TITLE: GCN CIRCULAR NUMBER: 12659 SUBJECT: GRB 111210A: MITSuME Okayama Optical upper limits DATE: 11/12/11 02:24:18 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 111123A (Siegel et al., GCNC 12650) 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 2011-12-10 17:54:08 UT (~3.3 h after the burst). We did not find any new point source within the enhanced XRT circle (Goad, et al., GCNC 12652) in all the three bands. Three sigma upper limits of the OT are listed below. We used SDSS catalog for flux calibration. T0+[day] MID-UT T-EXP[sec] g' Rc Ic ------------------------------------------------------ 0.17952 18:55:34 5640.0 >18.9 >19.3 >18.9 ------------------------------------------------------ T0+ : Elapsed time after the burst [day] T-EXP: Total Exposure time [sec]