{
  "eventId": "GRB 250217C",
  "submittedHow": "email",
  "bibcode": "2025GCN.39373....1B",
  "circularId": 39373,
  "body": "A.P. Beardmore (U. Leicester), V. D'Elia (SSDC & INAF-OAR), B.\nSbarufatti (INAF-OAB), C. Salvaggio (INAF-OAB), J.A. Kennea (PSU), D.N.\nBurrows (PSU), M. A. Williams (PSU), J.P. Osborne (U. Leicester) and\nP.A. Evans (U. Leicester) reports on behalf of the Swift-XRT team:\n\nSwift-XRT has performed follow-up observations of the IPN-detected\nburst GRB 250217C in a series of observations tiled on the sky.  The\ntotal exposure time is\t3.5 ks, distributed over 7 tiles; the maximum\nexposure at a single sky location in the tiling was 1.2 ks. The data\nwere collected between T0+69.9 ks and T0+98.0 ks, and are entirely in\nPhoton Counting (PC) mode. \n\nNo uncatalogued X-ray sources have been detected. The 3-sigma upper\nlimit in the field (not including the regions where the tiles overlap)\nranges from ~0.01 to ~0.03 ct s^-1, corresponding to a 0.3-10 keV\nobserved flux of 5.3e-13 to 1.3e-12 erg cm^-2 s^-1 (assuming a typical\nGRB spectrum).\n\nThree previously-catalogued X-ray sources have been detected, however\ntheir status as catalogued objects makes them unlikely to be the\nafterglow.\n\nThe results of the XRT-team automatic analysis of the tiled XRT\nobservations, including a position-specific upper limit calculator, are\navailable at https://www.swift.ac.uk/xrt_products/TILED_GRB00133.\n\nThis circular is an official product of the Swift-XRT team.\n\n",
  "submitter": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
  "createdOn": 1739973086578,
  "subject": "GRB 250217C: Swift-XRT observations"
}