TITLE: GCN CIRCULAR NUMBER: 31064 SUBJECT: GRB 211107B: Swift-XRT observations DATE: 21/11/09 16:34:27 GMT FROM: Phil Evans at U of Leicester <pae9@leicester.ac.uk> A. D'Ai (INAF-IASFPA), D.N. Burrows (PSU), J. D. Gropp (PSU), J.A. Kennea (PSU), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), A. Melandri (INAF-OAB), T. Sbarrato (INAF-OAB) 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 211107B (Swift/BAT did not successfully trigger on GRB 211107B et al. GCN Circ. 31057), collecting 1.7 ks of Photon Counting (PC) mode data between T0+124.3 ks and T0+131.0 ks. One uncatalogued X-ray source has been detected consistent with being within 197 arcsec of the Swift/BAT position, it is below the RASS limit and shows no definitive signs of fading. Therefore, at the present time we cannot confirm this as the afterglow. Details of this source are given below: Source 1: RA (J2000.0): 65.80807 = 04:23:13.94 Dec (J2000.0): -27.56097 = -27:33:39.5 Error: 2.9 arcsec (radius, 90% conf. [Enhanced position]) Count-rate: 0.0220 +/- 0.0042 ct s^-1 Distance: 52 arcsec from Swift/BAT position. Flux: (5.15 +/- 0.98)e-13 erg cm^-2 s^-1 (observed, 0.3-10 keV) The results of the XRT-team automatic analysis of the XRT observations, including a position-specific upper limit calculator, are available at https://www.swift.ac.uk/ToO_GRBs/00021467. This circular is an official product of the Swift-XRT team.