{
  "bibcode": "2012GCN.13045....1G",
  "body": "C. Guidorzi (U. Ferrara), A. Melandri (INAF-OAB), F. Virgili (LJMU),\nJ. Japeli (U. Ljubljana)  on behalf of a larger collaboration report:\n\n\"The 2-m Faulkes Telescope North robotically followed up GRB 120311B\n(Swift trigger 517489, Marshall et al., GCN Circ 13038) 200 sec after\nthe GRB trigger time. Within the enhanced XRT error circle (Osborne et\nal., GCN Circ. 13042) we do not detect any object in R and i' filters\ndown to the following limits:\n\nMid time from       Exposure        Filter       Magnitude\nGRB (hr)            (s)\n----------------------------------------------------------\n0.29                240             R > 20.5\n0.39                220             i' > 20.3\n----------------------------------------------------------\n\nValues are calibrated against nearby USNOB-1 field stars.",
  "circularId": 13045,
  "createdOn": 1331542735000,
  "email": "guidorzi@fe.infn.it",
  "subject": "GRB 120311B: Faulkes Telescope North observations",
  "submitter": "Cristiano Guidorzi at Ferrara U,Italy  <guidorzi@fe.infn.it>",
  "eventId": "GRB 120311B"
}