TITLE: GCN CIRCULAR NUMBER: 12791 SUBJECT: GRB 111228A: LOAO Optical Observation DATE: 11/12/31 11:58:29 GMT FROM: Myungshin Im at Seoul Nat U Yiseul Jeon, Myungshin Im, Minsung Jang (CEOU/Seoul National Univ.), and Yuji Urata (NCU) on behalf of a larger collaboration We observed GRB 111228A (Ukwatta et al., GCN 12737) in B- and R-bands with a 1 m telescope at Mt. Lemmon, Arizona, US. The observation started at 2011-12-30 08:03:16 UT, or 1.7 days after the BAT aleart. We detected the afterglow in the images taken with both filters. Using the the photometry calibration based on an USNO B1 star USNO-B1 1083-0199833 with B=18.85 and R=17.28 following Klotz et al. (GCN 12746), we find the following. Filter Mid-Time[UT] Mid-Time[Since BAT] Mag B-band 2011-12-30 08:33:55 40.82 hours 21.75+-0.14 R-band 2011-12-30 10:41:29 42.95 hours 20.67+-0.09 Further observation is ongoing. We thank the LOAO operator, J. Yoon for his help with the observation.