TITLE: GCN CIRCULAR NUMBER: 11828 SUBJECT: GRB / X-ray transient 110328A: MITSuME OkayamaOptical upper limits DATE: 11/03/29 01:34:43 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 / X-ray transient 110328A (Cummings et al., GCN 11823) 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 2011-03-28 13:21:15 UT (~24 min after the burst). We did not find any new point source within the XRT circle (Cummings et al., GCNC 11823) 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 ------------------------------------------------------ 0.04784 14:06:38 4740.0 >19.5 >19.7 >19.0 0.11100 15:37:35 4740.0 >20.4 >20.2 >19.6 0.24717 18:53:40 4440.0 >20.7 >20.4 >19.7 ------------------------------------------------------ T0+ : Elapsed time after the burst [day] T-EXP: Total Exposure time [sec]