GCN Circular 28992
Subject
GRB 201203A: MITSuME Okayama optical upper limits
Date
2020-12-04T08:01:15Z (3 years ago)
From
Masafumi Niwano at Tokyo Institute of Tech <niwano@hp.phys.titech.ac.jp>
M. Niwano, R. Hosokawa, K. L. Murata, R. Adachi, F. Ogawa, N. Nakamura,
N. Ito, S. Ogata, H. Takamatsu, H. Hara, Y. Yatsu, and N. Kawai (TokyoTech)
report on behalf of the MITSuME collaboration:
We observed the field of GRB 201203A (S. Dichiara et al.,GCN Circular
#28985) with the optical three color (g', Rc, and Ic) CCD cameras
attached to the MITSuME 50 cm telescope of Okayama Astrophysical
Observatory, Okayama, Japan.
The observation started at 12:02:06 UT. We did not find any new point
sources within the Swift-XRT circle ( V. D'Elia et al., GCN Circular
#28990) in all three bands.
We obtained the 5-sigma limits as follows.
T0+[hour]�� MID-UT�� T-EXP[sec]�� 5-sigma limits
------------------------------------------------------------------------------------------------
6.9�� 13:45:28.19�� 9000�� g'>17.9, Rc>18.6, Ic>17.7
------------------------------------------------------------------------------------------------
T0+ : Elapsed time after the burst
T-EXP: Total Exposure time
We used the PS1 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., 10.1093/pasj/psaa091, arXiv:2008.11486;
https://github.com/MNiwano/Eclaire).