TITLE: GCN CIRCULAR NUMBER: 15424 SUBJECT: GRB 131031A: Swift-XRT observations DATE: 13/11/01 06:36:03 GMT FROM: Kim Page at U.of Leicester B.P. Gompertz and K.L. Page (U. Leicester) report on behalf of the Swift-XRT team: We have analysed 3.7 ks of XRT data for the Swift/BAT-detected burst: GRB 131031A, from 39.7 ks to 52.0 ks after the Swift/BAT trigger. The data are entirely in Photon Counting (PC) mode. An X-ray source is detected within the Swift/BAT error circle. Using 1649 s of PC mode data and 1 UVOT images, we find an enhanced XRT position (using the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue): RA, Dec = 29.61022, -1.57882 which is equivalent to: RA (J2000): 01h 58m 26.45s Dec(J2000): -01d 34' 43.7" with an uncertainty of 4.7 arcsec (radius, 90% confidence). This position is 91 arcsec from the Swift/BAT position. The source has a mean count rate of 8.8e-03 ct/sec; we cannot determine at the present time whether it is fading. The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00020317. This circular is an official product of the Swift-XRT team.