{
  "bibcode": "2011GCN.12782....1G",
  "body": "C. Guidorzi (U. Ferrara), A. Melandri (INAF-OAB)\nreport on behalf of the LJMU GRB group:\n\nThe 2-m Faulkes Telescope South observed Swift\nGRB 111229A (Lien et al. GCN Circ. 12774)\non December 30, from 10:08 UT, corresponding to\n11.5 hours after the BAT trigger time.\nWe clearly detect the optical afterglow (Nicuesa\nGuelbenzu et al. GCN Circ 12775; Cucchiara et al.\nGCN Circ. 12777) in the R filter and marginally\nin the i' filter with the following magnitude:\n\nMid time from  Total Exp   Filter    Magnitude    Limit\ntrigger (hr)   (s)\n--------------------------------------------------------\n11.77          6x300       i'        21.6 +- 0.5 >20.9\n12.34          6x300       R         21.4 +- 0.1\n--------------------------------------------------------\n\nMagnitudes are calibrated against nearby USNOB-1 stars.\nComparing with GROND observations (Nicuesa Guelbenzu\net al GCN 12775), we derive an average power-law decay\nindex of about 0.8.",
  "circularId": 12782,
  "createdOn": 1325247391000,
  "email": "guidorzi@fe.infn.it",
  "subject": "GRB 111229A: Faulkes Telescope South observations",
  "submitter": "Cristiano Guidorzi at Ferrara U,Italy  <guidorzi@fe.infn.it>",
  "eventId": "GRB 111229A"
}