{
  "bibcode": "2021GCN.31068....1D",
  "body": "V. D'Elia (SSDC & INAF-OAR), A. D'Ai (INAF-IASFPA), B. Sbarufatti\n(PSU), D.N. Burrows (PSU), J. D. Gropp (PSU), A.P. Beardmore (U.\nLeicester), J.P. Osborne (U. Leicester), A. Melandri (INAF-OAB) and\nP.A. Evans (U. Leicester) report on behalf of the Swift-XRT team:\n\nSwift-XRT has conducted further observations of the field of the\nSwift/BAT-GUANO-detected burst GRB 211106A (Ridnaia et al. GCN Circ.\n31054). The observations now extend from T0+39.3 ks to T0+290.7 ks. \n\nOf the sources reported by D'Elia et al. (GCN Circ. 31051), \"Source 2\"\nis fading with 2.5 sigma significance and thus is believed to be the\nGRB afterglow. Using 2766 s of PC mode data and 2 UVOT images, we find\nan enhanced XRT position (using the XRT-UVOT alignment and matching\nUVOT field sources to the USNO-B1 catalogue): RA, Dec = 343.58521,\n-53.23028 which is equivalent to:\n\nRA (J2000): 22h 54m 20.45s\nDec(J2000): -53d 13' 49.0\"\n\nwith an uncertainty of 3.4 arcsec (radius, 90% confidence). This\nposition is 2.1 arcmin from the Swift/BAT-GUANO position. \n\nThe light curve can be modelled with a power-law decay with a decay\nindex of alpha=0.7 (+0.5, -0.4).\n\nThe results of the XRT-team automatic analysis are available at\nhttp://www.swift.ac.uk/xrt_products/00021466.\nThe results of the full analysis of the XRT observations are available\nat https://www.swift.ac.uk/ToO_GRBs/00021466.\n\nThis circular is an official product of the Swift-XRT team.",
  "circularId": 31068,
  "createdOn": 1636486525000,
  "email": "pae9@leicester.ac.uk",
  "subject": "GRB 211106A: Swift-XRT afterglow detection",
  "submitter": "Phil Evans at U of Leicester  <pae9@leicester.ac.uk>",
  "eventId": "GRB 211106A"
}