{
  "bibcode": "2013GCN.14410....1H",
  "body": "Veli-Pekka Hentunen, Markku Nissinen and Tuomo Salmi (Taurus Hill\nObservatory, Varkaus, Finland) report:\n\nWe have detected GRB 130420A optical afterglow at iTelescope \nObservatory T21 (Mayhill, New Mexico) 0.43-m/6.8 astrograph\nand FLI ProLine PL6303E CCD. Two unfiltered images with 600\nsec exposure time were made.\n\nThe afterglow was detected at following position RA 13:04:25.51\nand DEC +59:25:27.2.\n\nThe following magnitudes were obtained from the observations using \nNOMAD1 1494-0215473 (R=16.220) as the comparison:\n\nTmid(sec)+T0  Filter         Exp. time   Mag           Mag err.  Limit\n7258                unfiltered   600            19.49CR   0.20        20.60\n7885                unfiltered   600            19.61CR   0.24        20.48",
  "circularId": 14410,
  "createdOn": 1366463180000,
  "email": "veli-pekka.hentunen@kassiopeia.net",
  "subject": "GRB 130420A: T21 optical observations",
  "submitter": "Veli-Pekka Hentunen at Taurus Hill Obs,A95  <veli-pekka.hentunen@kassiopeia.net>",
  "eventId": "GRB 130420A"
}