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Issue A&A
Volume 437, Number 2, July II 2005
Page(s) L27 - L30
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361:200500131



A&A 437, L27-L30 (2005)
DOI: 10.1051/0004-6361:200500131

Letter

Detection and analysis of a new INTEGRAL hard X-ray transient, IGR J17285-2922

E. J. Barlow1, A. J. Bird1, D. J. Clark1, R. Cornelisse1, A. J. Dean1, A. B. Hill1, L. Moran1, V. Sguera1, S. E. Shaw1, 2, D. R. Willis1, F. Capitanio3, M. Del Santo3 and L. Bassani4

1  School of Physics and Astronomy, University of Southampton, Highfield, SO17 1BJ, UK
    e-mail: ejb@astro.soton.ac.uk
2  INTEGRAL Science Data Centre, 1290 Versoix, Switzerland
3  IASF/CNR, via del Fosso del Cavaliere 100, 00133 Roma, Italy
4  IASF/CNR Section of Bologna, via P. Gobetti 101, 40129 Bologna, Italy

(Received 15 March 2005 / Accepted 22 May 2005)

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 14$\sigma$ 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 $\Gamma=2.1 \pm0.17$; 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.


Key words: gamma-rays: observations -- surveys -- X-rays: individuals: IGR J17285-2922 -- X-rays: binaries

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© ESO 2005


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