{
  "bibcode": "2014GCN.17082....1D",
  "body": "S. Dichiara and C. Guidorzi (U. Ferrara) on behalf of\na large collaboration report:\n\nThe Las Cumbres Observatory 2-m Faulkes Telescope North in\nHawaii began observing Swift GRB 141121A (Lien et al. GCN\nCirc 17075) on November 21 at 10:42:54 UT, i.e. ~6.9 hours\nafter the BAT trigger, with the r' and i' filters.\n\nWe clearly detect the optical afterglow (Tanga et al.\nGCN 17078; Perley et al. GCN 17081) with the following\nmagnitudes:\n\nMid time from  Total Exp   Filter    Magnitude\ntrigger (hr)   (s)\n-------------------------------------------------\n7.0            120x5       r'        19.62 +- 0.06\n7.2            120x5       i'        19.42 +- 0.06\n-------------------------------------------------\n\nMagnitudes are calibrated against nearby SDSS stars.\nCompared with GROND values we note a possible hint\nfor rebrightening or, in any case, for a very shallow\ndecay between the two epochs.",
  "circularId": 17082,
  "createdOn": 1416573978000,
  "email": "guidorzi@fe.infn.it",
  "subject": "GRB 141121A: LCO-FTN observations",
  "submitter": "Cristiano Guidorzi at Ferrara U,Italy  <guidorzi@fe.infn.it>",
  "eventId": "GRB 141121A"
}