TITLE: GCN CIRCULAR NUMBER: 24016 SUBJECT: GRB 190326A: MITSuME Okayama optical upper limits DATE: 19/03/27 06:52:18 GMT FROM: Masafumi Niwano at Tokyo Institute of Tech M. Niwano,�� K. L. Murata, R. Itoh, Y. Tachibana, K. Morita, K. Iida, K. Shiraishi, R. Adachi, M. Oeda,�� Y. Yatsu, and N. Kawai (Tokyo Tech) report on behalf of the MITSuME collaboration We searched for the optical counterpart of GRB 190326A (M. H. Siegel et al., GCN #24009) with optical three color (g', Rc, and Ic) cameras attached to the MITSuME 50 cm reflector in the Okayama��Astrophysical Observatory, Japan. The observation started at 19:01:19 UT which corresponds to 41151 sec��since the trigger. We did not find any new point source within the Swift BAT error circle (M. H. Siegel et al., GCN #24009) in all three bands. The obtained 5 sigma upper limits of the optical counterpart are summarize below: T0+[sec]������ MID-UT���������� T-EXP[sec]������ g'������������ Rc�������������� Ic ------------------------------------------------------------------------------------------------------- 41151�� 19:33:27�� 600���� >16.8�������� >16.8�������� >16.2 ------------------------------------------------------------------------------------------------------- T0+ : Elapsed time after the burst T-EXP: Total Exposure time We used UCAC-4 catalog for flux calibration.