{
  "bibcode": "2011GCN.12635....1G",
  "body": "C. Guidorzi (U. Ferrara), A. Melandri (INAF-OAB),\nS. Kobayashi, C.G. Mundell (LJMU), A. Gomboc (U. Ljubljana)\nreport on behalf of the LJMU GRB group:\n\nThe 2-m Faulkes Telescope North robotically followed\nup Swift GRB 111209A (Hoversten et al. GCN Circ. 12632)\nfrom 07:20:00 UT, corresponding to 7.9 minutes after the\nBAT trigger time.\nWithin the XRT error circle we clearly detect the optical\nafterglow in the i' filter reported by Klotz et al. (GCN 12633)\nand Fugazza et al. (GCN 12634) with the following magnitude:\n\nMid time from  Total Exp   Filter    Magnitude\ntrigger (s)    (s)\n-------------------------------------------------\n697            30           i'       18.3 +- 0.2\n-------------------------------------------------\n\nMagnitude has been calibrated from I nominal\nvalues of nearby USNOB1.0 stars.",
  "circularId": 12635,
  "createdOn": 1323426593000,
  "email": "guidorzi@fe.infn.it",
  "subject": "GRB 111209A: Faulkes Telescope North observations",
  "submitter": "Cristiano Guidorzi at Ferrara U,Italy  <guidorzi@fe.infn.it>",
  "eventId": "GRB 111209A"
}