{
  "subject": "GRB 240513A: Swift-XRT observations",
  "body": "M. Ferro (INAF-OAB), R. Brivio (INAF-OAB), A. Tohuvavohu (U. Toronto),\nD.N. Burrows (PSU), J. D. Gropp (PSU), A.P. Beardmore (U. Leicester),\nJ.P. Osborne (U. Leicester), A. D'Ai (INAF-IASFPA) and P.A. Evans (U.\nLeicester) reports on behalf of the Swift-XRT team:\n\nSwift-XRT has performed follow-up observations of the\nFermi/LAT-detected burst GRB 240513A in a series of observations tiled\non the sky. The total exposure time is 5.1 ks, distributed over 7\ntiles; the maximum exposure at a single sky location was 1.6 ks. The\ndata were collected between T0+46.1 ks and T0+80.7 ks, and are entirely\nin Photon Counting (PC) mode. \n\nThree uncatalogued X-ray sources have been detected, however none of\nthem is above the RASS limit 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):  163.8237  =  10:55:17.69\n  Dec (J2000.0): -27.6225  =  -27:37:20.9\n  Error: 9.7 arcsec (radius, 90% conf.)\n  Count-rate: (8.6 [+4.8, -3.5])e-3 ct s^-1   \n  Distance: 1422 arcsec from Fermi/LAT position.\n\nSource 4:\n  RA (J2000.0):  163.9338  =  10:55:44.10\n  Dec (J2000.0): -27.5934  =  -27:35:36.2\n  Error: 7.6 arcsec (radius, 90% conf.)\n  Count-rate: (7.4 [+4.8, -3.4])e-3 ct s^-1   \n  Distance: 1736 arcsec from Fermi/LAT position.\n\nSource 6:\n  RA (J2000.0):  163.4544  =  10:53:49.05\n  Dec (J2000.0): -27.4116  =  -27:24:41.7\n  Error: 5.1 arcsec (radius, 90% conf.)\n  Count-rate: 0.0224 [+0.0072, -0.0060] ct s^-1   \n  Distance: 362 arcsec from Fermi/LAT position.\n  Flux: (1.64 [+0.53, -0.44])e-12 erg cm^-2 s^-1 (observed, 0.3-10 keV)\n\nTwo catalogued sources were also detected.\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_GRB00125.\n\nThis circular is an official product of the Swift-XRT team.\n\n",
  "circularId": 36478,
  "bibcode": "2024GCN.36478....1F",
  "createdOn": 1715697311386,
  "submitter": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
  "eventId": "GRB 240513A",
  "submittedHow": "email"
}