{
  "circularId": 37421,
  "createdOn": 1725721326150,
  "bibcode": "2024GCN.37421....1B",
  "subject": "GRB 240905B: Swift-XRT observations",
  "eventId": "GRB 240905B",
  "submitter": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
  "body": "R. Brivio (INAF-OAB), A. D'Ai (INAF-IASFPA), S. Dichiara (PSU), J.A.\nKennea (PSU), D.N. Burrows (PSU), K.L. Page (U. Leicester), A.P.\nBeardmore (U. Leicester), A. Melandri (INAF-OAR) 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 240905B, collecting 4.7 ks of Photon\nCounting (PC) mode data between T0+165.8 ks and T0+184.5 ks. \n\nSix uncatalogued X-ray sources have been detected, however none of them\nis above the RASS limit or shows definitive signs of fading. Therefore,\nat the present time we cannot identify which, if any, is the afterglow.\nDetails of these sources are given below:\n\nSource 1:\n  RA (J2000.0):  267.9656  =  17:51:51.73\n  Dec (J2000.0): +14.3317  =  +14:19:54.0\n  Error: 5.3 arcsec (radius, 90% conf.)\n  Count-rate: (7.5 [+1.7, -1.6])e-3 ct s^-1   \n  Distance: 489 arcsec from Fermi/LAT position.\n  Flux: (1.21 [+0.28, -0.26])e-13 erg cm^-2 s^-1 (observed, 0.3-10 keV)\n\nSource 2:\n  RA (J2000.0):  267.8714  =  17:51:29.15\n  Dec (J2000.0): +14.1724  =  +14:10:20.6\n  Error: 6.1 arcsec (radius, 90% conf.)\n  Count-rate: (2.45 [+1.16, -0.91])e-3 ct s^-1\t \n  Distance: 459 arcsec from Fermi/LAT position.\n\nSource 3:\n  RA (J2000.0):  268.0531  =  17:52:12.75\n  Dec (J2000.0): +14.1172  =  +14:07:01.9\n  Error: 6.3 arcsec (radius, 90% conf.)\n  Count-rate: (1.14 [+0.99, -0.76])e-3 ct s^-1\t \n  Distance: 351 arcsec from Fermi/LAT position.\n\nSource 4:\n  RA (J2000.0):  268.1019  =  17:52:24.47\n  Dec (J2000.0): +14.0362  =  +14:02:10.2\n  Error: 6.5 arcsec (radius, 90% conf.)\n  Count-rate: (4.5 [+1.5, -1.3])e-3 ct s^-1   \n  Distance: 688 arcsec from Fermi/LAT position.\n  Flux: (1.10 [+0.38, -0.31])e-13 erg cm^-2 s^-1 (observed, 0.3-10 keV)\n\nSource 5:\n  RA (J2000.0):  268.0524  =  17:52:12.56\n  Dec (J2000.0): +14.2532  =  +14:15:11.5\n  Error: 5.9 arcsec (radius, 90% conf.)\n  Count-rate: (1.11 [+0.86, -0.69])e-3 ct s^-1\t \n  Distance: 264 arcsec from Fermi/LAT position.\n\nSource 6:\n  RA (J2000.0):  267.9614  =  17:51:50.74\n  Dec (J2000.0): +14.2308  =  +14:13:51.0\n  Error: 7.4 arcsec (radius, 90% conf.)\n  Count-rate: (1.41 [+0.93, -0.75])e-3 ct s^-1\t \n  Distance: 174 arcsec from Fermi/LAT position.\n  Flux: (3.8 [+2.5, -2.0])e-14 erg cm^-2 s^-1 (observed, 0.3-10 keV)\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/00021711.\n\nThis circular is an official product of the Swift-XRT team.\n\n",
  "submittedHow": "email"
}