{
  "bibcode": "2009GCN..9576....1A",
  "body": "G.C. Anupama, U.K. Gurugubelli, D.K. Sahu  report\n\nOptical afterglow of GRB090618 (Schady et al., GCN 9512) was observed\nwith the 2m.  Himalayan Chandra Telescope of the Indian Astronomical\nObservatory, Hanle, India. The optical afterglow was observed in\nBessell R filter and it was detected in all the frames.\n\nThe preliminary magnitude of the optical afterglow, calibrated\nusing the USNO B1 (R1 magnitude) of the nearby  stars in the\nGRB field is as under:\n Date         Mid UT    Exposure       R Mag     Error\n 18-06-2009   19:29     300sec         18.70     0.07\n 18-06-2009   19:36     300sec         18.75     0.06\n 19-06-2009   22:08     2x300+450      20.30     0.09",
  "circularId": 9576,
  "createdOn": 1245966090000,
  "email": "dks@iiap.res.in",
  "subject": "GRB090618: HCT optical observations",
  "submitter": "D.K. Sahu at Indian Inst of Astrophysics,Bangalore  <dks@iiap.res.in>",
  "eventId": "GRB 090618"
}