TITLE: GCN CIRCULAR NUMBER: 20440 SUBJECT: GRB 170112A: Swift-XRT observations DATE: 17/01/12 14:12:03 GMT FROM: Beatriz Mingo at U of Leicester,XRT A. D'Ai (INAF-IASFPA), A. Melandri (INAF-OAB), P. D'Avanzo (INAF-OAB), D.N. Burrows (PSU), T.G.R. Roegiers (PSU), L.M. McCauley (PSU), S.L. Gibson (U. Leicester), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester) reports on behalf of the Swift-XRT team: We have analysed 5.7 ks of Photon Counting (PC) mode XRT data for the Swift/BAT-detected burst GRB 170112A, collected between T0+73 s and T0+13.3 ks. No X-ray sources have been detected consistent with being within 296 arcsec of the Swift/BAT position. The 3-sigma upper limit in the field ranges from ~0.002 to ~0.003 ct s^-1, corresponding to a 0.3-10 keV observed flux of 7.8e-14 to 1.1e-13 erg cm^-2 s^-1 (assuming a typical GRB spectrum). Six uncatalogued sources were detected too far from the GRB position to be likely afterglow candidates. The results of the XRT-team automatic analysis of the XRT observations, including a position-specific upper limit calculator, are available at http://www.swift.ac.uk/ToO_GRBs/00732188. This circular is an official product of the Swift-XRT team.