GCN Circular 23778
Subject
GRB190123A: MITSuME Akeno optical upper limits
Event
Date
2019-01-24T10:11:22Z (8 years ago)
From
Kazuki Shiraishi at Tokyo Institute of Technology <shiraishi@hp.phys.titech.ac.jp>
K. Shiraishi, K. L. Murata, R. Itoh, Y. Tachibana, S. Harita,
K. Morita, K. Iida, M. Niwano, 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 190123A (A. D'Ai et al., GCN #23769)
with the optical three color (g', Rc, and Ic)
CCD cameras attached to the MITSuME 50 cm telescope at Akeno
Observatory,Yamanashi, Japan.
The observation started on 12:20:56 UT which corresponds to 103 sec
after the trigger.
We did not find any new point source within the enhanced XRT circle
D���Ai et al., GCN #23769; A.P. Beardmore et al., GCN #23771) in all three bands.
We obtained following 5 sigma limits for the magnitudes.
T0+[sec] MID-UT T-EXP[sec] g' Rc Ic
-------------------------------------------------------------------------------------------------------
103 12:25:31 540 >18.2 >17.8 >17.0
723 12:35:51 540 >17.9 >17.7 >17.6
1,764 14:21:35 10,800 >18.4 >18.2 >17.4
-------------------------------------------------------------------------------------------------------
T0+ : Elapsed time after the burst
T-EXP: Total Exposure time
We used UCAC-4 catalog for flux calibration.