{
  "subject": "GRB 230512A: Swift-XRT observations",
  "submitter": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
  "circularId": 33789,
  "createdOn": 1683965179869,
  "bibcode": "2023GCN.33789....1O",
  "eventId": "GRB 230512A",
  "body": "J.P. Osborne (U. Leicester), A. Melandri (INAF-OAR), T. Sbarrato\n(INAF-OAB), P. D'Avanzo (INAF-OAB), J.A. Kennea (PSU), A. Tohuvavohu\n(U. Toronto), D.N. Burrows (PSU), K.L. Page (U. Leicester), A.P.\nBeardmore (U. Leicester) and P.A. Evans (U. Leicester) report on behalf\nof the Swift-XRT team:\n\nSwift-XRT has performed follow-up observations of the\nFermi/LAT-detected burst GRB 230512A in a series of observations tiled\non the sky. The total exposure time is 4.9 ks, distributed over 4\ntiles; the maximum exposure at a single sky location was 2.3 ks. The\ndata were collected between T0+45.5 ks and T0+57.3 ks, and are entirely\nin Photon Counting (PC) mode. \n\nNine 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):  295.4803  =  19:41:55.26\n  Dec (J2000.0): +38.6649  =  +38:39:53.6\n  Error: 4.2 arcsec (radius, 90% conf. [Enhanced position])\n  Count-rate: (8.8 [+3.9, -3.0])e-3 ct s^-1   \n  Distance: 980 arcsec from Fermi/LAT position.\n  Flux: (5.1 [+2.2, -1.8])e-13 erg cm^-2 s^-1 (observed, 0.3-10 keV)\n\nSource 3:\n  RA (J2000.0):  295.5430  =  19:42:10.33\n  Dec (J2000.0): +38.7526  =  +38:45:09.4\n  Error: 5.5 arcsec (radius, 90% conf. [Enhanced position])\n  Count-rate: 0.0176 [+0.0056, -0.0047] ct s^-1   \n  Distance: 1331 arcsec from Fermi/LAT position.\n  Flux: (3.57 [+1.13, -0.95])e-13 erg cm^-2 s^-1 (observed, 0.3-10 keV)\n\nSource 5:\n  RA (J2000.0):  295.2060  =  19:40:49.43\n  Dec (J2000.0): +38.4686  =  +38:28:07.1\n  Error: 6.2 arcsec (radius, 90% conf.)\n  Count-rate: 0.0105 [+0.0042, -0.0034] ct s^-1   \n  Distance: 600 arcsec from Fermi/LAT position.\n\nSource 6:\n  RA (J2000.0):  295.7616  =  19:43:2.79\n  Dec (J2000.0): +38.3644  =  +38:21:51.9\n  Error: 3.9 arcsec (radius, 90% conf. [Enhanced position])\n  Count-rate: (6.7 [+3.5, -2.6])e-3 ct s^-1   \n  Distance: 1028 arcsec from Fermi/LAT position.\n\nSource 7:\n  RA (J2000.0):  295.0895  =  19:40:21.48\n  Dec (J2000.0): +38.4348  =  +38:26:05.5\n  Error: 6.8 arcsec (radius, 90% conf.)\n  Count-rate: (5.4 [+3.3, -2.4])e-3 ct s^-1   \n  Distance: 884 arcsec from Fermi/LAT position.\n\nSource 8:\n  RA (J2000.0):  295.3130  =  19:41:15.11\n  Dec (J2000.0): +38.4565  =  +38:27:23.3\n  Error: 5.1 arcsec (radius, 90% conf. [Enhanced position])\n  Count-rate: (8.7 [+4.1, -3.2])e-3 ct s^-1   \n  Distance: 318 arcsec from Fermi/LAT position.\n\nSource 9:\n  RA (J2000.0):  295.2484  =  19:40:59.62\n  Dec (J2000.0): +38.1016  =  +38:06:05.7\n  Error: 7.7 arcsec (radius, 90% conf.)\n  Count-rate: (5.5 [+3.1, -2.3])e-3 ct s^-1   \n  Distance: 1156 arcsec from Fermi/LAT position.\n\nSource 10:\n  RA (J2000.0):  295.1589  =  19:40:38.13\n  Dec (J2000.0): +38.4685  =  +38:28:06.6\n  Error: 6.1 arcsec (radius, 90% conf.)\n  Count-rate: (9.8 [+5.8, -4.3])e-3 ct s^-1   \n  Distance: 723 arcsec from Fermi/LAT position.\n\nSource 11:\n  RA (J2000.0):  295.2125  =  19:40:50.99\n  Dec (J2000.0): +38.0868  =  +38:05:12.5\n  Error: 4.5 arcsec (radius, 90% conf. [Enhanced position])\n  Count-rate: (9.5 [+4.1, -3.2])e-3 ct s^-1   \n  Distance: 1245 arcsec from Fermi/LAT position.\n  Flux: (3.3 [+1.4, -1.1])e-13 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_GRB00111.\n\nThis circular is an official product of the Swift-XRT team.\n\n"
}