{
  "bibcode": "2010GCN.10589....1G",
  "body": "C. Guidorzi (U. Ferrara), R.J. Smith (Liverpool JMU),\nN. Tanvir (U. Leicester), I.A. Steele, S. Kobayashi,\nC.G. Mundell, D. Bersier, Z. Cano, N.R. Clay, A. Melandri,\nC.J. Mottram (Liverpool JMU), A. Gomboc (U. Ljubljana)\nreport on behalf of a large collaboration:\n\nOn 2010 April 13 at 17:37:19 UT the 2-m Faulkes Telescope South\nautomatically began observing the Swift GRB 100413A\n(Holland et al., GCN Circ. 10581) using the BVR, i' filters,\ncorresponding to 231 s after the burst trigger time.\n\nInside the XRT error circle (Goad et al. GCN Circ. 10584)\nwe do not detect any source at the following limiting\nmagnitudes:\n\nMid time from    Total Exp   Filter    Magnitude\ntrigger (min)    (s)\n------------------------------------------------\n04.52            3x10        R         > 19.8\n28.6              540        R         > 22.2\n33.2              520        i         > 21.3\n------------------------------------------------\n\nMagnitudes have been calibrated from nearby USNOB-1\nstars, using the R2 and I magnitudes.",
  "circularId": 10589,
  "createdOn": 1271248788000,
  "email": "guidorzi@fe.infn.it",
  "subject": "GRB 100413A: Faulkes Telescope South observations",
  "submitter": "Cristiano Guidorzi at Ferrara U,Italy  <guidorzi@fe.infn.it>",
  "eventId": "GRB 100413A"
}