wijnands (University of St Andrews) & Alastair Reynolds (ESTEC)
We report that the new X-ray transient and accretion-driven millisecond X-ray pulsar XTE J1814-338 (IAUC 8144 , ATEL #164 and #165) is at a position consistent with the source EXMS B1810-337 listed in the EXOSAT medium-energy slew survey catalogue (Reynolds et al. 1999, A&AS 134, 287, Table 5). The error box of EXMS B1810-337 fully encompasses the error circle quoted for XTE J1814-338 in IAUC 8144 and ATEL #164, indicating that EXMS B1810-337 is most likely the same source as XTE J1814-338. The coordinates for the corners of the EXOSAT error box of EXMS B1810-337 are given by: 273.679, -34.456; 273.507, -32.963; 273.242, -32.983; 273.410, -34.477 (decimal R.A. and Dec. for epoch J2000; we note that the corner coordinates given in Table 5 of Reynolds et al. 1999 are for B1950 and not for J2000 as stated in the same paper). The figure shows the ROSAT All Sky Survey image (in J2000 coordinates) of the region around XTE J1814-338 with the RXTE error circle and the EXOSAT error box over-plotted (note that XTE J1814-338 is not detected in the ROSAT data). EXMS B1810-337 was detected on 2 September 1984 with an absorbed 2-10 keV flux of ~5E-11 erg/s/cm/cm. If XTE J1814-338 can indeed be identified with EXMS B1810-337, then the recurrence time of this source can be inferred to be less than 19 years but more than 4.5 years (the time since the RXTE/PCA bulge scan observations started in February 1999; Swank & Markwardt 2001, astro-ph/0109240), unless the recurrence time of the source varies significantly.
2003-06-19 00:41:00
x-ray,binary,neutron star,pulsar,star,transient,a comment
2003-06-19
00:41:00
1,520
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165
167
XTE J1811-197: Position and Fluxes of A New 5.54 s pulsar
C. B. Markwardt (U. Md. & GSFC), A. I. Ibrahim (GWU), J. H. Swank (GSFC)
In Ibrahim et al. (GCN #2306), we reported the presence of a 5.54 s pulsar, detected in the RXTE PCA field of an observation of SGR 1806-20. At the time, we speculated that the pulsar could either be the source of soft gamma repeater bursts seen by the IPN (GCN #2297); or, a previously unknown pulsar simultaneously active with the known SGR 1806-20. Since then, Hurley et al. (GCN #2308) have concluded that HETE data agree with the IPN that SGR 1806-20 is the likely source of the bursts. An RXTE PCA scanning observation was performed on Jul 18.23-18.27 (UT). A new source was detected, whose position is, R.A. = 18h10.9m, Decl. = -19o42' (equinox 2000.0), with estimated 99% confidence semi-major axes of 5' in R.A. and 7' in Decl. This confidence region is not consistent with either the IPN burst annuli (GCN #2297) or the HETE burst error region (GCN #2308), or with any other known pulsar of that period. Thus, we designate this new source as XTE J1811-197. The best fit position is 21' from the galactic plane. See the following web page for more details. The fitted flux of XTE J1811-197 was 2.5 +/- 0.2 mCrab (2-10 keV), which is comparable to flux of SGR 1806-20 (1.1 +/- 0.1 mCrab) and the galactic diffuse emission (2.9 mCrab), which are also in the field of view. Assuming a distance of 8.5 kpc, the luminosity is approximately 10^{36} erg/s. In retrospect, the source has been present in the RXTE PCA galactic bulge monitoring program at the very edge of the scan region since Feb 7, and has declined steadily from an initial flux of 3.6 mCrab (2-10 keV). The spectra of the sources were deconvolved by selecting light curves of different energy bands and fitting the source intensities while holding the positions constant. The resulting spectrum of XTE J1811-197 is consistent with a power law of photon index ~4. Such a soft spectrum is not typical of high mass X-ray binaries, and based on the pulse period, one might speculate that it is an anomalous X-ray pulsar. On the other hand, the long term light curve is more typical of a transient pulsar in an X-ray binary.
2003-07-23 22:49:00
x-ray,gamma ray,binary,neutron star,pulsar,soft gamma-ray repeater,star,transient,request for observations
2003-07-23
22:49:00
2,093
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166
168
Corrected Name for 5.54 s Pulsar: XTE J1810-197
J. H. Swank (GSFC), C. B. Markwardt (U..Md. & GSFC), A. I. Ibrahim (GWU)
In ATEL 167, we reported the position of a new source as R.A. = 18h10.9m, Decl. = -19o42' (equinox 2000.0) , with estimated 99% confidence semi-major axes of 5' in R.A. and 7' in Decl. We designated the new pulsar as XTE J1811-197. The same name appeared in CBET 36. It was brought to our attention by Dr. Marion Schmitz, head of the IAU Working Group on Designations, that the name did not follow the specifications of the IAU, which can be found at: http://cdsweb.u-strasbg.fr/iau-spec.html. As the R.A. should be truncated, rather than rounded up, the official IAUC 8168 now announces the source as XTE J1810-917. Please make the change in your data bases and take care not be confused by the temporary appearance of both names.
2003-07-28 23:32:00
x-ray,neutron star,pulsar,star,transient
2003-07-28
23:32:00
731
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-0.05970395728945732, -0.017170721665024757, 0.038275331258773804, 0.028234148398041725, 0.04792487621307373, -0.02728581428527832, -0.04244357720017433, -0.028255103155970573, -0.08341096341609955, -0.019447170197963715, 0.030881522223353386, 0.04014058783650398, -0.047778766602277756, 0.04206116124987602, 0.020140649750828743, -0.08359678834676743, -0.06800878047943115, -0.008943179622292519, -0.022154057398438454, 0.09326760470867157, -0.08132132142782211, -0.05010414123535156, -0.00921346340328455 ]
167
169
A state transition in the black-hole candidate SLX 1746-331
Jeroen Homan (INAF/OAB, Merate) and Rudy Wijnands (University of St Andrews)
Since the detection in April 2003 of a new outburst of the black hole candidate SLX 1746-331 (ATEL #143, #144, and #145), the RXTE/PCA has been monitoring the source every 3-4 days. Currently, a total of 65 ksec of data has been obtained. The source has decreased slowly in flux (3-25 keV; unabsorbed) from 5.4E-9 ergs/s/cm^2 on April 28 to 2.0E-10 ergs/s/cm^2 on July 22. The latest observation, taken on July 26, shows an increase in the flux to 3.6E-10 ergs/s/cm^2. A figure showing the evolution of the count rate (3-25 keV) and spectral hardness (defined as the ratio of counts in the 6.1-9.8 keV and 3.3-6.1 keV bands) can be found at: http://www.merate.mi.astro.it/~homan/SLX1746-311/lc-hc.ps A major spectral transition occurred between the observations on July 19 and July 21. Before the transition, the energy spectra were dominated by a soft component which could be fitted with a multi-color disk model with temperatures of 1.0-1.3 keV (contributing ~80-90% of the 3-25 keV flux), similar to the spectrum reported at the start of the outburst by Markwardt (2003, ATEL #143). No broad-band noise could be detected in the power density spectra with typical upper limits of 2-3 % r.m.s. (for the energy range 3.6-60 keV and the frequency range 0.01-100 Hz). After the transition, the energy spectra were considerably harder and dominated by a power law component with index ~1.7 (contributing ~80% of the 3-25 keV flux); band-limited noise was detected in the power-density spectra with a strength of ~10 % r.m.s.. The spectral hardening and the increase in the strength of the variability strongly suggest that the source made, or is making, a transition from the black-hole soft state to the hard state. As transitions from the soft to the hard state are commonly associated with the onset of an outflow (e.g. Fender, R., 2003, astro-ph/0303339) the source may have become detectable as a radio source. More RXTE observations are scheduled to follow the X-ray behavior of the source.
