{
  "submitter": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
  "subject": "GRB 250821A: Prompt enhanced Swift-XRT position",
  "circularId": 41463,
  "submittedHow": "email",
  "createdOn": 1755777430988,
  "bibcode": "2025GCN.41463....1E",
  "body": "P.A. Evans (U. Leicester) reports on behalf of the Swift-XRT team:\n\nUsing 1.6 ks of promptly downlinked XRT event data for GRB 250821A, we\nfind an enhanced XRT position of the afterglow: RA, Dec: 358.44056,\n-28.65369 which is equivalent to:\n   RA (J2000)  = 23 53 45.73\n   Dec (J2000) = -28 39 13.3\nwith an uncertainty of 2.9 arcseconds (radius, 90% confidence).\nAnalysis of the promptly available data is online at\nhttp://www.swift.ac.uk/sper/1344131.\n\nPosition enhancement is described by Goad et al. (2007, A&A, 476, 1401)\nand Evans et al. (2009, MNRAS, 397, 1177).\n\nThis circular is an official product of the Swift-XRT team.\n\n",
  "eventId": "GRB 250821A"
}