{
  "bibcode": "2009GCN..9925....1B",
  "body": "A. P. Beardmore, K. L. Page (U. Leicester) and E. Troja (NASA/GSFC/ORAU)\nreport on behalf of the Swift-XRT team :\n\nDue to a Moon constraint, the Swift-XRT could not observe the field of\nthe BAT short GRB 090916 (Troja et al., GCN Circ. 9913) until 9.3\nhours after the trigger. In 12.3 ks of Photon Counting mode data (from\n33.5 to 126.6 ks after the trigger) we do not detect any source\nwithin the BAT refined error circle of Barthelmy et al. (GCN Circ. 9915).\nThe 3 sigma upper limit 0.3-10 keV count rate is 8 x 10^-4 count s^-1,\nwhich corresponds to an observed flux limit of 3 x 10^-14 erg cm^-2 s^-1\n(assuming a typical count-to-observed flux conversion factor of\n3.8 x 10^-11 erg cm^-2 ct^-1, Evans  et al., 2009, MNRAS, 397, 1177).\n\nThis circular is an official product of the Swift-XRT team.",
  "circularId": 9925,
  "createdOn": 1253288669000,
  "email": "apb@star.le.ac.uk",
  "subject": "GRB 090916: Swift-XRT upper limit",
  "submitter": "Andy Beardmore at U Leicester  <apb@star.le.ac.uk>",
  "eventId": "GRB 090916"
}