{
  "bibcode": "2015GCN.18703....1H",
  "body": "L. K. Hardy (Sheffield), S. P. Littlefair (Sheffield),\nV. S. Dhillon (Sheffield, IAC), T. Butterley (Durham) and\nR. W. Wilson (Durham) report:\n\nThe automated robotic telescope 'pt5m' (Hardy et al.\n2015, MNRAS 454, 4316) on La Palma observed the field\nof GRB 151215A (Gibson et al., GCN 18691) starting\nat 03:02:42 UT on Dec 15, 53 seconds after the alert\nnotice release and 74 seconds after the GRB detection.\n\nObservations comprised of 59 x 60-second exposures in\nthe Johnson/Cousins R-band with approximately 6-seconds\ndead time between images. The final image was taken 65\nminutes after the first.\n\nWe detect the optical counterpart to the GRB and observe a\nrapidly declining light curve. Photometry is performed using\nhistorical instrumental zeropoints. We measure an initial\nmagnitude of R = 17.13 +/- 0.04 (2 minutes after the GRB) and\na final magnitude of R = 20.8 +/- 0.7 (67 minutes after the GRB).\n\nThe light curve is available at:\nhttp://slittlefair.staff.shef.ac.uk/images/grb151215.png",
  "circularId": 18703,
  "createdOn": 1450278194000,
  "email": "liam.hardy@sheffield.ac.uk",
  "subject": "GRB151215A: Early optical light curve from pt5m, La Palma",
  "submitter": "Liam K Hardy at U of Shffield  <liam.hardy@sheffield.ac.uk>",
  "eventId": "GRB 151215A"
}