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Swift/XRT localization of IGRJ17559-2612

ATel #4322; E. Bozzo, C. Ferrigno, V. Esposito (ISDC - University of Geneva, Switzerland), M. Cadolle-Bel (ESA/ESAC), M. Del Santo (INAF/IAPS, Italy), K. Watanabe (Florida Gulf Coast University, USA)
on 20 Aug 2012; 21:57 UT
Credential Certification: E. Bozzo (enrico.bozzo@unige.ch)

Subjects: X-ray, Gamma Ray, Binary, Black Hole, Neutron Star, Transient

Referred to by ATel #: 4342

The recently discovered INTEGRAL hard X-ray transient IGRJ17559-2612 (Atel #4309) was observed with Swift/XRT starting from 2012 August 17 at 00:00 for a total exposure time of about 1 ks. A single source is detected within the INTEGRAL error circle. The best determined XRT position is at:

RA= 268.9915

DEC= -26.2300

(J2000), with an associated uncertainty of 3.6 arcsec (at 90% c.l.).

The XRT spectrum could be well described (reduced chi^2/d.o.f. = 0.8/9) with an absorbed power-law model. We measured an absorption column density of (6.0-4.0+5.0)E22 cm^(-2) and a power-law photon index of 1.4(-0.9+1.0). The 1-10 keV X-ray flux is 4.4E-11 ergs/cm^2/s (not corrected for absorption).

We could not find any obvious counterpart to the source in the optical domain. The closest catalogued 2MASS objects to IGRJ17559-2612 are J17555833-2613457 (J=15.618+/-0.084; H=13.497+/-0.082; K=12.753+/-0.082) and J17555783-2613530 (J=15.585+/-0.083; H=13.750+/-0.047; K=12.810+/-0.051), both lying just outside the XRT 90% c.l. error circle.

We thank the Swift team for having performed this observation.