INTEGRAL detection of high energy emission from XMMSL1 J171900.4-353217

ATel #2803; W. Ishibashi, E. Bozzo (ISDC), R. Terrier (CNRS/APC France), S. Mereghetti, A. Paizis, L. Ducci (INAF-IASF Milano), D. Gotz (CEA Saclay), A. Bazzano, M. Fiocchi, A. De Rosa, A. Tarana, M. Del Santo, L. Natalucci, F. Panessa, F. Capitanio (INAF-IASF, Rome), V. Sguera, V. Bianchin (INAF-IASF, Bologna), K. Watanabe (FGCU), L. Kuiper (SRON), L. Barragan (FAU), J. Chenevez (DTU), I. Caballero (CEA Saclay), C. Shrader (GSFC/USRA), A. Bird (Southampton), G. Puehlhofer (IAA Tuebingen), C. Sanchez-Fernandez (ESAC), G. Skinner (CRESST/GSFC/UMCP), P. R. den Hartog (HEPL/KIPAC), K. Pottschmidt (UMBC/NASA GSFC), I. Negueruela (Alicante), L. Prat (CEA Saclay)
on 18 Aug 2010; 13:20 UT
Distributed as an Instant Email Notice Transients
Credential Certification: Nami Mowlavi (Nami.Mowlavi@obs.unige.ch)

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During the observations of the SNR RXJ1713.7-3946, performed from 2010 August 12 at 00:14 to 2010 August 14 at 16:02 (UTC; PI R. Terrier), INTEGRAL detected hard X-ray emission from a position consistent with that of the recently discovered transient XMMSL1 J171900.4-353217.

The source was within the IBIS/ISGRI FOV for a total exposure time of 170 ks and was detected at a significance level of 6.5 sigma (20-40 keV energy band). The best fit position obtained from the OSA software is at RA: 259.738 DEC: -35.508 (J2000), with an associated error of 3.9 arcmin. The ISGRI spectrum is best fit with a power-law model of photon index Gamma=2.7-0.9+1.3 and the estimated flux is 3.0e-11 ergs/cm^2/s (20-40 keV energy band). The count-rate of the source slightly increased in the latest part of the observation. XMMSL1 J171900.4-353217 was not detected in the ISGRI hard energy band (40-80 keV) and the estimated 3 sigma upper limit on the X-ray flux is 4 mCrab.

The source was also in the Jem-X FOV (total exposure time 24 ks), but not detected. We estimated a 3 sigma upper limit on the source flux of 6 mCrab (3-10 keV energy band).

Further INTEGRAL observations of the region comprising XMMSL1 J171900.4-353217 are ongoing. A Swift follow-up observation has been requested.