{
  "bibcode": "2010GCN.10779....1K",
  "body": "D. Kopac (U. Ljubljana), C. Guidorzi (U. Ferrara), Z. Cano (Liverpool JMU),\nA. Gomboc (U. Ljubljana), report on behalf of a larger collaboration:\n\nThe 2-m Faulkes Telescope North observed the optical afterglow of\nGRB 100518A (Cano et al. GCN Circ. 10776) from 4.2 min to 3.7 hours from\nthe INTEGRAL trigger time (Mereghetti et al. GCN Circ. 10772) in\nthe BVRi filters.\nWithin this time interval the afterglow is observed to decay in both\nR and i filters with an average power-law decay slope of 0.7 +/- 0.1,\nwith the following initial magnitudes:\n\nMid time from   Total Exp   Filter    Magnitude\ntrigger (min)    (s)\n-------------------------------------------------\n4.9             3x10        R         19.4 +- 0.1\n9.8             10          i         18.8 +- 0.2\n-------------------------------------------------\n\nMagnitudes have been calibrated from nearby USNOB-1 stars.",
  "circularId": 10779,
  "createdOn": 1274259893000,
  "email": "guidorzi@fe.infn.it",
  "subject": "GRB 100518A: optical afterglow decay",
  "submitter": "Cristiano Guidorzi at Ferrara U,Italy  <guidorzi@fe.infn.it>",
  "eventId": "GRB 100518A"
}