2003-07-30 18:12:00
radio,x-ray,black hole,transient
2003-07-30
18:12:00
1,996
[ -0.07933022081851959, -0.05163588002324104, 0.015919482335448265, 0.1094498336315155, 0.046035803854465485, -0.05187241733074188, -0.024383408948779106, 0.056468259543180466, 0.04171115532517433, -0.0677090436220169, -0.02956378646194935, -0.05373410880565643, -0.04826987907290459, -0.04854351282119751, -0.0076968614012002945, -0.047996826469898224, 0.06321493536233902, -0.03287385776638985, -0.03622645139694214, 0.0022890751715749502, -0.027780279517173767, 0.03341085463762283, 0.0036648919340223074, 0.04638364166021347, 0.045128658413887024, -0.019542448222637177, -0.00506617920473218, -0.05033307150006294, -0.006676072254776955, -0.05099629983305931, 0.00461543956771493, 0.025381097570061684, -0.007712853141129017, 0.007813354954123497, 0.06450645625591278, -0.006359485909342766, 0.009967486374080181, -0.014112752862274647, -0.03801598772406578, 0.019544126465916634, -0.0017239425797015429, -0.04709470644593239, -0.004930851049721241, 0.03354975953698158, -0.025618085637688637, 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168
170
Optical Outburst of V4641 (=SAX J1819.3-2525)
M. Buxton (Yale), D. Maitra (Yale), C. Bailyn (Yale), L. Jeanty (Yale), D. Gonzalez (CTIO)
SMARTS consortium observations of the black hole candidate V4641 Sgr with the 1.3m telescope at CTIO + ANDICAM instrument from UT 2003 Aug 4.00 indicate that the source is starting a new outburst. The B, V, and I magnitudes were 12.8, 12.6 and 12.2, which is 1.1, 1.1 and 1.1 magnitudes above the predicted quiescent value. I-band data folded on the orbital period show activity as early as UT 2003 Aug 1.95. Observations at all wavelengths are encouraged. Our recent optical data from SMARTS are posted at http://phoenix.astro.yale.edu/buxton/smarts/v4641_2003outburst.html
2003-08-05 06:31:00
optical,binary,black hole,transient
2003-08-05
06:31:00
574
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169
171
X-ray and Optical Activity in V4641 Sgr (=SAX 1819.3-2525)
C. Bailyn, D. Maitra, M. Buxton, L. Jeanty (Yale), D. Gonzalez (CTIO)
V4641 Sgr is now active in X-rays, and activity continues in optical/IR bands. A ~1 kilosecond dwell with the RXTE/PCA taken August 5 2003 starting at UT 01:18 shows flux varying from 20 to 35 mCrabs. On August 6 between UT 08:43 - 09:31 the source was in a highly active flaring state, with flares of up to 100 mCrabs erupting on timescale of 10-30 seconds. Observations on August 6 from UT 10:23 - 11:13 did not show large flares, but rather a state similar to that observed in the August 5 dwell. Similar activity was also seen in optical/IR observations by the SMARTS consortium, using the 1.3m telescope at CTIO with the ANDICAM instrument. On August 6 the source brightened in the V band from magnitude 12.4 to 10.9 between UT 00:00 and UT 05:15. The source became somewhat bluer during this rise: over the same period the K band brightened by only 1.1 magnitudes. Flares and dips of several tenths of a magnitude were observed on timescales of <3 minutes.
2003-08-07 06:55:00
infra-red,optical,x-ray,black hole,transient
2003-08-07
06:55:00
962
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-0.03912725672125816, -0.007337348069995642, 0.0523257702589035, 0.04625694081187248, -5.35617594721316e-8, 0.0016800061566755176, 0.008002275601029396, -0.061134882271289825, 0.038691576570272446, 0.08436120301485062, -0.02526993677020073, 0.025999251753091812, 0.047184646129608154, 0.018845057114958763, 0.003914381843060255, 0.035648684948682785, -0.01798608899116516, 0.0677238181233406, -0.07312998920679092, 0.09136155247688293, -0.031900666654109955, -0.011951398104429245, -0.0431639701128006, -0.06682069599628448, 0.006154973059892654, 0.045105502009391785, 0.03470456600189209, 0.05850951373577118, -0.04761647805571556, 0.007080044597387314, 0.09494148194789886, 0.025132320821285248, 0.08376264572143555, 0.0008927991148084402, -0.11096784472465515, -0.0136251924559474, 0.0016134778270497918, 0.014791392721235752, -0.06449583172798157, -0.08520256727933884, 0.06888985633850098, -0.033708300441503525, 0.062281105667352676, 0.04314950853586197, 0.053962111473083496, -0.1136074885725975, -0.05695260688662529, -0.013417127542197704, 0.08567245304584503, -0.10027347505092621, 0.02783121168613434, -0.047687869518995285, -0.08987513929605484, -0.007012862712144852, -0.08378820866346359, 0.003984345123171806, -0.05946997553110123, -0.003407759591937065, -0.022086553275585175, -0.041936926543712616, -0.0402626097202301, 0.0075989519245922565, 0.025044124573469162, 0.00325025524944067, -0.026672331616282463, 0.008916704915463924, -0.06871842592954636, -0.1182897686958313, 0.012575337663292885 ]
170
172
Strong radio flare in V4641 Sgr (= SAX J1819.3-2525)
M. P. Rupen, A. J. Mioduszewski, & V. Dhawan (NRAO)
We report a strong radio flare from the X-ray transient and likely black hole binary V4641 Sgr, which has recently become active again in the optical (ATEL #170) and X-ray (ATEL #171) bands. Observations with the Very Large Array (VLA) on August 6, 2003 gave strong detections at both 4.86 and 8.46 GHz, compared with a non-detection at 4.86 GHz on July 31, 2003 with an rms noise level of 0.1 mJy/beam. The August 6 data show a roughly linear decline at 4.86 GHz over 14 minutes, from 664+/-2 mJy at MJD 52857.142, to 621+/-2 mJy at MJD 52857.151; and a similarly linear decay over 4 minutes at 8.46 GHz, from 569+/-2 mJy at MJD 52857.152, to 545+/-2 mJy at MJD 52857.155. Extrapolating linear fits to both decays, this gives a spectral index alpha (S_nu going as nu^alpha) of about -0.14 at MJD 52857.1515, suggesting optically-thick synchrotron radiation. These VLA A configuration images give an improved radio position for the source (J2000) of
