{
  "bibcode": "2011GCN.12791....1J",
  "body": "Yiseul Jeon, Myungshin Im, Minsung Jang (CEOU/Seoul National\n  Univ.), and Yuji Urata (NCU) on behalf of a larger collaboration\n\n  We observed GRB 111228A (Ukwatta et al., GCN 12737) in\n  B- and R-bands with a 1 m telescope at Mt. Lemmon, Arizona, US.\n\n  The observation started at 2011-12-30 08:03:16 UT,\n  or 1.7 days after the BAT aleart. We detected the afterglow\n  in the images taken with both filters.\n  Using the the photometry calibration based on an USNO B1 star\n  USNO-B1 1083-0199833 with B=18.85 and R=17.28 following Klotz et al.\n  (GCN 12746), we find the following.\n\n  Filter Mid-Time[UT] Mid-Time[Since BAT] Mag\n  B-band 2011-12-30 08:33:55 40.82 hours 21.75+-0.14\n  R-band 2011-12-30 10:41:29 42.95 hours 20.67+-0.09\n\n  Further observation is ongoing. We thank the LOAO operator,\n  J. Yoon for his help with the observation.",
  "circularId": 12791,
  "createdOn": 1325332709000,
  "email": "mim@astro.snu.ac.kr",
  "subject": "GRB 111228A: LOAO Optical Observation",
  "submitter": "Myungshin Im at Seoul Nat U  <mim@astro.snu.ac.kr>",
  "eventId": "GRB 111228A"
}