{
  "bibcode": "2009GCN..9541....1I",
  "body": "M. Im (CEOU/Seoul National Univ), Y.-B. Jeon (KASI), and\n  Y. Urata (NCU)\n\n   We observed GRB090618 (Schady et al. GCN 9512) in V using\n  a 15.5cm refractor at Bohyunsan Optical Astronomical Observatory\n  in Korea, operarted by the Korea Astronomy Space Science Institute.\n   A series of exposures were taken starting at 2009 June 18, 11:54:19.\n   The afterglow, identified earlier by many groups\n  (GCN 9513, 9514, 9515, 9520, 9522), was clearly detected\n  at V=17.9 +- 0.1 magnitude at mid-time of 2009 12:55:07\n  (about 4hr 26.6min after the BAT trigger).\n   The photometry was calibrated against nearby SDSS stars\n  where the transformation of SDSS magnitude to V-band magnitude\n  was carried out using the recipe of Chonis & Gaskell (2008).",
  "circularId": 9541,
  "createdOn": 1245564595000,
  "email": "mim@astro.snu.ac.kr",
  "subject": "GRB 090618: BOAO V-band Observation",
  "submitter": "Myungshin Im at Seoul Nat U  <mim@astro.snu.ac.kr>",
  "eventId": "GRB 090618"
}