2003-08-07 22:04:00
radio,infra-red,optical,x-ray,binary,black hole,transient
2003-08-07
22:04:00
950
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-0.02345544844865799, 0.011413659900426865, -0.03945275396108627, -0.09086644649505615, 0.008236791007220745, -0.02423878200352192, -0.10332074761390686, -0.027103839442133904, -0.06751476228237152, 0.056719567626714706, -0.05758395418524742, -0.03336850181221962, -0.13099144399166107, -0.07011649012565613, -0.03456657752394676, -0.009887361899018288, -0.05180790275335312, -0.013251184485852718, 0.00809506792575121, 0.0252621378749609, -0.11464432626962662, -0.08097055554389954, -0.01201190147548914 ]
171
173
The optical counterpart to the transient X-ray pulsar SAX J2103.5+4545
Pablo Reig (University of Valencia) and Fotis Mavromatakis (University of Crete)
We report observations of the likely optical counterpart to the 358.61-s X-ray pulsar SAX J2103.5+4545 (Hulleman et al. 1998, A&A, 337,L25). Optical photometric observations of the field around the best-fit BeppoSAX position (R.A:=21:03:33, DEC = +45:45.0) carried out on 2003 June 8.96 with the 1.3-m telescope of the Skinakas Observatory (Crete, Greece) revealed several Halpha emitters but only one inside the ~2arc-min BeppoSAX radius error circle. The coordinates of the proposed optical counterpart are RA=21:03:35.7 DEC=+45:45:04 (Eq. 2000), that is, ~30 arc-sec Eastward of the X-ray position. Measured photometric magnitudes are B=15.3, V=14.2, R=13.7. An intermediate resolution spectrum of this star taken on 2003 August 1.92 with the 1.3-m telescope of the Skinakas Observatory shows a red-dominated double-peaked H-alpha emission line with an equivalent width of EW=-2.5A and the presence of Helium. These spectral characteristics together with the modulation of the X-ray flux with the orbital period of 12.68 days (Baykal et al. 2000, ApJ, 544, L129) suggest that the system is a Be/X-ray binary. Further optical observations are underway to determine the spectral type and confirm if the object is a Be star.
2003-08-08 01:00:00
optical,x-ray,binary,pulsar,star,transient
2003-08-08
01:00:00
1,227
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172
174
Rapid optical variability of V4641 Sgr (=SAX J1819.3-2525)
I. Khamitov, Z. Aslan (TUG), K. Yakut (EgeU), I. Bikmaev, R. Gumerov, N. Sakhibullin (KSU), R. Sunyaev, M. Revnivtsev (IKI, MPA), M. Pavlinsky (IKI)
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 Bakyrlytepe during the period 19:01-22:16 UT, Aug. 6, 2003. The Rc magnitude of the source averaged over all observations was m_Rc~11.7. Time resolution of the photometric data is 9.7 sec. The observed light curve demonstrates strong aperiodic variability at all time scales, from tens of seconds to hours. Several spikes weer observed with duration of the order of a minute and amplitudes up to 1 magnitude. Power spectrum of the optical flux variations could be described by a power law with the slope -1.8 in the frequency band 1e-4 - 0.04 Hz.
2003-08-08 04:11:00
optical,x-ray,binary,black hole,transient,request for observations
2003-08-08
04:11:00
675
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173
175
Further radio observations of V4641 Sgr (= SAX J1819.3-2525)
M. P. Rupen, V. Dhawan, & A. J. Mioduszewski
We report further radio observations of the X-ray transient and likely black hole binary V4641 Sgr (ATEL #170, #171, #172, #173, #174). Observations with the Very Large Array (VLA) August 8 and 9, 2003 gave flux densities of 4.08+/-0.08 and 3.07+/-0.11 mJy, respectively, at 4.86 GHz; and 2.84+/-0.05 and 2.16+/-0.09 mJy at 8.46 GHz. The corresponding spectral index on both days is about -0.6, indicating optically-thin synchrotron emission. This represents a very marked decline from the 545-665 mJy seen on August 6 (ATEL #172). Comparing the data from August 8 and 9 however suggests a much slower decay at both frequencies, which can be fit, for example, by an exponential with a time constant of 3.6 days. This could be a long-lived remnant as seen following the major flare in 1999 (cf. Hjellming et al. 2000, ApJ 544, 977-992), or the beginning of a series of rapid and chaotic events as in 2002 (e.g., IAUCs 7906 , 7908 , and 7928 ; ATEL #105). Further VLA and VLBA observations are planned, and we urgently request complementary observations at other wavelengths. Simultaneous observations at radio, X-ray, and optical/infrared wavelengths are particularly valuable. To this end we have created a Web site summarizing the planned observations of which we are aware, particularly at X-ray and radio wavelengths:
2003-08-09 14:23:00
radio,optical,x-ray,binary,black hole,transient,variables,request for observations
2003-08-09
14:23:00
1,322
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174
176
IGR J16479-4514
S. Molkov (IKI, Moscow), N. Mowlavi (ISDC), A. Goldwurm (CEA, Saclay), A. Strong (MPE, Garching), N. Lund (DSRI), J. Paul(CEA, Saclay), T. Oosterbroek (ESA/ESTEC)
We report the discovery of a new transient source, IGR J16479-4514, with the IBIS/ISGRI detector onboard the INTEGRAL observatory. The source position is RA=16h47.9m, and DEC= -45d 14' (equinox 2000, position uncertainty around 3'). The source was detected during observations of the Galactic Center field performed between August 8 and August 9, with fluxes ~12 mCrab in the 18-25 keV band (signal to noise ratio S/N ~9) and ~8 mCrab in the 25-50 keV band (S/N ~10). During later observations performed on August 10 the source temporarily increased its activity. The source flux increased by a factor ~2: detected fluxes are ~22 mCrab in the 18-25 keV energy band (S/N~9), ~21 mCrab in the 25-50 keV band (S/N~15) and ~17 mCrab in the 50-100 keV band (S/N~6).
