[ Previous | Next | ADS ]

IGR J16597-3704: a new X-ray transient discovered by INTEGRAL

ATel #10880; E. Bozzo (ISDC, Switzerland), V. Grinberg (ESA/ESTEC, Netherlands), J. Wilms (Remeis-Observatory & ECAP, Germany), C. Ferrigno (ISDC, Switzerland), A. Paizis, L. Sidoli (INAF/IASF Milano, Italy), M. Fiocchi (INAF-IAPS, Italy)
on 22 Oct 2017; 19:12 UT
Distributed as an Instant Email Notice Transients
Credential Certification: E. Bozzo (enrico.bozzo@unige.ch)

Subjects: X-ray, Transient

Referred to by ATel #: 10881, 10885, 10894, 10898

During the observations of the Galactic Center performed from 2017 October 21 at 08:40 to 23:22, a new X-ray transient has been discovered by INTEGRAL.

The best determined source position provided by IBIS/ISGRI is at: RA=254.93 Dec=-37.08 (J2000), with an associated uncertainty of 3.2 arcmin (90% c.l.).

At the best of our knowledge, no other X-ray transient was previously identified at this position and thus we named the source IGR J16597-3704.

The source was detected in the 20-40 keV IBIS/ISGRI mosaic at a significance level of 8 sigma. The estimated flux from the 20-40 keV mosaic is 13.9+/-1.7 mCrab (roughly 1.1E-10 erg/cm^2/s). The ISGRI spectrum of the source (effective exposure time 30.6 ks) could be well described by using a power-law with a photon index of 3.2 (-1.4, +3.5). The 20-100 keV flux measured from the fit is 1.4E-10 erg/cm^2/s.

The source was located at the rim of the JEM-X field of view for the entire observational period and not detected.

Further observations of the source with INTEGRAL are planned in the coming days. A Swift/XRT target of opportunity observation has been already requested and scheduled.