{
  "bibcode": "2011GCN.11565....1S",
  "body": "G. Stratta (ASDC) reports on behalf of the Swift-XRT team:\n\nSwift performed a second target of opportunity observation of GRB 110107A on\nJanuary 12, 2011.\n\nThe XRT began observing the field at 2011-01-12 18:07:47 UT, that is T+420.7\nks (4.87 days) (Cummings, GCN Circ. 11545).\nUsing 2.1 ks of Photon Counting mode data we find that the source has faded\ndown to a 3-sigma upper limit of 0.007 counts/s.\nAssuming a power law decay starting from the first source detection (Stratta\net al., GCN Circ. 11547), the upper limit\nis consistent with a decay index steeper than alpha = -0.4.\n\nThe fading nature of the source confirms its afterglow origin.\n\nThis circular is an official product of the Swift-XRT team.",
  "circularId": 11565,
  "createdOn": 1294939396000,
  "email": "giulia.stratta@gmail.com",
  "subject": "GRB 110107A: Swift-XRT afterglow confirmation",
  "submitter": "Giulia Stratta at ASDC  <giulia.stratta@gmail.com>",
  "eventId": "GRB 110107A"
}