TITLE: GCN CIRCULAR NUMBER: 15388 SUBJECT: Swift Trigger 575905/possible GRB 131026A: Swift-XRT observations DATE: 13/10/26 17:18:25 GMT FROM: Valerio D'Elia at ASDC L. Izzo (URoma/ICRA), V. D'Elia (ASDC), P. D'Avanzo, A. Melandri (INAF-OAB), A. Maselli (INAF-IASFPA) report: We have analysed 8.93 ks of XRT data for Swift Trigger 575905 (Cenko et al. GCN Circ. 15384). Two sources were detected at SNR>4, inside a region of 3 arcmin from the BAT position at the following coordinates: Source 1 - (1RXS J010222.4+323020) RA,Dec = 01h 02m 22.8s, +32° 30' 02.7" Source 2 RA,Dec = 01h 02m 02.6s, +32° 30' 00.9", with an uncertainty of 4.1" and 4.6", respectively. Source 1 matches a catalogued X-ray source (1RXS J010222.4+323020 of the ROSAT/RASSFSC table is 18" away), while source 2 is an uncatalogued source, but below the RASS limit. We can not say at the present time whether source 2 is fading. The count rate at the position of Source 2 is (4.3 +/- 1.0) x 10^-3 cts/s. This corresponds to an observed 0.3-10 keV flux of 1.54 x 10^-13 erg/cm2/s (assuming a typical GRB spectrum with photon spectral index of 2). If we consider the Galactic absorption in this direction (5.1 x 10^20 cm^-2; Kalberla et al. 2005) this corresponds to an unabsorbed flux of 1.78 x 10^-13 erg/cm2/s. The results of the XRT-team automatic analysis are available at: http://www.swift.ac.uk/possible_GRBs/00575905 This circular is an official product of the Swift-XRT team. ---------------------------------------------------------------- This message was sent using IMP, the Internet Messaging Program.