GCN Circular 23590
Subject
GRB 181228A: MITSuME Akeno optical upper limits
Date
2018-12-30T12:22:33Z (5 years ago)
From
Katsuhiro L. Murata at Nagoya U <murata@u.phys.nagoya-u.ac.jp>
M. Oeda, K. L. Murata, R. Itoh, Y. Tachibana, S. Harita, K. Morita, K.
Shiraishi, K. Iida, M. Niwano, R. Adachi, Y. Yatsu, and N. Kawai (Tokyo
Tech)
report on behalf of the MITSuME collaboration:
We searched for the optical counterpart of GRB 181228A (M. J. Moss et al.,
GCN Circular #23570) 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 09:04:35.19 UT. We did not find any new point
source within the enhanced XRT circle (A.P. Beardmore et al., GCN Circular
#23574) in all three bands. We obtained following limits for the magnitudes.
T0+[hour] MID-UT T-EXP[sec] g' Rc Ic
-------------------------------------------------------------------------------------------------------
6.188 13:04:51 25320 >19.1 >19.0 >18.6
-------------------------------------------------------------------------------------------------------
T0+ : Elapsed time after the burst
T-EXP: Total Exposure time
We used UCAC-4 catalog for flux calibration.