TITLE: GCN CIRCULAR NUMBER: 11719 SUBJECT: GRB110213A: MITSuME Okayama Optical Observation DATE: 11/02/14 00:25:08 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 110213A (D'Elia et al., GCNC 11705) 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 2011-02-13 09:45:46 UT (~4.5 hours after the burst). We detected the previously reported afterglow (Cenko, GCNC 11706) in all the three bands. Photometric results and are listed below. We used GSC2.3 catalog for flux calibration. #T0+[day] MID-UT T-EXP[sec] g' g'_err Rc Rc_err Ic Ic_err ---------------------------------------------------------------------- 0.19696 10:01:06 1620.0 18.26 0.09 17.15 0.05 16.53 0.06 0.21845 10:32:02 1620.0 18.78 0.11 17.51 0.05 16.75 0.05 0.23993 11:02:59 1620.0 18.79 0.16 17.60 0.07 17.05 0.07 ---------------------------------------------------------------------- T0+ : Elapsed time after the burst [day] T-EXP: Total Exposure time [sec]