TITLE: GCN CIRCULAR NUMBER: 11651 SUBJECT: GRB110205A: MITSuME Okayama Optical Observation DATE: 11/02/06 16:19:56 GMT FROM: Daisuke Kuroda at OAO/NAOJ D. Kuroda, K. Yanagisawa, Y. Shimizu, H. Toda (OAO, NAOJ), S. Nagayama (NAOJ), M. Yoshida (Hiroshima), K. Ohta (Kyoto) and N. Kawai(Tokyo Tech) report on behalf of the MITSuME collaboration: We observed the field of GRB 110205A (Beardmore et al., GCNC 11629) with the optical three color (g', Rc and Ic) CCD camera attached to the MITSuME 50cm telescope of Okayama Astrophysical Observatory. The observation started on 2011-02-05 10:37:55 UT (~8.6 hours after the burst). We detected the previously reported afterglow (Klotz et al., GCNC 11630; Schaefer et al., GCNC 11631) in all the three bands. Photometric results and are listed below. We used SDSS catalog for flux calibration. #T0+[day] MID-UT T-EXP[sec] g' g'_err Rc Rc_err Ic Ic_err ---------------------------------------------------------------------- 0.39965 11:38:11 6120.0 >20.1 19.4 0.2 18.5 0.2 0.48327 13:38:36 6300.0 20.6 0.3 20.4 0.3 19.7 0.3 0.56675 15:38:49 6300.0 21.2 0.4 19.8 0.2 19.7 0.2 ---------------------------------------------------------------------- T0+ : Elapsed time after the burst [day] T-EXP: Total Exposure time [sec]