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IGR J17591-2342: Swift/XRT localization and characterization

ATel #11942; E. Bozzo, L. Ducci, C. Ferrigno, V. Savchenko (ISDC, Switzerland), E. Kuulkers (ESA/ESTEC, Netherlands), V. Grinberg (IAAT, Germany), A. Paizis, L. Sidoli (INAF-IASF Milano, Italy)
on 12 Aug 2018; 14:14 UT
Credential Certification: E. Bozzo (enrico.bozzo@unige.ch)

Subjects: X-ray, Transient

Referred to by ATel #: 11946, 11954, 11957, 11970, 11981

Following the discovery of the new INTEGRAL transient IGRJ17591-2342 (ATel #11941), a ToO observation with Swift/XRT was requested in order to improve the determination of the source position and to characterize its soft X-ray emission.

Swift/XRT observed the field around IGRJ17591-2342 starting from 12 August 2018 at 03:49 for about 1 ks. A single X-ray source was detected within the uncertainty circle derived from IBIS/ISGRI. The best position determined by XRT (we used the online Swift-XRT data product tool; Evans et al. 2009, MNRAS, 397, 1177):

RA, Dec (J2000): 269.7622, -23.7195,

with an associated uncertainty of 3.6 arcsec (at 90% c.l.).

The Swift/XRT spectrum could be preliminary described by an absorbed power-law with photon index of 1.7+/-0.3 and an absorption column density of (4.2+/-0.8)x1E22 cm^-2. The 0.3-10 keV flux (not corrected for absorption was (2.6+/-0.2)x1E-10 erg/cm^2/s.

Additional monitoring observations with Swift/XRT have been requested. We are grateful to the Swift team for the very rapid scheduling of the ToO observation of IGR J17591-2342.