{
  "bibcode": "2017GCN.21086....1M",
  "body": "A. Melandri (INAF-OAB), B. Sbarufatti (INAF-OAB/PSU), D.N. Burrows\n(PSU), A. Cholden-Brown (PSU), S.L. Gibson (U. Leicester), J.P. Osborne\n(U. Leicester), P. D'Avanzo (INAF-OAB), V. D'Elia (ASDC) and P.A. Evans\n(U. Leicester) report on behalf of the Swift-XRT team:\n\nSwift-XRT has performed follow-up observations of the\nFermi/LAT-detected burst GRB 170510A (Bissaldi et al. GCN Circ. 21080)\nin a series of observations tiled on the sky. The total exposure time\nis 4.7 ks, distributed over 7 tiles; the maximum exposure at a single\nsky location was 1.4 ks. The data were collected between T0+24.3 ks and\nT0+36.2 ks, and are entirely in Photon Counting (PC) mode. \n\nOne uncatalogued X-ray source has been detected, it is below the RASS\nlimit and shows no definitive signs of fading. Therefore, at the\npresent time we cannot confirm this as the afterglow. Details of this\nsource are given below:\n\nSource 1:\n  RA (J2000.0):  160.15394  =  10:40:36.95\n  Dec (J2000.0): -39.21244  =  -39:12:44.8\n  Error: 2.3 arcsec (radius, 90% conf. [Enhanced position])\n  Count-rate: 0.0630 [+0.0091, -0.0090] ct s^-1   \n  Distance: 794 arcsec from Fermi/LAT position.\n  Flux: (1.76 [+0.26, -0.25])e-12 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 http://www.swift.ac.uk/xrt_products/TILED_GRB00067.\n\nThis circular is an official product of the Swift-XRT team.",
  "circularId": 21086,
  "createdOn": 1494454971000,
  "email": "antonino.dai@ifc.inaf.it",
  "subject": "GRB 170510A: Swift-XRT observations",
  "submitter": "Antonino D'Ai at IASF-PA  <antonino.dai@ifc.inaf.it>",
  "eventId": "GRB 170510A"
}