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A Chandra observation of IGR J18179-1621

ATel #3988; A. Paizis (INAF-IASF Milano, Italy), M. Nowak (MIT-CXC, USA), J. Rodriguez (CEA Saclay, France), J. Wilms (University of Erlangen-Nuremberg, Germany), E. Bozzo (ISDC, University of Geneva, Switzerland), S. Chaty (CEA Saclay, France), P. Ubertini (INAF/IAPS, Roma, Italy)
on 21 Mar 2012; 10:45 UT
Distributed as an Instant Email Notice Transients
Credential Certification: Adamantia Paizis (ada@iasf-milano.inaf.it)

Subjects: Radio, Far-Infra-Red, Infra-Red, Optical, X-ray, Gamma Ray, A Comment, Binary, Neutron Star, Transient, Variables

Following the discovery of IGR J18179-1621 (Tuerler et al. 2012, ATel #3947) on 2012-02-29, we triggered our Chandra HETGS ToO observation. Due to a solar flare, our observation could be executed only starting from 2012-03-17T23:09 until 2012-03-18T05:17, for a total exposure time of about 20 ksec.

We obtain an absorbed 1-8 keV flux of about 1.6 10-11 erg/s/cm2.

The derived J2000.0 Chandra position is
RA: 18 17 52.19
DEC: -16 21 31.7

We estimate the error of the source position to be 0.6", the typical 90% uncertainty of Chandra aspect solution.

Our position is 0.37" away from that obtained by Li et al. (2012, 2.2" error at 90%, ATel #3950) and 0.09" from the 2MASS J18175218-1621316 source (K=13.136mag), already mentioned by Li et al. (2012), which the Chandra position confirms as the candidate counterpart to IGR J18179-1621.