{
  "bibcode": "2007GCN..6369....1V",
  "body": "S.D. Vergani (Dunsink observatory-DIAS, DCU), P. Romano\n(INAF-OAB, Univ. Bicocca), C. Guidorzi (INAF-OAB, Univ. Bicocca)\nreport on behalf of the Swift-XRT team:\n\nXRT observed again the field of INTEGRAL GRB 070309 (Paizis, et\nal. 2007, GCN Circ. 6182) between 26 and 27 April (about 50\ndays after the trigger) for a total exposure time of about 17ks\nto verify the nature of the afterglow candidate reported\nby Vergani et al. in GCN Circ.'s 6187 and 6200.\nThere is no source detected at the afterglow candidate position\n(RA(J2000) = 17h 34m 39.1s  Dec(J2000) = -37d 55' 48.2\")\ndown to a count rate of 1.43E-3 counts/s (3 sigma).\nWe therefore confirm that the candidate suggested in GCN\nCirc. 6187 is the afterglow of GRB 070309.\n\nThis Circular is an official product of the Swift XRT Team.",
  "circularId": 6369,
  "createdOn": 1177956994000,
  "email": "patrizia.romano@brera.inaf.it",
  "subject": "GRB 070309: Swift-XRT afterglow confirmation",
  "submitter": "Pat Romano at OAB-Swift  <patrizia.romano@brera.inaf.it>",
  "eventId": "GRB 070309"
}