TITLE: GCN CIRCULAR NUMBER: 11724 SUBJECT: GRB 110213A: MITSuME Akeno Optical Observation DATE: 11/02/14 14:52:06 GMT FROM: Nobuyuki Kawai at Tokyo Tech H. Nakajima, Y. Yatsu, T. Enomoto, K. Kawakami, K. Tokoyoda, T. Ohkawa, 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 Akeno Observatory. The observation started on 2011-02-13 8:37 UT (~3.3 hours after the burst). We detected the previously reported afterglow (Cenko et al., GCN 11706) in all three bands. Photometric results and are listed below. We used GSC2.3 catalog for flux calibration. T0+[day] MID-UT T-EXP[sec] g' Rc Ic ----------------------------------------------------------------------- 0.2083 10:17:51 2340 18.20+-0.06 17.28+-0.04 16.62+-0.04 ----------------------------------------------------------------------- T0+ : Elapsed time after the burst [day] T-EXP: Total Exposure time [sec]