TITLE: GCN CIRCULAR NUMBER: 14568 SUBJECT: GRB 130505A: MITSuME Okayama Optical Observation DATE: 13/05/05 12:02:12 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 130505A (Cannizzo et al., GCNC 14563) 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 2013-05-05 10:52:56 UT (~2.5 h after the burst). We detected the previously reported afterglow (Cannizzo et al., GCNC 14563) in all the three bands. Photometric results of the OT 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 ----------------------------------------------------------------------- 0.11507 11:08:09 1620.0 18.2 0.1 18.2 0.1 17.6 0.1 ------------------------------------------------------------------------ T0+ : Elapsed time after the burst [day] T-EXP: Total Exposure time [sec]