TITLE: GCN CIRCULAR NUMBER: 27878 SUBJECT: GRB 200529A: MITSuME Akeno optical upper limits DATE: 20/06/01 06:45:39 GMT FROM: Ogawa Futa at Tokyo Institute of Technology F. Ogawa, R. Adachi, R. Hosokawa, M. Niwano, K. L. Murata, N. Nakamura, Y. Yatsu, and N. Kawai(TokyoTech) report on behalf of the MITSuME collaboration: We observed the field of GRB 200529A (Fermi GBM team, GCN #27844; D'Elia et al. GCN #27845) with the optical three color (g', Rc, and Ic) CCD cameras attached to the MITSuME 50 cm telescope of Akeno Observatory, Yamanashi, Japan. The observation started on 10:25:35 UT. The first 47 images were heavily affected by the bad weather at Akeno Observatory. We did not detect the optical afterglow (Daniele et al., GCN #27846; WeiKang et al., GCN #27847; Strausbaugh et al., GCN #27858) in the stacked image. We obtained the 5-sigma limits as follows. T0+[hour] MID-UT T-EXP[sec] 5-sigma limits ------------------------------------------------------------------------------------------------ 10.3 11:35:06 1140 g'>17.3, Rc>17.1, Ic>16.5 ------------------------------------------------------------------------------------------------ T0+: Elapsed time after the burst T-EXP: Total Exposure time We used UCAC4 catalog for flux calibration. The magnitudes are expressed in the AB system. The images were processed in real-time through the MITSuME GPU reduction pipeline (Niwano et al., submitted; https://github.com/MNiwano/Eclair)