[vsnet-grb-info 20409] GRB 180314A: MITSuME Okayama optical upper limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  22505
SUBJECT: GRB 180314A: MITSuME Okayama optical upper limits
DATE:    18/03/16 11:29:04 GMT
FROM:    Katsuhiro L. Murata at Nagoya U  <murata at u.phys.nagoya-u.ac.jp>

K. Shiraishi, R. Itoh, K. L. Murata, T. Yoshii, Y. Tachibana, S. Harita, K.
Morita, T. Ozawa, H. Mamiya, Y. Yatsu, and N. Kawai (Tokyo Tech)
report on behalf of the MITSuME collaboration:

We searched for the optical counterpart of GRB 180314A (P. D'Avanzo  et
al., GCN Circular #22478) with the optical three color (g', Rc, and Ic) CCD
cameras attached to the MITSuME 50 cm telescope of  Okayama Astrophysical
Observatory, Japan.

The observation started on 10:32:06 UT. We did not find any new point
source within enhanced XRT circle (J.P. Osborne et al., GCN Circular
#22480) in all three bands.
We obtained following limits for the magnitudes.


T0+[hour]    MID-UT      T-EXP[sec]    g'       Rc        Ic
------------------------------------------------------------
-------------------------------------------
9.99       12:03:20      7240     >19.3     >18.8     >18.6
------------------------------------------------------------
-------------------------------------------

T0+ : Elapsed time after the burst
T-EXP: Total Exposure time
We used GSC2.3 catalog for flux calibration.