2003-08-12 02:52:00
x-ray,gamma ray,transient,request for observations
2003-08-12
02:52:00
760
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175
177
Variable Water Maser Line in ZCMa
M. Teodorani (IRA/CNR, Italy)
M. Teodorani, Istituto di Radioastronomia, Consiglio Nazionale delle Ricerche, Bologna, reports that in April 16, 2003 a strong 22-GHz water-maser line was detected in the FUor-type protostar Z Canis Majoris. The Medicina 32-m radio telescope was used in connection with a high-resolution spectrum analyzer (8192 channels, bandwidth = 8 MHz). The beam size was 2'. The measured antenna temperature was 396 ± 26 mK, giving an integrated flux of 16.46 ± 2.7 Jy km/s. The measured FHWM = 41 KHz, corresponds to a typical maser feature. The line shows a velocity shift of -13.38 km/s with respect to the systemic velocity (Vsys = +28 km/s). The absence of any doubling of the line peak, which rules out an origin of the maser region in the Keplerian accretion disk, and the negative velocity suggests that the line is formed in a shock front produced in the approaching part of the bipolar outflow (Teodorani et al., 1997, A.Ap.S., 126, 91). The water maser line shows to be strongly variable on a yearly time-scale. Previous observations carried out by the author in Medicina showed that in May 31 and June 10, 2002, when no substantial weekly variations were recorded, the average line integrated flux was 2.02 ± 0.11 Jy km/s and the velocity shift was -13.31 km/s. It is suggested that the drastic yearly flux variability is caused by a cyclical replenishment effect of matter in the bipolar outflow, driven by ejections from the core of the accretion disc. The steadiness of visual magnitude around 10.23 ± 0.2 mag in 2002 and 2003 (courtesy: AAVSO data) and the present low-luminosity phase of ZCMa, shows that variable matter ejection with the consequent formation of maser regions characterized by different density phases, occurs in the quiescent phases too.
2003-08-13 15:34:00
radio,variables
2003-08-13
15:34:00
1,766
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176
178
INTEGRAL Detection and Improved Position of EXO 1722-363
A. Lutovinov (IKI, Moscow), M. Revnivtsev (IKI, Moscow/MPA, Garching), S. Molkov (IKI, Moscow)
We report an improved position for the X-ray pulsar X1722-363. Based on the INTEGRAL/IBIS data we derive a position of the source R.A. = 17h25.4m Decl. = -36o18' (equinox J2000.0; 2' uncertainty). This position is 9.1' away from the EXOSAT position, which was measured with accuracy of 9' (Warwick et al. 1988, MNRAS 232, 551). The source was observed with INTEGRAL observatory several times during deep observations of galactic plane in March-April 2003 and in August 2003. An averaged flux of the source during spring observations in the 15-40 keV energy band was 10-15 mCrab. Current observations of this field performed by INTEGRAL on Aug 17-19, 2003 show that the source flux is rather stable at the level of ~20 mCrab in the same energy band.
2003-08-21 01:21:00
x-ray,gamma ray,neutron star,pulsar,star
2003-08-21
01:21:00
748
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177
179
Detection of Orbital Period of EXO 1722-363
C. B. Markwardt (U. Maryland & GSFC) & J. H. Swank (GSFC)
In regards to Lutovinov et al.'s report of activity from EXO 1722-363 (ATEL #178), the source has been detected in RXTE PCA scans of the galactic center since Feb 1999. Ginga observations showed it to have a 413 s pulse period. (It was designated GPS 1722-363 by Tawara et al. 1989, PASJ, 41, 473.) Between Feb 1999 and 17 Aug 2003, the PCA scans measured a 2-10 keV flux range of 0-8 mCrab with random sampling of the pulse phase. The bulge scan observation of Aug 20.51 detected an increased 2-10 keV flux of about 15 mCrab. From 1999 to 2003, there is a 9.7 day modulation of the X-ray flux, with apparent total eclipses in the 2-10 keV band. A fit of a simple eclipse model to the flux history is consistent with the following timing ephemeris for the eclipse centers: T = T0 + N * Porb where T0 = 51988.91 +/- 0.04 MJD, Porb = 9.737 +/- 0.004 d, and N is an integer. The formal eclipse duration at minimum flux is 1.79 +/ 0.09 d. RXTE PCA pointed observations in 1998 show that the X-ray pulsations are clearly eclipsed at approximately the expected times. This reported orbital period is consistent with the lower limit of 9 days set by Takeuchi et al (1990, PASJ, 42, 287) by pulse timing with Ginga.
2003-08-21 10:29:00
x-ray,binary,neutron star,pulsar,star,transient,a comment
2003-08-21
10:29:00
1,210
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178
180
INTEGRAL observes IGR J17464-3213 in the soft state
P. Kretschmar (ISDC, Geneva & MPE, Garching), J. Chenevez (DSRI, Copenhagen), F. Capitanio (IASF/CNR, Roma), A. Orr (ESTEC, Noordwijk), G. Palumbo (Universita degli Studi di Bologna), S. Grebenev (IKI, Moscow)
The X-ray transient and black hole candidate IGR J17464-3213 (ATEL #132) = H1743-322, XTE J1746-322 (ATEL #133, #136) has been observed again during the Galactic Center Deep Exposure of the INTEGRAL Core Program. Compared to previous INTEGRAL observations the source has now changed to a soft state and is visible with the JEM-X monitor. The source fluxes were ~400 mCrab and ~120 mCrab in the energy ranges 4-6 and 6-10 keV respectively. No significant flux was detected above 20 keV neither with JEM-X nor with IBIS/ISGRI. The JEM-X spectrum can be described by a blackbody model with kT~0.88+-0.07 keV using a fixed absorption value of 2.5e22 derived from earlier observations. No power law tail is required to fit the JEM-X data. From the JEM-X observations the source position is found to be R.A. = 17h46.3m, Decl. = -32o14.4' with an uncertainty of 0.5'. This is consistent with the VLA position reported in ATEL #137.
2003-08-22 02:16:00
x-ray,gamma ray,black hole,transient
2003-08-22
02:16:00
926
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181
Possible new source IGR J17391-3021 or an outburst from XTE J1739-302
R. Sunyaev (IKI, Moscow/MPA, Garching), A. Lutovinov (IKI, Moscow), S. Molkov (IKI, Moscow), S. Deluit (ISDC)
We report a detection of a possible new transient source IGR J17391-3021 with the IBIS/ISGRI detector onboard the INTEGRAL observatory. The source position is RA = 17h39.1m, Dec = -30o21.5' (equinox 2000, uncertainty 3'). It is close to the position of the known transient source XTE J1739-302 (angular distance is ~5.5') and taking into account that uncertainty of the position of XTE J1739-302 is 4.8' (Smith et al. 1998, ApJ, 501, L181) we cannot exclude that INTEGRAL detected an outburst from XTE J1739-302. The begin of outburst was detected on Aug 26, 2003 UT18:49 at the level of ~70 mCrab in the 18-50 keV energy band. The source flux was found to be highly variable (in factor of ~10) on the timescale of thousands of seconds. Maximum flux was detected around Aug 27, 2003 UT00:44 at ~150 mCrab in the 18-50 keV band. In that moment the source was also detected in a hard energy band 50-100 keV with a flux ~50 mCrab. We encourage follow up observations at various wavelengths.
