{
  "createdOn": 1763575588705,
  "subject": "GRB 251117A: Swift-XRT observations",
  "submitter": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
  "submittedHow": "email",
  "body": "J.A. Kennea (PSU), A.P. Beardmore (U. Leicester), J.P. Osborne (U.\nLeicester), P. D'Avanzo (INAF-OAB), M.G. Bernardini (INAF-OAB), E.\nAmbrosi  (INAF-IASFPA) , D.N. Burrows (PSU), S. Lanava (PSU) and P.A.\nEvans (U. Leicester) reports on behalf of the Swift-XRT team:\n\nSwift-XRT has performed follow-up observations of the\nFermi/GBM-detected burst GRB 251117A in a series of observations tiled\non the sky.  The total exposure time is  6.5 ks, distributed over 7\ntiles; the maximum exposure at a single sky location in the tiling was\n2.0 ks. The data were collected between T0+48.9 ks and T0+81.8 ks, and\nare entirely in Photon Counting (PC) mode. \n\nThirteen 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 1:\n  RA (J2000.0):  331.2065  =  22h 04m 49.57s\n  Dec (J2000.0): +5.5085  =  +05d 30' 30.6\"\n  Error: 8.0 arcsec (radius, 90% conf.)\n  Count-rate: (7.5 [+4.2, -3.1])e-3 ct s^-1   \n  Distance: 401 arcsec from Fermi/GBM position.\n  Flux: (2.8 [+1.5, -1.1])e-13 erg cm^-2 s^-1 (observed, 0.3-10 keV)\n\nSource 2:\n  RA (J2000.0):  331.2121  =  22h 04m 50.90s\n  Dec (J2000.0): +5.6862  =  +05d 41' 10.4\"\n  Error: 18.7 arcsec (radius, 90% conf.)\n  Count-rate: (4.4 [+2.7, -1.9])e-3 ct s^-1   \n  Distance: 523 arcsec from Fermi/GBM position.\n\nSource 3:\n  RA (J2000.0):  331.1150  =  22h 04m 27.61s\n  Dec (J2000.0): +5.1842  =  +05d 11' 03.0\"\n  Error: 8.5 arcsec (radius, 90% conf.)\n  Count-rate: (7.0 [+4.5, -3.2])e-3 ct s^-1   \n  Distance: 1539 arcsec from Fermi/GBM position.\n\nSource 6:\n  RA (J2000.0):  331.1130  =  22h 04m 27.12s\n  Dec (J2000.0): +5.7560  =  +05d 45' 21.6\"\n  Error: 7.8 arcsec (radius, 90% conf.)\n  Count-rate: (8.2 [+4.5, -3.4])e-3 ct s^-1   \n  Distance: 947 arcsec from Fermi/GBM position.\n  Flux: (2.8 [+1.5, -1.2])e-13 erg cm^-2 s^-1 (observed, 0.3-10 keV)\n\nSource 7:\n  RA (J2000.0):  331.5308  =  22h 06m 07.38s\n  Dec (J2000.0): +5.4134  =  +05d 24' 48.2\"\n  Error: 6.5 arcsec (radius, 90% conf.)\n  Count-rate: (4.9 [+2.6, -1.9])e-3 ct s^-1   \n  Distance: 1000 arcsec from Fermi/GBM position.\n\nSource 8:\n  RA (J2000.0):  331.7897  =  22h 07m 09.54s\n  Dec (J2000.0): +5.6746  =  +05d 40' 28.6\"\n  Error: 7.8 arcsec (radius, 90% conf.)\n  Count-rate: (7.1 [+4.4, -3.1])e-3 ct s^-1   \n  Distance: 1794 arcsec from Fermi/GBM position.\n\nSource 9:\n  RA (J2000.0):  330.9021  =  22h 03m 36.49s\n  Dec (J2000.0): +5.4483  =  +05d 26' 54.0\"\n  Error: 8.3 arcsec (radius, 90% conf.)\n  Count-rate: (7.3 [+4.4, -3.3])e-3 ct s^-1   \n  Distance: 1491 arcsec from Fermi/GBM position.\n  Flux: (3.5 [+2.1, -1.6])e-13 erg cm^-2 s^-1 (observed, 0.3-10 keV)\n\nSource 10:\n  RA (J2000.0):  331.7481  =  22h 06m 59.54s\n  Dec (J2000.0): +5.3975  =  +05d 23' 51.1\"\n  Error: 8.5 arcsec (radius, 90% conf.)\n  Count-rate: 0.0109 [+0.0053, -0.0040] ct s^-1   \n  Distance: 1721 arcsec from Fermi/GBM position.\n\nSource 11:\n  RA (J2000.0):  330.8986  =  22h 03m 35.66s\n  Dec (J2000.0): +5.4101  =  +05d 24' 36.5\"\n  Error: 8.6 arcsec (radius, 90% conf.)\n  Count-rate: (8.4 [+4.7, -3.5])e-3 ct s^-1   \n  Distance: 1549 arcsec from Fermi/GBM position.\n\nSource 12:\n  RA (J2000.0):  330.9379  =  22h 03m 45.11s\n  Dec (J2000.0): +5.3847  =  +05d 23' 05.0\"\n  Error: 7.1 arcsec (radius, 90% conf.)\n  Count-rate: (9.1 [+4.8, -3.5])e-3 ct s^-1   \n  Distance: 1458 arcsec from Fermi/GBM position.\n\nSource 13:\n  RA (J2000.0):  330.8498  =  22h 03m 23.95s\n  Dec (J2000.0): +5.4122  =  +05d 24' 44.0\"\n  Error: 9.1 arcsec (radius, 90% conf.)\n  Count-rate: (5.8 [+4.2, -2.8])e-3 ct s^-1   \n  Distance: 1710 arcsec from Fermi/GBM position.\n\nSource 14:\n  RA (J2000.0):  330.7987  =  22h 03m 11.70s\n  Dec (J2000.0): +5.6452  =  +05d 38' 42.7\"\n  Error: 9.8 arcsec (radius, 90% conf.)\n  Count-rate: (6.7 [+4.2, -3.0])e-3 ct s^-1   \n  Distance: 1816 arcsec from Fermi/GBM position.\n\nSource 15:\n  RA (J2000.0):  330.9250  =  22h 03m 42.01s\n  Dec (J2000.0): +5.4456  =  +05d 26' 44.0\"\n  Error: 32.4 arcsec (radius, 90% conf.)\n  Count-rate: (5.7 [+4.1, -3.1])e-3 ct s^-1   \n  Distance: 1416 arcsec from Fermi/GBM position.\n  Flux: (1.79 [+1.29, -0.96])e-12 erg cm^-2 s^-1 (observed, 0.3-10 keV)\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_GRB00141.\n\nThis circular is an official product of the Swift-XRT team.\n\n",
  "eventId": "GRB 251117A",
  "bibcode": "2025GCN.42768....1K",
  "circularId": 42768
}