TITLE: GCN CIRCULAR NUMBER: 12480 SUBJECT: GRB 111022B: MITSuME Akeno Optical upper limits DATE: 11/10/23 07:51:48 GMT FROM: Yoichi Yatsu at Tokyo Tech. Y. Aoki, R. Usui, K. Tokoyoda, Y. Yatsu, K. Kawakami, M. Hayashi, S. Song, and N. Kawai (Tokyo Tech) report on behalf of the MITSuME collaboration: We observed GRB 111022B (S.T. Holland et al, GCN12472) with the optical three color (g, Rc, and Ic) CCD camera attached to the MITSuME 50 cm telescope of Akeno Observatory, Yamanashi, Japan. The follow-up observation was started at 18:09:58, ~ 57 min after the BAT trigger because of bad weather. We did not find any new point source within the enhanced XRT error circle (A.P. Beardmore et al, GCN12478) in three bands. Photometric results and are listed below. We used GSC2.3 catalog for flux calibration. T0+[s] MID-UT T-EXP[sec] g' Rc Ic --------------------------------------------------------------------------------- +7317 19:54:13 540 >17.8 >17.7 --- +10426 20:12:52 360 --- --- >16.5 --------------------------------------------------------------------------------- T0+ : Elapsed time after the burst [sec] T-EXP: Total Exposure time [sec]