{
  "submitter": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
  "eventId": "GRB 251215A",
  "body": "J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), A.P. Beardmore\n(U. Leicester), A. D'Ai (INAF-IASFPA), S. Campana (INAF-OAB), A.\nMelandri (INAF-OAR), S. Lanava (PSU), S. Dichiara (PSU), J.A. Kennea\n(PSU) and P.A. Evans (U. Leicester) reports on behalf of the Swift-XRT\nteam:\n\nSwift-XRT has performed follow-up observations of the\nSwift/BAT-detected burst GRB 251215A, collecting  5.2 ks of Photon\nCounting (PC) mode data between T0+32.0 ks and T0+49.6 ks. \n\nFour uncatalogued X-ray sources have been detected within the estimated\n3-sigma Swift/BAT error region (493 arcsec), however none of them is\nabove historical upper limits, or shows definitive signs of fading.\nTherefore, at the present time we cannot identify which, if any, is the\nafterglow. Details of these sources are given below:\n\nSource 2:\n  RA (J2000.0):  122.5523  =  08h 10m 12.54s\n  Dec (J2000.0): -36.6697  =  -36d 40' 10.8\"\n  Error: 3.9 arcsec (radius, 90% conf. [Enhanced position])\n  Count-rate: (9.7 [+1.8, -1.7])e-3 ct s^-1   \n  Distance: 383 arcsec from Swift/BAT position.\n  Flux: (4.47 [+0.81, -0.77])e-13 erg cm^-2 s^-1 (observed, 0.3-10 keV)\n\nSource 5:\n  RA (J2000.0):  122.6189  =  08h 10m 28.54s\n  Dec (J2000.0): -36.7427  =  -36d 44' 33.6\"\n  Error: 5.7 arcsec (radius, 90% conf. [Enhanced position])\n  Count-rate: (5.0 [+1.3, -1.2])e-3 ct s^-1   \n  Distance: 97 arcsec from Swift/BAT position.\n  Flux: (1.96 [+0.50, -0.47])e-13 erg cm^-2 s^-1 (observed, 0.3-10 keV)\n\nSource 6:\n  RA (J2000.0):  122.6954  =  08h 10m 46.90s\n  Dec (J2000.0): -36.6198  =  -36d 37' 11.5\"\n  Error: 7.1 arcsec (radius, 90% conf. [Enhanced position])\n  Count-rate: (3.44 [+1.20, -0.99])e-3 ct s^-1\t \n  Distance: 448 arcsec from Swift/BAT position.\n  Flux: (2.87 [+1.00, -0.83])e-13 erg cm^-2 s^-1 (observed, 0.3-10 keV)\n\nSource 8:\n  RA (J2000.0):  122.6662  =  08h 10m 39.88s\n  Dec (J2000.0): -36.6483  =  -36d 38' 53.8\"\n  Error: 5.9 arcsec (radius, 90% conf.)\n  Count-rate: (1.81 [+0.92, -0.72])e-3 ct s^-1\t \n  Distance: 330 arcsec from Swift/BAT position.\n  Flux: (3.7 [+1.9, -1.5])e-10 erg cm^-2 s^-1 (observed, 0.3-10 keV)\n\nA catalogued source was also detected within the estimated 3-sigma\nSwift/BAT error region (493 arcsec).\n\nTwo uncatalogued sources were also detected too far from the GRB\nposition to be likely afterglow candidates.\n\nThe results of the XRT-team automatic analysis of the XRT observations,\nincluding a position-specific upper limit calculator, are available at\nhttps://www.swift.ac.uk/ToO_GRBs/00021894.\n\nThis circular is an official product of the Swift-XRT team.\n\n",
  "circularId": 43137,
  "bibcode": "2025GCN.43137....1O",
  "subject": "GRB 251215A: Swift-XRT observations",
  "submittedHow": "email",
  "createdOn": 1765872393705
}