[vsnet-grb-info 21917] GRB 190326A: MITSuME Okayama optical upper limits

[GCN Circulars]

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  <niwano at hp.phys.titech.ac.jp>

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.