GCN Circular 20581
Subject
GRB 170202A: Kanata optical and infrared observations
Date
2017-02-02T23:12:08Z (7 years ago)
From
Michitoshi Yoshida at HASC,Hiroshima U <yoshidam@hiroshima-u.ac.jp>
Mori, H., Nakaoka, T., Kawabata, M., Hirochi, J., Kawahara, N.,
Yoshida, M., Kawabata, K. and Uemura, M. (Hiroshima Univ.) on
behalf of the OISTER collaboration
We performed R-band and Ks-band imaging observations around the
error circle of GRB 170202A (Racusin et al., GCN 20575) with the
optical imager HOWPol and opt-NIR imager HONIR attached to Kanata
telescope of Hiroshima University. The observations took place at
2017-02-02 18:33:37 UT (mid time of the observation). We detected
the optical transient reported by Xin et al.(GCN 20576), Lipunov
et al. (GCN 20578) and Guidorzi et al. (GCN 20579) in our R-band
and Ks-band images. The detected magnitude of the OT and five
sigma upper limit (in Vega magnitude) of the observations are
listed below.
# T0+ MID-UT T-EXP R mag. R err R limit
-----------------------------------------------------
335 18:33:37 30 16.35 0.3 18.0
-----------------------------------------------------
# T0+ MID-UT T-EXP Ks mag. Ks err Ks limit
-----------------------------------------------------
3208 19:21:30 1320 17.1 0.4 18.6
-----------------------------------------------------
T0+ : Elapsed time after the burst [sec]
T-EXP: Total Exposure time [sec]