{
  "bibcode": "2025GCN.40410....1E",
  "createdOn": 1746833572112,
  "eventId": "GRB 250509A",
  "circularId": 40410,
  "submitter": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
  "submittedHow": "email",
  "body": "P.A. Evans (U. Leicester) reports on behalf of the Swift-XRT team:\n\nUsing 426 s of promptly downlinked XRT event data for GRB 250509A, we\nfind an enhanced XRT position of the afterglow: RA, Dec: 46.44960,\n-38.84128 which is equivalent to:\n   RA (J2000)  = 03 05 47.90\n   Dec (J2000) = -38 50 28.6\nwith an uncertainty of 1.9 arcseconds (radius, 90% confidence).\nAnalysis of the promptly available data is online at\nhttp://www.swift.ac.uk/sper/1311764.\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",
  "subject": "GRB 250509A: Prompt enhanced Swift-XRT position"
}