Detection and analysis of a new INTEGRAL hard X-ray transient, IGR J17285-2922
Hill, A. B.; Capitanio, F.; Bird, A. J.; Bassani, L.; Clark, D. J.; Dean, A. J.; Del Santo, M.; Sguera, V.; Willis, D. R.; Shaw, S. E.; Barlow, E. J.; Cornelisse, R.; Moran, L.
United Kingdom, Switzerland, Italy
Abstract
We present the transient nature of INTEGRAL source IGR J17285 2922, identified from a single period of activity during an IBIS/ISGRI Galactic Centre Deep Exposure in September 2003. The source has a maximum detection significance of 14σ in the 20 100 keV energy range and exhibits a flux of 6.5 mCrab before it moves out of the ISGRI field of view. The source is visible to at least 150 keV and its spectrum can be fit with a power law slope of Γ=2.1 ±0.17; a more physical model could not be fit due to poor statistics. Detected characteristics are consistent with the source being a Galactic low-mass X-ray binary harbouring a black hole or neutron star.