GCN Circular 23711
Subject
GRB190109B: MITSuME Akeno optical upper limits
Date
2019-01-15T11:15:43Z (5 years ago)
From
Motoki Oeda at Tokyo Inst. of Tech. <oeda@hp.phys.titech.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
(TokyoTech)
report on behalf of the MITSuME collaboration:
We searched for the optical counterpart of GRB 190109B (B. Sbarufatti
et al.,GCN Circular #23648) 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 11:57:03.81 UT. We did not find any new
point source within the enhanced XRT circle (A.P. Beardmore et al.,
GCN Circular #23652) in all three bands. We obtained following 5 sigma
limits for the magnitudes.
T0+[min] MID-UT T-EXP[sec] g' Rc Ic
-------------------------------------------------------------------------------------------------------
0.913 11:57:33.81 60 >17.54 >17.26 >16.72
0.913 12:31:59.3 3660 >19.29 >17.67 >17.12
-------------------------------------------------------------------------------------------------------
T0+ : Elapsed time after the burst
T-EXP: Total Exposure time
We used UCAC-4 catalog for flux calibration.