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 (email@example.com)
Subjects: X-ray, Transient
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
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.