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A new hard X-ray transient discovered by INTEGRAL: IGR J17361-4441

ATel #3565; L. Gibaud (ISDC, Switzerland) A. Bazzano (INAF/IASF Rome, Italy), E. Bozzo (ISDC, Switzerland), M. Cadolle-Bel (ESA/ESAC, Spain), F. Capitanio, M. Del Santo (IASF-Roma, Italy) P. R. den Hartog (Stanford University HEPL, USA), C. Ferrigno (ISDC, Switzerland), I. Kreykenbohm (Dr. Karl Remeis-Sternwarte & ECAP, Germany), A. Paizis (IASF-Milano, Italy), G. Puehlhofer (IAA-Tuebingen, Germany), J. Rodriguez (CEA, France), C. Sanchez (ESA/ESAC, Spain) K. Watanabe (FGCU, USA)
on 17 Aug 2011; 12:10 UT
Distributed as an Instant Email Notice Transients
Credential Certification: Carlo Ferrigno (Carlo.Ferrigno@unige.ch)

Subjects: X-ray, Request for Observations, Globular Cluster, Transient

Referred to by ATel #: 3566, 3595, 3617, 3627, 3958

INTEGRAL discovered a new hard X-ray transient, IGR J17361-4441, during the observations performed from 2011-08-11 22:45 to 2011-08-15 07:39 UTC.

The source is detected in the IBIS/ISGRI mosaic at a preliminary significance level of 8 in the 20-40 keV energy band. The corresponding flux is 7±1 mCrab (68% c.l., only statistical).

The best determined source position is at RA=264.046; DEC=-44.689 (J2000) with a 90% confinement radius of 3 arcmin. Within the error box, we notice the presence of the globular cluster NGC 6388.

The IBIS/ISGRI spectrum (exposure time 162 ks) can be well described (χ2red/d.o.f.=0.7/9) by a a power-law with photon index Γ=2.6+1.0-0.7 (90% c.l.). The 20-100 keV flux estimated from the spectral fit is ~9.7e-11 erg/s/cm2.

Unfortunately, IGR J17361-4441 was located out of the JEM-X field of view. Follow-up observations are encouraged to unveil the nature of this transient.