{
  "subject": "GRB 230509B: Tiled Swift observations",
  "body": "\nP. A. Evans (U. Leicester) reports on behalf of the Swift team:\n\nSwift has initiated a series of observations, tiled on the sky, of the\nlocation of the Fermi/GBM GRB 250309B and IceCube-250309A. Automated analysis of\nthe XRT data will be presented online at\nhttp://www.swift.ac.uk/xrt_products/TILED_GRB00134\n\nAny uncatalogued X-ray sources detected in this analysis will be\nreported on this website and via GCN COUNTERPART notices. The probability of finding\nserendipitous sources, unrelated to the Fermi/GBM event is high: any X-ray source\nconsidered to be a probable afterglow candidate will be reported via a GCN Circular\nafter manual consideration.\n\nDetails of the XRT automated analysis methods are detailed in Evans et\nal. (2007, A&A, 469, 379; 2009, MNRAS, 397, 1177 and 2014, ApJS, 210, 8).\n\nThis circular is an official product of the Swift-XRT team.\n\n",
  "eventId": "GRB 230509B",
  "createdOn": 1741526121333,
  "format": "text/plain",
  "editedBy": "Judith Racusin at NASA/GSFC <judith.racusin@nasa.gov> on behalf of P.A. Evans at U. Leicester <pae9@leicester.ac.uk>",
  "version": 2,
  "submittedHow": "email",
  "circularId": 39633,
  "bibcode": "2025GCN.39633....1E",
  "submitter": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
  "editedOn": 1741548687418
}