{
  "bibcode": "2013GCN.14414....1M",
  "body": "A. Melandri (INAF-OAB), C. Guidorzi (U. Ferrara) and C. G. Mundell  \n(Liverpool) report on behalf of a larger collaboration:\n\nThe 2-m Faulkes Telescope North (FTN) automatically began observing  \nGRB130420B (Oates et al., GCN 14411) on April 20, 12:59:50 UT  \ncorresponding to ~200 seconds after the burst event.\n\nWe detect no new, uncatalogued source in the BAT error circle down to  \nthe following limiting magnitudes:\n\nMid time from   Exp    Filter   Mag limit\ntrigger (min)   (sec)\n---------------------------------------------------\n28.62           540      R       > 20.5\n32.75           520      I        > 20.0\n---------------------------------------------------\n\nThe magnitudes are calibrated against nearby USNO-B1.0 stars.",
  "circularId": 14414,
  "createdOn": 1366467532000,
  "email": "andrea.melandri@brera.inaf.it",
  "subject": "GRB 130420B: Faulkes Telescope North observations",
  "submitter": "Andrea Melandri at INAF-OAB  <andrea.melandri@brera.inaf.it>",
  "eventId": "GRB 130420B"
}