GCN Circular 20585
Subject
GRB 170202A: MITSuME Akeno Optical Observation
Date
2017-02-03T00:47:37Z (8 years ago)
From
Yutaro Tachibana at Tokyo Tech <tachibana@hp.phys.titech.ac.jp>
Y. Saito, R. Itoh, Y. Tachibana, K. Morita, Y. T. Yoshii, H. Ohuchi, Y. Yano, Y. Ono, T. Fujiwara, S. Harita, Y. Muraki, K. Saisho, Y. Ozawa, Y. Yatsu, and N. Kawai
(Tokyo Tech)
report on behalf of the MITSuME collaboration:
We searched for the optical counterpart of GRB 1710202A (J. L. Racusin et
al., GCN Circular #20575) 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 2017-02-02 18:28:41 UT (39 sec after the burst).
We detected the optical counterpart (J. L. Racusin et al., GCN Circular #20575
) in g', Rc and Ic band.
The measured magnitudes were listed as follows.
T0+[sec] MID-UT T-EXP[sec] g' Rc Ic
-------------------------------------------------------------------------------------------------------
54 18:28:56 30 >18.4 >17.7 >17.0
92 18:29:34 30 >19.1 17.01 +/- 0.12 17.08 +/- 0.25
131 18:30:13 30 17.61 +/- 0.13 16.38 +/- 0.09 15.89 +/- 0.12
-------------------------------------------------------------------------------------------------------
T0+ : Elapsed time after the burst
T-EXP: Total Exposure time
We used GSC2.3 catalog for flux calibration.