2003-08-27 22:14:00
x-ray,gamma ray,binary,transient,variables,request for observations
2003-08-27
22:14:00
989
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180
182
XTE J1739-302
D. M. Smith (UCSC), W. A. Heindl (UCSD), J. H. Swank (NASA/GSFC), T. E. Harrison (NMSU), I. Negueruela (Alicante)
XTE J1739-302, which has just been reported as in outburst by Sunyaev et al. (ATEL #181), was observed previously by Chandra, although the results have not yet been published. The accurate position is RA = 17 39 11.1, DEC = -30 20 37.6 This is close to the INTEGRAL position, increasing the probability that the current outburst is from this source. Outbursts of this object have always had durations with an upper limit of 3 to 5 days, and may be even shorter: thus followup observations should be made as quickly as possible. The optical counterpart is in the USNO A2.0 catalog, as object 0525 28760590. It is also a 2MASS source. The USNO photometry and recent infrared and optical spectroscopy (still being analyzed) suggest that the counterpart is a highly reddened O star, probably a supergiant, and almost certainly in the foreground rather than being located in the Galactic bulge. Previous observations of outbursts with RXTE (Smith et al. 1998, ApJL 501, L101 and two unpublished events) and ASCA (Sakano et al. 2002, ApJS 138, 19) suggest the possibility of a pulsation period of approximately 1500s, although the evidence is still tentative since no more than two consecutive cycles have been observed.
2003-08-28 03:00:00
infra-red,optical,x-ray,binary,star,request for observations
2003-08-28
03:00:00
1,219
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181
183
Burst activity of SGR1806-20
R. A.Sunyaev (IKI, Moscow; MPA, Garching), V. V.Zheleznyakov (API, N. Novgorod), A. M.Cherepashchuk (SAI MSU), D. A.Varshalovich (IPTI, St-Petersburg), S. V.Molkov (IKI, Moscow), A. A.Lutovinov (IKI, Moscow), S. A.Grebenev (IKI, Moscow)
During the period 24-25 Aug. 2003 a set of INTEGRAL observations of the Galactic Center was performed as a part of an Open Program. The source SGR 1806-20 was permanently in the field of view of IBIS telescope and revealed a burst activity. Several soft gamma ray bursts with different duration (40-250 ms) and intensities were detected. Two powerful bursts were localized. The first of them occurred on 2003 August 24 at 17:50:19.7 UT at coordinates R.A. = 18h08.5m, Dec.= -20d23.0m (equinox 2000, position uncertainty 3'). The second one occurred on 2003 August 25 at 03:55:00.9 UT at coordinates R.A. = 18h08.5m, Dec= -20d24.0m (equinox 2000, position uncertainty 3'). Taking into account the uncertainties of their localization they can be associated with SGR1806-20 and not with the newly discovered SGR1808-20 (GCN 2351). Both bursts with duration of about 250 ms were detected with IBIS/ISGRI in the 18-50 keV range and had a complex structure. We continue to monitor the source behavior.
2003-08-28 18:03:00
x-ray,gamma ray,gamma-ray burst,soft gamma-ray repeater
2003-08-28
18:03:00
995
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182
184
Radio observations of XTE J1739-302/IGR J17391-3021
M. P. Rupen, A. J. Mioduszewski, V. Dhawan (NRAO)
Very Large Array (VLA) observations of the transient X-ray source IGR J17391-3021 (possibly a recurrence of XTE J1739-302; ATEL #181) on August 28 UT show one radio source at 4.86 GHz within the INTEGRAL three arcminute error circle (ATEL #181), at There are no plausible counterparts to XTE J1739-302 in this radio image, as all detected sources are more than two arcminutes from the Chandra position (ATEL #182), which presumably is accurate to better than a few arcseconds. The minimum and maximum observed radio surface brightnesses within two arcseconds of that position are (-0.20,0.19) mJy/beam, after correcting for primary beam attenuation. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc.
2003-08-30 07:26:00
radio,x-ray,gamma ray,binary,transient
2003-08-30
07:26:00
811
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183
185
GRS 1758-258
R. Sunyaev (IKI, Moscow/MPA, Garching), A. Lutovinov (IKI, Moscow), S. Molkov (IKI, Moscow)
The black-hole candidate GRS1758-258 was observed with IBIS/INTEGRAL on Aug 24-29, 2003. Comparison with results of previous observations of this source with GRANAT/SIGMA, RXTE, CGRO, BeppoSAX shows that current source flux in hard X-rays is close to its maximum observed in 1990 and 1997. The averaged fluxes are equal to ~65, 80 and 115 mCrab in the 25-50, 50-100, 100-150 keV energy bands, respectively. A preliminary spectral analysis showed that the source spectrum in the 18-150 keV band can be described by a simple power-law with a photon index of ~1.6 or comptonisation model, that are typical for black hole binaries in a hard state. Wellknown black-hole candidate 1E1740.7-2942 observed simultaneously has a comparable flux. Radio and infra-red observations might give additional information about properties of the source in the state with maximal hard X-Ray luminosity.
2003-08-30 07:42:00
radio,infra-red,x-ray,gamma ray,binary,black hole,request for observations
2003-08-30
07:42:00
883
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184
186
Prompt Shutoff of XTE J1739-302
D. M. Smith (UCSC), C. B. Markwardt and J. H. Swank (NASA/GSFC), W. A. Heindl (UCSD)
RXTE was pointed directly to XTE J1739-302 between 06:06 and 06:58 UT on 28 August. Shortly afterward, a regularly-scheduled RXTE scan of the Galactic Bulge (C. Markwardt, P.I.) was performed. Neither observation detected XTE J1739-302. Precise upper limit calculations are not yet available but should be in the neighborhood of < 5 mCrab at the 3 sigma level for both methods of observation. These pointings began only 35 hours after the time quoted as the beginning of the outburst by Sunyaev et al. (ATEL #181). Five outbursts of XTE J1739-302 have been detected by RXTE in recent years, with only upper limits to their duration, ranging from 3 to 5 days (D. M. Smith et al., 2003 HEAD meeting, abstract 17.33). The unusual brevity of the current outburst suggests that it is from the same source, and it is possible that all its outbursts last on the order of a day or less.
2003-08-30 13:16:00
x-ray,gamma ray,binary,transient
2003-08-30
13:16:00
879
[ -0.09646602720022202, -0.05292988941073418, 0.05555545166134834, 0.043720804154872894, 0.06865886598825455, -0.040215037763118744, -0.026759987697005272, 0.16638542711734772, -0.05021285265684128, -0.00754510099068284, -0.025986192747950554, -0.016791721805930138, 0.08199577778577805, 0.005582901183515787, 0.004765488673001528, -0.07206939160823822, -0.059739526361227036, -0.057326722890138626, -0.0014557495014742017, 0.036910779774188995, -0.005878775846213102, 0.07988336682319641, -0.059617023915052414, 0.04078071191906929, 0.027717649936676025, 0.014271718449890614, 0.016181353479623795, -0.0746680498123169, -0.006951318122446537, -0.06478853523731232, 0.06638488173484802, 0.03389478102326393, 0.012763681821525097, -0.002154977759346366, 0.06490050256252289, 0.014324638992547989, 0.006652806419879198, -0.07643447816371918, -0.008000349625945091, -0.049305565655231476, -0.005792196840047836, 0.0003283472906332463, 0.04070306941866875, 0.05470762774348259, -0.014659330248832703, 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185
187
Hard X-ray Outburst from Rapid Burster MXB1730-335
R. Sunyaev (IKI, Moscow/MPA, Garching), S. Molkov (IKI, Moscow), A. Lutovinov (IKI, Moscow)
We report a detection of the outburst from MXB1730-335 (Rapid Burster) with the INTEGRAL observatory during the deep observation of the Galactic Center field. The source was detected on Aug 28, 2003 with a flux of ~30 mCrab in the 15-40 keV energy band. The observations on Aug 29 UT14:40 - Aug 30 UT11:30, 2003 showed that its flux increased to ~70 mCrab in the 15-40 keV energy band and 20 mCrab in the 40-100 keV energy band. According to our knowledge this is the strongest outburst in hard X-Rays during the whole history of Rapid Burster observations.
