Swift/XRT observation of IGR J16597-3704

ATel #10881; 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 23 Oct 2017; 09:52 UT
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Credential Certification: E. Bozzo (enrico.bozzo@unige.ch)

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Following the discovery of the new INTEGRAL transient IGR J16597-3704 (ATel #10880), a target of opportunity observation with Swift/XRT has been carried out on 2017 October 22 for a total exposure time of 1 ks.

A single bright X-ray source is detected within the INTEGRAL error circle. The best determined position of this source provided by the on-line tool (Evans et al. 2009, MNRAS, 397, 1177) is at RA=254.8870 DEC=-37.1207 (J2000), with an associated uncertainty of 3.6 arcsec.

The source spectrum could be well described by an absorbed power law with a photon index of 1.3+/-0.2. The estimated absorption column density is of 1.4E22 cm^-2. The 0.3-10 keV flux at the time of the observation was 2.7E-10 erg/cm^2/s (not corrected for absorption).

The XRT accurate localization of the INTEGRAL transient places the source within the globular Cluster NGC 6256.

Multi-wavelength observations are encouraged.

We are grateful to the Swift team for the rapid scheduling of the ToO observation.