GCN Circular 21652
Subject
GRB 170822A: MITSuME Akeno Optical Observation
Date
2017-08-23T07:15:59Z (7 years ago)
From
Katsuhiro L. Murata at Nagoya U <murata@u.phys.nagoya-u.ac.jp>
K. L. Murata, Y. Saito, R. Itoh, Y. Tachibana, T. Yoshii, S. Harita, K.
Morita, T. Ozawa, H. Mamiya, K. Shiraishi, Y. Yatsu, and N. Kawai (Tokyo
Tech)
report on behalf of the MITSuME collaboration:
We searched for the optical counterpart of GRB 170822A (Melandri et al.,
GCN Circular #21640) 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 2017-08-22 16:27:38.15 UT . We did not find any
new point source within enhanced XRT circle (Evans et al., GCN Circular
#21643) in all three bands.
We obtained following limits for the magnitudes.
T0+[hour] MID-UT T-EXP[sec] g' Rc
Ic
-------------------------------------------------------------------------------------------------------
~7.21 16:48:33.09 2280 >20.8 >20.1
>18.9
-------------------------------------------------------------------------------------------------------
T0+ : Elapsed time after the burst
T-EXP: Total Exposure time
We used GSC2.3 catalog for flux calibration.