GCN Circular 28269
Subject
GRB 200819A: MITSuME Akeno optical upper limits
Date
2020-08-19T23:59:46Z (4 years ago)
From
Katsuhiro L. Murata at Nagoya U <murata@u.phys.nagoya-u.ac.jp>
K. L. Murata, R. Hosokawa, R. Adachi, M. Niwano, F. Ogawa, N.
Nakamura, N. Ito, S. Ogata, H. Takamatsu, H. Hara, Y. Yatsu, and N.
Kawai (Tokyo Tech), Takashi Horiuchi, Hidekazu Hanayama (NAOJ) report
on behalf of the MITSuME collaboration:
We observed the field of GRB 200819A (Dichiara et al., GCN 28263;
Evans et al., GCN 28265) 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 with a series of 60 sec exposures started on
2020-08���19 15:45:44 UT. Some images were heavily affected by bad
weather conditions. We stacked the images with good weather
conditions. We did not find any new point sources within the enhanced
Swift/XRT error circle (Evans et al., GCN 28265) of the stacked
images. We obtained the 5-sigma limits as follows.
T0+[sec] MID-UT T-EXP[sec] 5-sigma limits
------------------------------------------------------------------------------------------------
~290 2020-08-19T17:36:48 5640 g���>18.4, Rc>19.0, Ic>19.3
------------------------------------------------------------------------------------------------
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., submitted;
https://github.com/MNiwano/Eclaire)