TITLE: GCN CIRCULAR NUMBER: 18589 SUBJECT: GRB 151112A: Swift-XRT observations DATE: 15/11/12 15:25:07 GMT FROM: Phil Evans at U of Leicester D.N. Burrows (PSU), J.A. Kennea (PSU), M. Perri (ASDC), G. Tagliaferri (INAF-OAB), P.A. Evans (U. Leicester) and J.P. Osborne (U. Leicester) report on behalf of the Swift-XRT team: The XRT began observing the field of GRB 151112A at 14:37:09.1 UT, 3141.0 seconds after the BAT trigger. Using promptly downlinked data we find an uncatalogued X-ray source located at RA, Dec 2.05651, -61.66273 which is equivalent to: RA(J2000) = 00h 08m 13.56s Dec(J2000) = -61d 39' 45.8" with an uncertainty of 3.6 arcseconds (radius, 90% containment). This location is 107 arcseconds from the BAT onboard position, within the BAT error circle. This position may be improved as more data are received; the latest position is available at http://www.swift.ac.uk/sper. A power-law fit to a spectrum formed from promptly downlinked event data gives a column density in excess of the Galactic value (1.92 x 10^20 cm^-2, Willingale et al. 2013), with an excess column of 3 (+2.37/-2.09) x 10^21 cm^-2 (90% confidence).