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Chandra observes IGR J17497-2821

ATEL # 907; A. Paizis (IASF Milano), M. A. Nowak (MIT-CXC), J. Rodriguez (CEA Saclay), J. Wilms (Department of Physics, University of Warwick), T. J.-L. Courvoisier (ISDC Geneva), M. Del Santo, P. Ubertini (IASF Roma), K. Ebisawa (ISAS, Japan)
on 3 Oct 2006; 12:17 UT
Password Certification: Adamantia Paizis (

Subjects: Radio, Far-Infra-Red, Infra-Red, Optical, X-ray, Gamma Ray, A Comment, Binaries, Black Holes, Neutron Stars, Nova, Pulsars, Transients, Variables

On October 1st, 17:42 UT, Chandra has performed a 20ksec HETGS observation of the source IGR J17497-2821 recently discovered by INTEGRAL (Soldi et al., ATEL #885). Our preliminary position estimate is (J2000) RA: 17 49 38.04, Dec: -28 21 17.4. As the source is quite bright, the positioning reaches the Chandra absolute astrometric accuracy that is usually better than 1". Thus our reported position is expected to be accurate to within this value, dominated by current systematic uncertainties which are likely to improve with further analysis. Our position is consistent with the Swift refined position by Kennea et al (ATEL #900, 0.94" away) and our improved error circle allows, among all the currently proposed counterparts (Chaty et al., ATEL #897, #906) only "Candidate 1" at RA=17 49 38.08, DEC=-28 21 17.6 (0.57" apart, Chaty et al., ATEL #906) as the most probable counterpart of IGR J17497-2821. Preliminary analysis shows the source to be at 3.1x10^-10 ergs cm^-2 s^-1 in the 1-8 keV band with N_h = 4.2+/-0.1 10^22 cm^-2 and Gamma = 1.15+/-0.05. More details will be given in a forthcoming paper.

We thank the INTEGRAL Science Data Centre staff and in particular Simona Soldi, Nami Mowlavi and Simon Shaw as well as Erik Kuulkers (ESA/ESAC) for keeping us up to date on the near real time source behavior as seen in our INTEGRAL observations.

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R. E. Rutledge , Editor
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