TITLE: GCN CIRCULAR NUMBER: 31068 SUBJECT: GRB 211106A: Swift-XRT afterglow detection DATE: 21/11/09 19:35:25 GMT FROM: Phil Evans at U of Leicester <pae9@leicester.ac.uk> V. D'Elia (SSDC & INAF-OAR), A. D'Ai (INAF-IASFPA), B. Sbarufatti (PSU), D.N. Burrows (PSU), J. D. Gropp (PSU), A.P. Beardmore (U. Leicester), J.P. Osborne (U. Leicester), A. Melandri (INAF-OAB) and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team: Swift-XRT has conducted further observations of the field of the Swift/BAT-GUANO-detected burst GRB 211106A (Ridnaia et al. GCN Circ. 31054). The observations now extend from T0+39.3 ks to T0+290.7 ks. Of the sources reported by D'Elia et al. (GCN Circ. 31051), "Source 2" is fading with 2.5 sigma significance and thus is believed to be the GRB afterglow. Using 2766 s of PC mode data and 2 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 = 343.58521, -53.23028 which is equivalent to: RA (J2000): 22h 54m 20.45s Dec(J2000): -53d 13' 49.0" with an uncertainty of 3.4 arcsec (radius, 90% confidence). This position is 2.1 arcmin from the Swift/BAT-GUANO position. The light curve can be modelled with a power-law decay with a decay index of alpha=0.7 (+0.5, -0.4). The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00021466. The results of the full analysis of the XRT observations are available at https://www.swift.ac.uk/ToO_GRBs/00021466. This circular is an official product of the Swift-XRT team.