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A new hard X-ray transient discovered by INTEGRAL: IGRJ17498-2921

ATel #3551; L. Gibaud (ISDC, Switzerland), A. Bazzano (INAF/IASF Rome, Italy), E. Bozzo (ISDC, Switzerland), M. Cadolle-Bel (ESA/ESAC, Spain), J. Chenevez (DNSC, Denmark), S. P. Drave (Univ. of Southampton, UK), C. Ferrigno (ISDC, Switzerland), D. Gotz (CEA, France), M. Kadler (Institut fur Theoretische Physik und Astrophysik Universitat Wurzburg, Dr. Karl Remeis Observatory and ECAP, Germany), I. Kreykenbohm (Dr. Karl Remeis Observatory and ECAP, Germany), G. Puehlhofer (IAA-Tuebingen, Germany), J. Rodriguez (CEA, France), C. Sanchez-Fernandez (ESA/ESAC, Spain), K. Watanabe (FGCU, USA)
on 12 Aug 2011; 17:35 UT
Distributed as an Instant Email Notice Transients
Credential Certification: E. Bozzo (enrico.bozzo@unige.ch)

Subjects: X-ray, Gamma Ray, Binary, Black Hole, Neutron Star, Transient

Referred to by ATel #: 3555, 3558, 3560, 3561, 3562, 3563, 3568, 3601, 3606, 3622, 3634, 3638, 3643, 3646, 3661

INTEGRAL discovered a new hard X-ray transient, IGR J17498-2921, during the observations performed from 2011-08-11 22:45 to 2011-08-12 05:54 UTC.

The source is detected in the IBIS/ISGRI mosaic at a preliminary significance level of 11 and 9 sigma in the 20-40 keV and 40-80 keV energy bands, respectively. The corresponding fluxes are 19+/-2 and 23+/-3 mCrab (68% c.l., only statistical).

The best determined source position is at RA=17:49:49; DEC=-29:21:14 (J2000) with a 90% confinement radius of 2.3 arcmin.

The IBIS/ISGRI spectrum (exposure time 15.9 ks) can be well described by a a power-law with photon index 1.9+/-0.4 (90% c.l.). The estimated 20-100 keV flux from the spectral fit is ~3.4e-10 erg/s/cm2.

Unfortunately, IGR J17498-2921 was located at the border of the JEM-X field of view (FOV) and thus we can not report yet on its detection at low energy (2-25 keV).

Further INTEGRAL observations of the FOV around IGR J17498-2921 are planned for the next days.