TITLE: GCN CIRCULAR NUMBER: 22009 SUBJECT: GRB 171010B: Swift-XRT observations DATE: 17/10/13 12:18:33 GMT FROM: Boris Sbarufatti at PSU B. Sbarufatti (PSU), J. D. Gropp (PSU), A. Tohuvavohu (PSU), S. J. LaPorte (PSU), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), A.P. Beardmore (U. Leicester), P. D'Avanzo (INAF-OAB), V. D'Elia (ASDC) and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team: Swift-XRT has performed follow-up observations of the Swift/BAT-detected burst GRB 171010B (Palmer et al. GCN Circ. 21995), collecting 4.8 ks of Photon Counting (PC) mode data between T0+91.1 ks and T0+120.1 ks. One uncatalogued X-ray source has been detected consistent with being within 96 arcsec of the Swift/BAT position, however it is not above the RASS limit and does not show definitive signs of fading. Therefore, at the present time we cannot confirm if it is the afterglow. Details of the source are given below: Source 2: RA (J2000.0): 34.1342 = 02:16:32.20 Dec (J2000.0): -54.3915 = -54:23:29.2 Error: 5.6 arcsec (radius, 90% conf.) Count-rate: (6.9 [+1.5, -1.4])e-3 ct s^-1 Distance: 71 arcsec from Swift/BAT position. Flux: (3.35 [+0.74, -0.68])e-13 erg cm^-2 s^-1 (observed, 0.3-10 keV) Six uncatalogued sources were also 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/00020780. This circular is an official product of the Swift-XRT team.