IGR J17464-3213 (= H1743-322) is active again

E. Kuulkers*, J. Chenevez, D. Altamirano, J. Alfonso-Garzon, V. Beckmann, T. Bird, S. Brandt, T. Courvisier, A. Domingo, K. Ebisawa, P. Jonker, P. Kretschmar, C. Markwardt, T. Oosterbroek, A. Paizis, C. Sanchez-Fernandez, R. Wijnands

*Corresponding author for this work

Research output: Other contributionNet publication - Internet publicationResearch


The INTEGRAL Galactic bulge (GB) monitoring program observations on UT April 6, 2011, 04:11-07:53 show that IGR J17464-3213 (= H1743-322) started another outburst. The observed JEM-X fluxes are 11 +/- 2 and 26 +/- 4 mCrab in the 3-10 and 10-25 keV energy bands, respectively, while the observed IBIS/ISGRI fluxes are 34 +/- 2 and 57 +/- 3 mCrab in the 18-40 and 40-100 keV energy bands, respectively. The source is clearly in a hard state. Previous GB observations (April 3, 15:13-19:21) did not reveal any significant emission, with JEM-X and IBIS/ISGRI upper limits of about 3 and 10 mCrab (5 sigma), respectively, in the above quoted energy bands. Swift/BAT observations indicate the outburst started around April 5. The source is also seen in the latest RXTE/PCA Galactic Center scan observations at April 6, 18:10: 15+/-1 mCrab (2-10 keV). The last outburst of this source was in Aug/Sep 2010 (ATels #2774, #2781, #2788, #2792, #2797, #2857). We encourage follow-up observations at all wavelengths.
Original languageEnglish
Publication date7 Apr 2011
Publication statusPublished - 7 Apr 2011
SeriesThe Astronomer's telegram
NumberATel #3263


  • Transient
  • Variables
  • Binary
  • Black Hole
  • X-ray


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