2003-08-31 07:53:00
x-ray,gamma ray,binary,neutron star,star,request for observations
2003-08-31
07:53:00
558
[ -0.07320443540811539, -0.011586041189730167, -0.00572505546733737, -0.00015146684017963707, 0.06934003531932831, -0.0432116761803627, -0.004184158518910408, 0.08965706825256348, -0.04260202497243881, -0.030771780759096146, -0.046541109681129456, -0.03617410734295845, 0.034476447850465775, 0.0014696602011099458, 0.009519094601273537, -0.04465378448367119, 0.0529869943857193, -0.08562540262937546, 0.01809755153954029, 0.013689040206372738, -0.029017742723226547, 0.027576878666877747, -0.04485032334923744, 0.051847729831933975, 0.042704056948423386, 0.04992933198809624, 0.01270489301532507, -0.05018027499318123, -0.033967673778533936, -0.06408683955669403, 0.07242819666862488, 0.028194505721330643, -0.0376773402094841, 0.009851720184087753, 0.06137503311038017, -0.0016271352069452405, -0.015852734446525574, -0.0018835475202649832, 0.0365084670484066, -0.0000018403216017759405, -0.014482428319752216, -0.059444256126880646, 0.06764459609985352, 0.012674089521169662, -0.024011414498090744, 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186
188
XTE J1810-197 is Likely an Anomalous X-ray Pulsar
C. B. Markwardt (U. Maryland & GSFC), S. Ransom (McGill), P. Woods (NSSTC), A. Ibrahim (GWU & GSFC), V. Kaspi (McGill), C. Kouveliotou (NSSTC), M. Roberts (McGill) & J. Swank (GSFC)
The recently discovered pulsar, XTE J1810-197, now also known as CXOU J180951.1-194351, AX J1809.8-1943 and 1RXS J180951.5-194345 (IAUC 8168 , IAUC 8190 ), has been observed by the RXTE PCA from 2002 to present. These observations include pointings of other targets which included XTE J1810-197 in the field of view, galactic bulge monitoring scans, and dedicated pointings. Based on galactic bulge scans, the source reached a maximum 2-10 keV flux of 3.5 mCrab in Feb 2003, declined to about 2 mCrab, and has stabilized at that level. Pulsations at 5.54 s were first detected Jan 23, 2003, and continue to the most recent observations. We have been able to construct a phase coherent solution of all the pulse times of arrival. Both polynomial and spline models are sufficient to describe the frequency evolution, with rms timing residuals of ~0.15 seconds. At the epoch of Jul 28, 2003, we find a pulse period of 5.5392993(3) s, and a mean pulse period derivative of 1.8 x 10^{-11} s/s, with significant excursions due to apparent torque noise. We formally cannot rule out a long period binary modulation (> 200 days), however such a long period and large Doppler frequency shifts would be inconsistent with most known X-ray binaries. Assuming no orbit, the period derivative is consistent with those of other anomalous X-ray pulsars. Combined with the previously reported spectral shape and pulse period (ATEL #167), we conclude that this source is also an anomalous X-ray pulsar.
2003-09-11 10:02:00
x-ray,gamma ray,binary,neutron star,pulsar,soft gamma-ray repeater,star,transient,a comment
2003-09-11
10:02:00
1,485
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-0.04028184711933136, -0.018161576241254807, 0.014667937532067299, -0.07740817219018936, 0.029194168746471405, -0.06710081547498703, -0.07970303297042847, -0.07777315378189087, -0.09837709367275238, -0.040192604064941406, 0.03188420832157135, 0.0004904518718831241, -0.04987306892871857, -0.014812435954809189, 0.04696917161345482, -0.06158621609210968, -0.03950725123286247, 0.007721907924860716, 0.013874865137040615, 0.048312388360500336, -0.08566297590732574, -0.0923345610499382, 0.010716527700424194 ]
187
189
Reactivation of IGR J17464-3213 in hard X-rays
S. A.Grebenev (IKI, Moscow), A. A.Lutovinov (IKI, Moscow), R. A.Sunyaev (IKI, Moscow/MPA, Garching)
On the basis of recent INTEGRAL observations we report on reactivation of the Galactic black hole candidate IGR J17464-3213 (=H1743-322) in the hard X-ray band. The source flared up as an X-ray nova in the end of March (ATEL #132) remains bright in soft E < 15 keV X-rays (ATEL #180). We regularly detected it with the JEM-X monitor during last 1.5 months while INTEGRAL performed deep obsevations of the Galactic center region. However with the hard X-/gamma-ray telescope IBIS we succeeded to detect this source on only September 9 for the first time. The flux measured during this and subsequent days was strongly variable on a time scale of hours with the mean level of about 15 mCrab in both 15-40 keV and 40-100 keV bands and with the peak values of 25-35 mCrab. The detailed analysis of the combined IBIS/JEM-X spectrum measured during one of such strong flares (on September 12) has shown the presence of two distinct components: a soft one which could be fitted by a multicolor disk model with kT_in ~ 1.04 keV for the fixed N_H = 2.5 x 10^{22} cm^{-2} (or a black-body model with kT ~ 0.81 keV, cf. with ATEL #180) and a hard power-law tail with the photon index of about 2.2 extended without cut-off to at least 80 keV. It is likely that the source is in process of steady transition to the hard spectral state.
2003-09-16 21:58:00
x-ray,gamma ray,black hole,nova,transient,variables
2003-09-16
21:58:00
1,323
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188
190
New source IGR J17544-2619 discovered with INTEGRAL
R. A.Sunyaev (IKI, Moscow; MPA, Garching), S. A.Grebenev (IKI, Moscow), A. A.Lutovinov (IKI, Moscow), J. Rodriguez (CEA/SAp, Saclay), S. Mereghetti (IASF, Milano), D. Gotz (IASF, Milano), T. Courvoisier (ISDC, Versoix) and the shift team
We report the discovery of a new transient source, IGR J17544-2619, with the IBIS/ISGRI detector on board the INTEGRAL observatory. The source position is RA=17h54.4m, DEC= -26d19' (equinox 2000, position uncertainty around 2'). The source was detected during an observation of the Galactic Center field on September 17, 2003 at 01h10 UTC, with a flux of about 160 mCrab, 60 mCrab and less than 15 mCrab (3-sigma upper limit) in the 18-25, 25-50 and 50-100 keV bands. The signal to noise ratio has reached ~36. The source was brigth for about 2 hours and then faded below the detection threshold. We encourage follow up observations at other wavelengths.
