{
  "body": "P. D'Avanzo (INAF-OAB), M.G. Bernardini (INAF-OAB), S. Dichiara (PSU),\nJ.A. Kennea (PSU), A. Tohuvavohu (U. Toronto), J.P. Osborne (U.\nLeicester), K.L. Page (U. Leicester), A.P. Beardmore (U. Leicester), E.\nAmbrosi  (INAF-IASFPA)\tand P.A. Evans (U. Leicester) reports on behalf\nof the Swift-XRT team:\n\nSwift-XRT has performed follow-up observations of the\nSVOM/Eclairs-detected X-ray transient GRB 240819A (GCN 37208 Coleiro et\nal.), collecting 2.0 ks of Photon Counting (PC) mode data between\nT0+19.7 ks and T0+26.6 ks. \n\nTwo 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):  311.0531  =  20:44:12.74\n  Dec (J2000.0): +49.6821  =  +49:40:55.5\n  Error: 6.6 arcsec (radius, 90% conf.)\n  Count-rate: (3.4 [+2.0, -1.5])e-3 ct s^-1   \n  Distance: 336 arcsec from SVOM/Eclairs position.\n  Flux: (9.8 [+5.7, -4.2])e-13 erg cm^-2 s^-1 (observed, 0.3-10 keV)\n\nSource 2:\n  RA (J2000.0):  310.9464  =  20:43:47.14\n  Dec (J2000.0): +49.5140  =  +49:30:50.3\n  Error: 5.8 arcsec (radius, 90% conf. [Enhanced position])\n  Count-rate: 0.0111 [+0.0035, -0.0029] ct s^-1   \n  Distance: 636 arcsec from SVOM/Eclairs position.\n  Flux: (4.4 [+1.4, -1.1])e-13 erg cm^-2 s^-1 (observed, 0.3-10 keV)\n\nMoreover Source 2, separated by 5.525\" from EP J204347.6+493054 (GCN\n37206 Li et al.), has not been detected from a previous observation\nperformed by Swift at MJD 54638.495 with a 3 sigma upper limit of\n2.9e-03 ct s^-1.\n\nSwift will perform further ToO observations to assess the nature of \nthis transient.\n\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/00021702.\n\nThis circular is an official product of the Swift-XRT team.\n\n",
  "createdOn": 1724258172607,
  "subject": "GRB 240819A: Swift-XRT observations",
  "bibcode": "2024GCN.37218....1D",
  "eventId": "GRB 240819A",
  "submittedHow": "email",
  "submitter": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
  "circularId": 37218
}