TITLE: GCN CIRCULAR NUMBER: 13569 SUBJECT: GRB 120803A: Swift-XRT Observations DATE: 12/08/03 14:11:31 GMT FROM: Phil Evans at U of Leicester P.A. Evans, K.L. Page (U. Leicester) and J.L. Racusin (NASA/GSFC) report on behalf of the Swift-XRT team: We have analysed 2.5 ks of Photon Counting mode XRT data on GRB 120803A from 155 s to 5.8 ks after the BAT trigger (Racusin et al., GCN Circ 13565). We find a single, uncatalogued X-ray source at RA,Dec = 269.5140, -6.7628 which is equivalent to: RA(J2000) = 17h 58m 03.36s Dec(J2000) = -06d 45' 46.2" with an uncertainty of 4 arc sec (radius, 90% containment). This source is 4.2 arcmin from the original BAT position (GCN Circ 13565) but only 2 arcmin from the refined BAT position (Ukwatta et al., GCN Circ 13568), inside the refined BAT error circle. The spectrum of this object can be modelled by an absorbed power-law with a photon index of 1.1 (+0.9, -0.5). The absorption is consistent with the Galactic value of 2.3e21 cm^-2 (Kalberla et al. 2005). The source has a mean count-rate of 0.014 (+/- 0.0029) ct/sec, we cannot tell at this time whether the source is fading. Further observations are planned. This circular is an official product of the Swift-XRT team.