2003-09-17 23:15:00
radio,infra-red,x-ray,binary,black hole,neutron star,star,transient,request for observations
2003-09-17
23:15:00
655
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IGR J17544-2619 might be 1RXS J175428.3-262035
Rudy Wijnands (University of St Andrews)
Using the ROSAT All-Sky Survey Faint Source Catalogue (Voges et al. 2000, IAUC # 7432 ), it was found that the ROSAT source 1RXS J175428.3-262035 is located at the edge of the INTEGRAL error circle of the new transient IGR J17544-2619 (ATEL #190). The PSPC position listed in the Catalogue is 17h54m28.30s, -26 20' 35" (1 sigma error radius of 23") and the PSPC count rate of the source was 0.08+/-0.02 counts/s (0.1-2.4 keV). Observations at all wavelengths are encouraged to confirm the association of 1RXS J175428.3-262035 with IGR J17544-2619 and to determine the nature of this object.
2003-09-18 18:39:00
radio,infra-red,x-ray,black hole,neutron star,star,transient,request for observations
2003-09-18
18:39:00
590
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192
New outburst of IGR J17544-2619
S. A.Grebenev (IKI, Moscow), A. A.Lutovinov (IKI, Moscow), R. A.Sunyaev (IKI, Moscow; MPA, Garching)
The source IGR J17544-2619 reported in ATEL #190 was again detected in outburst during the next set of INTEGRAL observations. This outburst began on September 17, at 6h UTC and lasted 8 hours. The profile was complex and consisted of two broad peaks. The flux measured with ISGRI/IBIS in the 18-25 keV band was equal to ~45 mCrab on the average, reaching in the peaks ~60 and ~80 mCrab. In the harder 25-50 keV band the flux was detected only at these moments and was equal to ~40 and ~30 mCrab, respectively. We have no data on the source in the standard X-ray band because it was outside the JEM-X field-of-view.
2003-09-19 05:09:00
radio,infra-red,optical,x-ray,binary,black hole,neutron star,star,transient
2003-09-19
05:09:00
614
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191
193
XMM-Newton observation of XTE J1810-197
A. Tiengo (IASF Milano), S. Mereghetti (IASF Milano)
The candidate Anomalous X-ray Pulsar XTE J1810-197 (ATEL #188) has been observed with XMM-Newton on September 8, 2003 from 13:30 to 16 UT and from 17 to 17:30 UT. The 0.6-10 keV spectrum obtained with the EPIC PN camera is inconsistent with a single power law. The spectrum can be fit by a two components model consisting of a blackbody with temperature kT=0.67 +/- 0.01 keV and a power law with photon index 3.8 +/- 0.2. The 2-10 keV flux corrected for the absorption (N_H = (1.06+/-0.04) x 10^{22} cm^{-2}) is 3.3 x 10^{-11} erg cm^{-2} s^{-1}. Pulsations at P=5.53934(1) s are detected with a nearly sinusoidal light curve and a pulsed fraction of about 50%. No bursts were detected during this observation. These results strongly support the classification of this source as an AXP.
2003-09-19 23:25:00
x-ray,neutron star,pulsar,star,request for observations
2003-09-19
23:25:00
790
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0.0039564999751746655, -0.12403641641139984, 0.04857500642538071, 0.024265112355351448, -0.09959874302148819, 0.041403599083423615, 0.015725500881671906, -0.08882058411836624, 0.005971522070467472, 0.04630483314394951, -0.040046822279691696, 0.012500961311161518, -0.0017538113752380013, -0.19081681966781616, -0.0961068645119667, -0.0005301607889123261, 0.013879626989364624, -0.024254942312836647, -0.009942447766661644, 0.010852151550352573, 0.13665035367012024, -0.0747978687286377, -0.1362306922674179, 0.0017947090091183782 ]
192
194
Possible infrared/optical counterparts of IGR J17544-2619
J. Rodriguez (CEA/SAp Saclay)
J. Rodriguez, CEA/SAp, Saclay & ISDC, Versoix; L. Foschini, IASF/CNR, Bologna; T. Courvoisier, ISDC Versoix; and D. Hannikainen, Univ. of Helsinki, report on the 2MASS archival data analyses of the field of IGR J17544-2619 (Atel #190, IAUC # 8202 ). A clear source is detected in the 2MASS All-Sky Quicklook image archive (with name 2MASS J17542527-2619526) in the three bands J, H, and K, at R.A. = 17h 54m 25.28s, Decl. =-26deg 19' 52.6" (equinox 2000.0; nominal uncertainty about 0".2) -- consistent with the XMM position (IAUC # 8202 ). Magnitude estimates are J = 8.79 +-0.02, H = 8.31 +-0.03, K = 8.02 +-0.03. In addition three other fainter candidates might be in the XMM error circle, however, the 2MASS automatic processing gave bad flags for them. The most reliable one leads to H > 14.0, and K > 13.2. The brightest source (2MASS J17542527-2619526) is also reported in the USNO B1.0 Catalog (see e.g. Monet et al. 2003, AJ, 125, 984), with B=14.52 +-0.3, R=11.29 +-0.3 (POSS epoch I 1949-1965), and B=13.9 +-0.3, R=11.9 +-0.3 (POSS epoch II 1985-2000), and I= 10.4 +-0.3. Other observations are strongly encouraged to identify the counterpart.
2003-09-20 20:01:00
infra-red,optical,binary,transient,request for observations
2003-09-20
20:01:00
1,156
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193
195
Optical Observations of XTE J1810-197 and SGR 1806-20
Solen Balman (METU, Ankara), Samar Safi-Harb (U. of Manitoba, Canada), Alaa I. Ibrahim (NASA/GSFC & GWU), Jean H. Swank (NASA/GSFC), Craig Markwardt (NASA/GSFC & UMD)
We have observed the Chandra error boxes of the newly discovered Anomalous X-ray Pulsar candidate XTE J1810-197 (also known as CXOU J180951.1-194351; IAUC 8168 , IAUC 8190 ) and the Soft Gamma Repeater SGR 1806-20 (Kaplan et al. 2002) with the 1.5 m Russian-Turkish Telescope, RTT150 (Antalya, Turkey) on 2003 September 3 and 6. Optical Cousins R filter images of both fields were obtained using the ANDOR CCD (2048x2048 pixels, 0.24" pixel scale and 8'x8' Field of View) with 15 min exposure times for XTE J1810-197 (3 frames) and 3 min exposure times for SGR 1806-20 (9 Frames). Seeing was about 2". The data was reduced using ESO-MIDAS software with standard cleaning and calibration processes and photometry was performed on each and/or aligned and merged images to obtain stellar magnitudes. We do not detect an optical counterpart for either of the sources. Our analysis shows that a limiting magnitude of 21.5 (2 sigma) in the Rc band is achieved for both of the X-ray sources. Since SGR 1806-20 was intermittently burst-active from July 14 to the time of the observation, this is a limit on the optical magnitude during a (mild) SGR active phase. The derived upper limit rules out any main sequence or giant star as a counterpart for the sources and would be consistent with a magnetospheric origin for the optical emission from AXPs and SGRs. It is compatible with the other non-detections/upper limits (>23.5 mag) placed on AXPs in the optical wavelengths (Israel et al. 2002; 2003; Hulleman et al. 2001) - except for 4U0142+61, for which an optical counterpart was identified (Hulleman et al. 2000). This supports the proposed AXP nature of XTE J1810-197 and the conjectured connection between AXPs and SGRs as magnetars. This telegram is citable
2003-09-27 05:19:00
optical,x-ray,gamma ray,magnetar,neutron star,pulsar,soft gamma-ray repeater,star
2003-09-27
05:19:00
1,757
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194
196
GX 339-4 in a very low luminosity state
Elena Gallo, Rob Fender (U Amsterdam) & Stephane Corbel (U Paris VII & CEA Saclay)
A 30 ksec Chandra ACIS-S observation on MJD 52911 reveals the black hole X-ray binary GX 339-4 to have entered a very low luminosity state following a more than 2-year-long outburst period (ATEL #85, #95, #107, #120). The X-ray spectrum is well fitted by an absorbed power-law with photon index 2+/-0.2 and absorption column N_H=7+/-1x10e21 cm^-2. The (unabsorbed) 0.4-11 keV flux is of 3.8e-13 erg sec^-1 cm^-2, with a corresponding luminosity of 4.6e31x(d/kpc)^2 erg sec^-1, comparable to the faintest ever measured from GX 339-4. Simultaneous radio observations with the Australia Telescope Compact Array did not detect the source to an rms noise level of 0.015 mJy/beam at 4.8 GHz.
