GCN Circular 26864
Subject
GRB 200122A: MITSuME Akeno optical upper limits
Date
2020-01-23T06:48:06Z (5 years ago)
From
Adachi Ryo at Tokyo Institute of Tech <adachi@hp.phys.titech.ac.jp>
R. Adachi, K. L. Murata, M. Niwano, F. Ogawa, R. Hosokawa, N.
Nakamura, S. Toma, M. Oeda, K. Shiraishi, K. Iida, Y. Yatsu, and N.
Kawai(TokyoTech) report on behalf of the MITSuME collaboration:
We searched for the optical counterpart of GRB 200122A (E. Sonbas et
al.,GCN Circular #26844) 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 14:39:41 UT. Then the observation stopped
due to the bad weather and started again at 16:20:20 UT. We did not
find any new point sources within the Swift-XRT error circle (J.P.
Osborne et al., GCN Circular #26846) in all three bands.
We obtained the 5-sigma limits as follows.
T0+[hour] MID-UT T-EXP[sec] 5-sigma limits
------------------------------------------------------------------------------------------------
14.66 17:41:47 7140 g'>18.6,Rc>18.8,Ic>18.1
------------------------------------------------------------------------------------------------
T0+ : Elapsed time after the burst
T-EXP: Total Exposure time
We used Pan-STARRS DR1 catalog for flux calibration.
The magnitudes are expressed in the AB system.
The images were processed in real-time through the MITSuME GPU
reduction pipeline (Niwano et al. ,in prep;
https://github.com/MNiwano/Eclair)