TITLE: GCN CIRCULAR NUMBER: 12730 SUBJECT: GRB111225A: MITSuME Okayama optical upper limits DATE: 11/12/26 02:09:16 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 111225A (Siegel et al., GCNC 12720) 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 2011-12-25 09:00:08 UT (~5.2 hours after the burst). We did not find any new point source within the enhanced XRT error circle (Evans et al., GCNC 12724) and could not detect the previously reported afterglow (Klotz et al., GCNC 12722; Updike et al., GCNC 12723) in g' and Ic bands. Three sigma upper limits of the OT are listed below. We used GSC2.3 catalog for flux calibration. T0+[day] MID-UT T-EXP[sec] g' Ic ------------------------------------------------------ 0.25569 09:58:49 5700.0 >20.2 >19.6 ------------------------------------------------------ T0+ : Elapsed time after the burst [day] T-EXP: Total Exposure time [sec]