{
  "subject": "GRB111228A :LOAO R-band Observations",
  "eventId": "GRB 111228A",
  "bibcode": "2012GCN.12809....1J",
  "createdOn": 1325818213000,
  "circularId": 12809,
  "submitter": "Yiseul Jeon at SNU/CEOU  <ysjeon@astro.snu.ac.kr>",
  "email": "ysjeon@astro.snu.ac.kr",
  "body": "Minsung Jang, Myungshin Im, Yiseul Jeon (CEOU/Seoul National Univ.), and\nYuji Urata (NCU) on behalf of a larger collaboration\n\nWe continued our observation (Jeon et al. GCN 12791) of GRB 111228A\n(Ukwatta et al., GCN 12737) in R-band with a 1 m telescope at Mt. Lemmon,\nArizona, US. Data were taken at 2011-12-31 UT and 2012-01-01 UT. For both\nof them, we detected the afterglow in stacked R-band images.\n\nWe used a USNO B1 star near the afterglow, USNO-B1 1083-0199833 with\nR=17.28 following Klotz et al. (GCN 12746) for our photometry calibration,\nand current, rough estimates are given below.\n\nMid-time [UT]           | Mid-time[Since BAT] | Exptime [sec] | R-magnitude\n|\n-------------------------------------------------------------------------------------------------------------\n\n2011-12-31 08:40:25 |        64.92 hours       |    300sec X 7  | 21.5 +/-\n0.28 |\n2012-01-01 11:19:52 |        91.58 hours       |    300sec X 9  | 22.3 +/-\n0.36 |\n\n\nWe thank the LOAO operator, J. Yoon for his help with these observations."
}