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Swift-XRT detection of IGR J17098-3626

ATel #476; J. A. Kennea, D. N. Burrows, J. A. Nousek, M. Chester (PSU), S. Barthelmy, N. Gehrels (GSFC), S. Grebenev (IKI-Moscow), V. Beckmann (GSFC-UMBC)
on 2 May 2005; 19:03 UT
Distributed as an Instant Email Notice Transients
Credential Certification: Jamie A. Kennea (kennea@astro.psu.edu)

Subjects: X-ray, Gamma Ray, Transient

Referred to by ATel #: 477, 478, 479, 490, 1140

We report the localization of the Integral-discovered X-ray transient IGR J17098-3626 (ATEL #444). IGR J17098-3626 was observed by Swift on May 1st from 16:23 UTC until 18:19 UTC with an exposure time of 2.8ks. The source was predicted to be bright, so the XRT was put into Photon Counting mode for 500s of the observation in order to obtain a position, with the remainder of the observation taken in Window Timing mode.

We have performed a preliminary analysis of the Swift-XRT data and have found a uncatalogued X-ray source at the following coordinates: RA(J2000): 17:09:45.9 Dec(J2000): -36:27:57. We estimate an uncertainty of about 5 arcseconds radius (90% containment). This position is 30 arcseconds from the INTEGRAL position reported in ATEL #444.

The source is bright, with the Photon Counting mode data showing significant pile-up. We estimate an average source flux from Window Timing data of 1.3 x 10^-9 erg/s/cm^2 (0.5-10 keV) with an absorption of approximately 10^22 cm^-2, which is consistent with Galactic absorption. The source appears to be fading, with the flux dropping by ~8% over the duration of the observation.