{
  "bibcode": "2019GCN.25399....1D",
  "body": "A. D'Ai (INAF-IASFPA), D.N. Burrows (PSU), J. D. Gropp (PSU), A.\nTohuvavohu (PSU), J.P. Osborne (U. Leicester), K.L. Page (U.\nLeicester), A. Melandri (INAF-OAB), P. D'Avanzo (INAF-OAB) and K. L.\nPage (U Leicester) report on behalf of the Swift-XRT team:\n\nWe have analysed 3.8 ks of Photon Counting (PC) mode XRT data for the\nSwift/BAT-detected burst GRB 190816A (Page et al. GCN Circ. 25368),\ncollected between T0+141.7 ks and T0+216.6 ks. \n\nOne uncatalogued X-ray source has been detected consistent with being\nwithin 296 arcsec of the Swift/BAT position, it is below the RASS limit\nand shows no definitive signs of fading. Therefore, at the present time\nwe cannot confirm this as the afterglow. Details of this source are\ngiven below:\n\nSource 4:\n  RA (J2000.0):  341.1897  =  22:44:45.53\n  Dec (J2000.0): -29.7577  =  -29:45:27.8\n  Error: 4.8 arcsec (radius, 90% conf. [Enhanced position])\n  Count-rate: (8.1 [+1.8, -1.7])e-3 ct s^-1   \n  Distance: 64 arcsec from Swift/BAT position.\n  Flux: (2.67 [+0.60, -0.56])e-13 erg cm^-2 s^-1 (observed, 0.3-10 keV)\n\nThree uncatalogued sources were also detected too far from the GRB\nposition to be likely afterglow candidates.\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/00920783.\n\nThis circular is an official product of the Swift-XRT team.",
  "circularId": 25399,
  "createdOn": 1566202493000,
  "email": "klp5@leicester.ac.uk",
  "subject": "GRB 190816A: Swift-XRT observations",
  "submitter": "Kim Page at U.of Leicester  <klp5@leicester.ac.uk>",
  "eventId": "GRB 190816A"
}