{
  "bibcode": "2008GCN..8396....1E",
  "body": "P.A. Evans (U. Leicester) reports on behalf of the Swift-XRT team:\n\nSwift-XRT reobserved the field of the INTEGRAL GRB 081016A (Gotz  et al.\nGCN Circ. 8377) 5.2 days after the trigger, obtaining 3.8 ks of data in\nPhoton Counting (PC) mode. The source seen in the earlier XRT\nobservation (Evans, GCN Circ. 8379) was no longer detected. A\nthree-sigma upper limit on the count rate is 4.7e-3 counts/sec,\nsignificantly below the level of the previous detection (0.03\ncounts/sec). We therefore confirm that this was the afterglow of\nGRB 081016A.\n\nA spectrum formed from the first XRT observation, totalling 2 ks in PC\nmode, can be modelled with an absorbed power law with photon index\n2.60 (+0.94, -0.81). The absorption column is consistent with the\nGalactic value of 1.7e21 cm^-2 (Kalberla et al 2005). The counts to\nobserved (unabsorbed) flux conversion factor is 1.1e-12 (3.0e-12) erg\ncm^-2 ct^-1.\n\nThis circular is an official product of the Swift-XRT team.",
  "circularId": 8396,
  "createdOn": 1224686709000,
  "email": "pae9@star.le.ac.uk",
  "subject": "GRB 081016A: Swift-XRT refined analysis",
  "submitter": "Phil Evans at U of Leicester  <pae9@star.le.ac.uk>",
  "eventId": "GRB 081016A"
}