Chandra observations of IGR J16316-4028
ATel #253; J. Rodriguez (CEA/SAp, France & ISDC Switzerland), L. Foschini (IASF, Italy), A. Goldwurm (CEA), V. Beckmann (GSFC, USA), K. Ebisawa (GSFC & ISDC)
on 19 Mar 2004; 13:34 UT
Distributed as an Instant Email Notice Transients
Credential Certification: Jerome Rodriguez (jrodriguez@cea.fr)
Subjects: X-ray, Gamma Ray, Request for Observations, Binary, Black Hole, Nova, Neutron Star, Transient, Pulsar
We report on a Chandra Director Discretionary Time observation of the region around
IGR J16316-4028 (see Rodriguez and Goldwurm Atel #201) performed on January 18, 2004,
13:01 UT. The analysis of HRC-I data did not reveal any significant (> 3sigma) excess
in the field of view (30" X 30"), with an upper limit in flux of 5 10-14
erg.cm-2.s-1 in the 0.5-10 keV energy range.
We further report on the spectral analysis of the INTEGRAL/IBIS observation
performed on February 28, 2003. The source had a power law like spectrum
of photon index 2.7 (+0.2 -0.3 at 3 sigma) and an average 20-100 keV flux of
1.2 10-10 ergs.cm-2.s-1. This suggests that
IGR J16316-4028 was flaring at the time of its discovery
(extrapolated 0.5-10 keV flux of 2.3 10-9 ergs.cm-2.s-1),
and was in quiescence during the Chandra observation.
The planned scans of this sky region with INTEGRAL
will possibly allow the source to be detected during
future outburst/flares.
The authors are grateful to H. Tananbaum for the generous and prompt
allocation of DDT and to the CXC for the rapid data processing and
delivery.
