[vsnet-grb-info 20244] GRB 180115A: MITSuME Akeno optical upper limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  22340
SUBJECT: GRB 180115A: MITSuME Akeno optical upper limits
DATE:    18/01/15 11:42:54 GMT
FROM:    Katsuhiro L. Murata at Nagoya U  <murata at u.phys.nagoya-u.ac.jp>

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

We searched for the optical counterpart of GRB 180115A (Cannizzo et al.,
GCN Circular #22335) 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 2018-01-15 09:25:40 UT. We did not find the
previously reported candidate afterglow (Cannizzo et al., GCN Circular
#22335) in all three bands.
We obtained following limits for the magnitudes.

T0+[hour]    MID-UT      T-EXP[sec]    g'       Rc        Ic
-------------------------------------------------------------------------------------------------------
~5.16       10:06:44      4320       >19.8    >19.6     >19.0
-------------------------------------------------------------------------------------------------------

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