TITLE: GCN CIRCULAR NUMBER: 11652 SUBJECT: GRB110205A: MITSuME Ishigakijima Optical Observation DATE: 11/02/06 16:23:27 GMT FROM: Daisuke Kuroda at OAO/NAOJ D. Kuroda (OAO, NAOJ), H. Hanayama, T. Miyaji, J. Watanabe (IAO, NAOJ), K. Yanagisawa (OAO, 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 Murikabushi 1m telescope of Ishigakijima Astronomical Observatory. The observation started on 2011-02-05 12:15:24 UT (~10.2 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 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 ---------------------------------------------------------------------- 0.45691 13:00:38 4500.0 21.0 0.2 20.2 0.1 19.8 0.2 0.76876 20:29:42 4620.0 21.5 0.2 20.8 0.1 20.2 0.2 ---------------------------------------------------------------------- T0+ : Elapsed time after the burst [day] T-EXP: Total Exposure time [sec]