INTEGRAL discovered a new hard X-ray source: IGRJ17511-3057

C. Baldovin, E. Kuulkers, C. Ferrigno, E. Bozzo, Jérôme Chenevez, Søren Kristian Brandt, V. Beckmann, A. Bird, A. Domingo, K. Ebisawa, P. Jonker, P. Kretschmar, C. Markwardt, T. Oosterbroek, A. Paizis, D. Risquez, C. Sanchez-Fernandez, S. Shaw, R. Wijnands

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During the latest observations of the Galactic Bulge monitoring (see ATel #438), carried out between 2009-09-12 03:21:34 and 2009-09-12 05:27:22 (UTC), INTEGRAL discovered a new bright hard X-ray source, which we designate IGRJ17511-3057. The source is detected in the INTEGRAL/IBIS mosaic image with a significance of 14 sigma in the 20-40 keV energy band, and 7 sigma in the 40-80 keV energy band. The corresponding count rates in these bands are 4.2+/0.3 cts/s (28 mCrab) and 1.8+/-0.3 cts/s (25 mCrab), respectively. The source is also detected in the JEM-X mosaic in the three energy bands 3-7 keV, 7-11 keV, and 11-20 keV. The source flux is ~20 mCrab and the detection significance is 3 sigma in all bands. The best determined source position is RA: 267.811 DEC: -30.954 (J2000), with a 90% error radius of 2.0 arcmin. The combined IBIS/ISGRI and JEM-X spectrum in the 3-100 keV energy range is well described by a single power-law with photon index 2.0+/-0.2. The source flux is 5.7e-10 erg/cm2/s in the 3-20 keV energy band and 4.8e-10 erg/cm2/s in the 20-100 keV energy band.
Original languageEnglish
JournalThe Astronomer´s Telegram
Publication statusPublished - 2009


  • Transients
  • Gamma Ray
  • X-ray
  • Request for Observations

Cite this

Baldovin, C., Kuulkers, E., Ferrigno, C., Bozzo, E., Chenevez, J., Brandt, S. K., Beckmann, V., Bird, A., Domingo, A., Ebisawa, K., Jonker, P., Kretschmar, P., Markwardt, C., Oosterbroek, T., Paizis, A., Risquez, D., Sanchez-Fernandez, C., Shaw, S., & Wijnands, R. (2009). INTEGRAL discovered a new hard X-ray source: IGRJ17511-3057. The Astronomer´s Telegram, #2196.