2003-10-03 23:48:00
radio,x-ray,binary,black hole,transient
2003-10-03
23:48:00
685
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195
197
New Outburst in Recurrent X-ray transient (MX0656-072 = XTEJ0658-073)
Ron Remillard (MIT) and Frank Marshall (GSFC), for the RXTE ASM team
The soft X-ray transient, "MX0656-072", has begun a new X-ray outburst. Observations with the RXTE All-Sky Monitor reveal a slowly increasing flux during the last 7 days, reaching a value of 75 (5) mCrab at 2-12 keV on 2003 October 18. The ASM position is consistent with the 3' error box (J2000 center in degrees: 104.612, -7.263) produced by Ariel V during the 1975-1976 outburst. The current X-ray flux is similar to the peak value (80 mCrab) seen in sparse measurements of the first outburst (see Liu et al. 2001, A&A 368, 1021). Observations at optical and other wavelengths are strongly encouraged.
2003-10-19 02:29:00
radio,optical,x-ray,binary,transient,request for observations
2003-10-19
02:29:00
604
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196
198
H 1743-322 (= IGR J17464-3213) Transition to the Hard State
John A. Tomsick (UC San Diego) & Emrah Kalemci (UC Berkeley)
The black hole candidate X-ray transient H 1743-322 (= IGR J1746-3213 = XTE J17464-3213) that began its current outburst on 2003 March 21 (ATEL#132) appears to be in the process of making a transition to the hard state. We have been monitoring this source several times per week with RXTE since 2003 Sept. 24 UT, a couple weeks after hard X-ray flux was detected from the source by INTEGRAL (ATEL#189). During our monitoring observations, the 3-25 keV PCA count rate dropped by a factor of 3, while the energy spectra are well-described by the canonical disk-blackbody plus power-law model with an inner disk temperature of 0.75-0.90 keV and a power-law photon index of 2.0-2.4. Although the spectral parameters have not shown major changes, the ratio of the power-law flux to the total flux (both in the 3-25 keV band) gradually increased from 0.34 on Oct. 15 to 0.79 during our most recent observation on Oct. 20, 2-3 hours UT. We measured a 3-25 keV absorbed flux of 1.65E-9 erg cm^-2 s^-1 on Oct. 20. In addition, we detected timing noise for the first time at an rms level of 7% on Oct. 18, increasing to an rms level of 11.0% +/- 0.1% for the continuum component on Oct. 20. We also detected a 7.8 Hz QPO and its harmonic during the most recent observation. These changes indicate that the source is making the transition to the hard state, and, based on the behavior of other systems, we predict that H 1743-322 will reach the hard state in a time period of a few days to a couple weeks. Black hole X-ray transients typically become bright at radio wavelengths in the hard state, and multi-wavelength observations are strongly encouraged. More RXTE observations are scheduled.
2003-10-21 04:23:00
radio,x-ray,black hole,transient,request for observations
2003-10-21
04:23:00
1,683
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XTEJ0658-073 (=MX0656-072) is a Pulsar
Ed Morgan(MIT), Ron Remillard(MIT) and Jean Swank(GSFC) for the RXTE team
Observations of XTEJ0658-073 with the RXTE PCA on 2003 October 19-20 indicate that the source is a pulsar with an spin period of 160.7 s. The pulse fraction is 15% (rms) at 3-30 keV. The intensity continues to rise, as the ASM measures 120 mCrab (2-12 keV) on October 21. The PCA spectrum and the ASM hardness ratio (HR2) suggest a spectral shape that is typical of accretion-powered pulsars. Descriptions of the 1975 outburst of MX0656-072 as that of a "soft X-ray transient" may have been misleading (see Clark, 1975 IAUC # 2843 ). An improved source position would be valuable, to confirm that the source lies within the 3' error circle provided by Ariel V during 1975.
2003-10-22 03:09:00
x-ray,neutron star,pulsar,star,transient
2003-10-22
03:09:00
672
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Cyclotron Line in XTE J0658-073
William Heindl (UCSD/CASS), Wayne Coburn (UCB/SSL), Ingo Kreykenbohm (IAAT/ISDC), Joern Wilms (IAAT)
Joint RXTE PCA and HEXTE spectral analysis of the 2003 October 20 observation of the 160.7 second accreting pulsar XTE J0658-073 (Morgan et al. 2003, ATEL #199) reveals a strong cyclotron line at ~35keV. We fit a range of continuum models typical of accreting pulsars to the pulse phase averaged spectra. In all cases, significant residual deviations characteristic of a cyclotron feature were detected above ~20keV. To determine spectral parameters, we used a power law which breaks smoothly to a power law times an exponential, modified by an absorption line with a Gaussian optical depth profile (MPLCUT*GABS, Coburn et al. 2002, ApJ, 580, 394), plus an iron line. The resulting parameters are, (continuum): photon index = (1.09 +/- 0.01), break energy = (16.8 +/- 0.1)keV, exponential folding energy = (11.5 +/- 0.3)keV, (cyclotron line): energy = (36 +/- 1)keV, sigma = (7.5 +/- 1.0)keV, central optical depth = (0.33 +/- 0.05). These parameters are typical of cyclotron line pulsars. The line centroid implies a magnetic field of 3E12*(1 + z) G (z is the gravitational redshift at the line-forming region).
2003-10-24 04:19:00
optical,x-ray,neutron star,pulsar,star,transient
2003-10-24
04:19:00
1,112
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