{
  "bibcode": "2018GCN.23229....1D",
  "body": "V. D'Elia (ASDC), A. D'Ai (INAF-IASFPA), A. Melandri (INAF-OAB), A.\nTohuvavohu (PSU), S. J. LaPorte (PSU), J.A. Kennea (PSU), S.L. Gibson\n(U. Leicester), Z. Liu (NAOC / U. Leicester) and P.A. Evans (U.\nLeicester) report on behalf of the Swift-XRT team:\n\nSwift-XRT has performed follow-up observations of the\nFermi/LAT-detected burst GRB 180914A (Bissaldi et al. GCN Circ. 23225)\nin a series of observations tiled on the sky. The total exposure time\nis 1.8 ks, distributed over 7 tiles; the maximum exposure at a single\nsky location was 546 s. The data were collected between T0+40.9 ks and\nT0+43.0 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):  53.0804  =  03:32:19.29\n  Dec (J2000.0): -5.6243  =  -05:37:27.5\n  Error: 5.0 arcsec (radius, 90% conf.)\n  Count-rate: 0.162 [+0.048, -0.040] ct s^-1   \n  Distance: 1791 arcsec from Fermi/LAT position.\n  Flux: (7.7 [+2.3, -1.9])e-12 erg cm^-2 s^-1 (observed, 0.3-10 keV)\n\nWe note the presence of a bright star (with magnitude R~12.7, as\nreported in the USNOB1 catalogue) about 14\" away from Source 1.\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_GRB00074.\n\nThis circular is an official product of the Swift-XRT team.",
  "circularId": 23229,
  "createdOn": 1536998366000,
  "email": "paolo.davanzo@brera.inaf.it",
  "subject": "GRB 180914A: Swift-XRT observations",
  "submitter": "Paolo D'Avanzo at INAF-OAB  <paolo.davanzo@brera.inaf.it>",
  "eventId": "GRB 180914A"
}