TITLE: GCN CIRCULAR NUMBER: 9986 SUBJECT: GRB 091003: Swift XRT analysis DATE: 09/10/04 00:44:01 GMT FROM: Rhaana Starling at U of Leicester R.L.C. Starling and A.P. Beardmore (U. Leicester) report on behalf of the Swift-XRT team: The Swift X-ray Telescope (XRT) observed the Fermi GBM/LAT and Integral-detected GRB 091003 (Rau GCN Circ. 9983; McEnery et al. GCN Circ. 9985) on 2009 October 3 at 20:07:28 UT, 15.5 hours after the Fermi trigger. In 2.5 ks of photon counting mode data we detect an uncatalogued X-ray source at RA, Dec = 251.52047, 36.62548 degrees, which is equivalent to: RA (J2000) = 16:46:04.9 Dec (J2000) = +36:37:31.74 with an uncertainty of 3.7 arcsec (radius, 90% containment). This is 6.85 arcmin from the Fermi LAT position and within its error circle. A spectrum formed from these data can be fit with an absorbed power law of photon index 1.7+/-0.3, with nH < 2e21 cm-2, and has an observed 0.3-10 keV count rate of 0.087+/-0.007 count/s corresponding to a flux of 3.6e-12 erg/cm2/s. At this stage we do not have enough data to tell if the source is fading. This circular is an official product of the Swift-XRT team.