{
  "bibcode": "2021GCN.30547....1E",
  "body": "P.A. Evans (U. Leicester) and P. D'Avanzo (INAF-OAB) report on behalf of \nthe Swift-XRT team.\n\nThe XRT position of GRB 210724A reported in GCN Circ. 30515 was 11\" from \nthe position of the optical candidate found by de Ugarte Postigo et al. \n(GCN Circ. 30511). Unusually, this position underwent significant \nvariation during the normal revisions after each data downlink. \nInvestigation has revealed a rare local minimum issue during the first \nXRT image, which has now been fixed.\n\nThe best XRT position is RA, Dec = 227.41461, -6.29070 which is \nequivalent to:\n\nRA (J2000): 15h 09m 39.51s\nDec(J2000): -06d 17' 26.5\"\n\nwith an uncertainty of 3.0 arcsec (radius, 90% confidence). This \nposition is 1.1\" from the optical position of de Ugarte Postigo et al.\n\nWe apologise for the confusion caused by this rare glitch, which \ncoincided with the author's vacation (Murphy et al).\n\nAs ever, the most recent version of the position can be found online at:\nhttps://www.swift.ac.uk/xrt_positions/01061482/\n\n\nThis circular is an official product of the Swift-XRT team.",
  "circularId": 30547,
  "createdOn": 1627572348000,
  "email": "pae9@leicester.ac.uk",
  "subject": "GRB 210724A: Corrected Swift-XRT enhanced position",
  "submitter": "Phil Evans at U of Leicester  <pae9@leicester.ac.uk>",
  "eventId": "GRB 210724A"
}