TITLE: GCN CIRCULAR NUMBER: 11535 SUBJECT: GRB 110106A: MITSuME Okayama optical upper limits DATE: 11/01/07 04:51:09 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 110106A (Mangano et al., GCN 11520) 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 2011-01-06 15:26:22 UT (~65 sec after the burst). We did not find any new point source within the enhanced XRT error circle (Osborne et al., GCNC 11526) in all the three 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' Rc Ic ------------------------------------------------------ 0.00424 15:31:23 540.0 >20.0 >19.7 >18.8 0.09936 17:48:21 5040.0 >20.8 >20.4 >19.5 ------------------------------------------------------ T0+ : Elapsed time after the burst [day] T-EXP: Total Exposure time [sec]