IGR J18245-2452: a new hard X-ray transient discovered by INTEGRAL

ATel #4925; D. Eckert (ISDC, Switzerland), M. Del Santo, A. Bazzano (INAF/IAPS Rome, Italy), K. Watanabe (FGCU, USA), A. Paizis (INAF-Milano, Italy), E. Bozzo, C. Ferrigno (ISDC, Switzerland), I. Caballero (CEA, France), L Sidoli (INAF-IASF Milano, Italy), L. Kuiper (SRON, Netherlands)
on 29 Mar 2013; 11:18 UT
Distributed as an Instant Email Notice Transients
Credential Certification: E. Bozzo (enrico.bozzo@unige.ch)

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During the observations of the Galactic Center performed on 2013 March 28 from 2:56 to 17:38 (UTC), the hard X-ray imager IBIS on-board INTEGRAL detected a new transient source, dubbed IGR J18245-2452, at:
RA=276.1383
DEC=-24.8793
with an associated uncertainty of 1.4 arcmin (all uncertainties are given at 90% c.l.).

The source is detected at a significance level of 21 sigma in the 20-40 keV energy band and 15 sigma in the 40-80 keV energy band. The corresponding fluxes estimated from the ISGRI mosaic are 45.8+/-2.0 mCrab and 44.0+/-2.8 mCrab, respectively.

The ISGRI spectrum (effective exposure time 32 ks) can be reasonably well fit with a power-law model. We estimated a photon index of 2.1+/-0.2. and a 20-100 keV X-ray flux of 9E-10 erg/cm^2/s.

The source was outside the JEM-X FOV during the entire observation.

We note that the ISGRI position of the source is compatible with that of the Globular Cluster M 28.

Further INTEGRAL observations of the region around IGR J18245-2452 are already scheduled for the next days.

Multi-wavelength follow-up observations of IGR J18245-2452 are encouraged.