{
  "bibcode": "2022GCN.33072....1P",
  "body": "K.L. Page (U. Leicester), M.G. Bernardini (INAF-OAB), E. Ambrosi \n(INAF-IASFPA) , M. Capalbi (INAF-IASFPA), J. D. Gropp (PSU), S.\nDichiara (PSU), J.A. Kennea (PSU), A.P. Beardmore (U. Leicester) and\nP.A. Evans (U. Leicester) report on behalf of the Swift-XRT team:\n\nSwift-XRT has performed follow-up observations of the\nSwift/BAT-GUANO-detected burst GRB 221215A, collecting 2.8 ks of Photon\nCounting (PC) mode data between T0+97.3 ks and T0+113.8 ks. \n\nNo X-ray sources have been detected consistent with being within 296\narcsec of the Swift/BAT-GUANO position. The 3-sigma upper limit in the\nfield is 0.005 ct  s^-1, corresponding to a 0.3-10 keV observed flux of\n1.9e-13 erg cm^-2 s^-1 (assuming a typical GRB spectrum).\n\nAn uncatalogued was detected, however this was too far from the GRB\nposition to be the afterglow.\n\nThe results of the XRT-team automatic analysis of the XRT observations,\nincluding a position-specific upper limit calculator, are available at\nhttps://www.swift.ac.uk/ToO_GRBs/00021533.\n\nThis circular is an official product of the Swift-XRT team.",
  "circularId": 33072,
  "createdOn": 1671205294000,
  "email": "pae9@leicester.ac.uk",
  "subject": "GRB 221215A: Swift-XRT observations",
  "submitter": "Phil Evans at U of Leicester  <pae9@leicester.ac.uk>",
  "eventId": "GRB 221215A"
}