GCN Circular 20576
Subject
GRB 170202A : Xinglong TNT optical observation
Event
Date
2017-02-02T20:09:09Z (9 years ago)
From
L.P. Xin at NAOC <xlp@nao.cas.cn>
L. P. Xin, W. X, Li, J. Y. Wei, Y. L. Qiu, J. S. Deng,
J. Wang, X. H. Han, C. Wu and H. L. Li report:
We observed GRB 170202A (Racusin et al. GCN 20575) with
Xinglong 0.8-m TNT telescope at 18:29:00 UT, 58 sec after the burst.
The optical afterglow (Racusin et al. GCN 20575 ) was detected
in our white and R-band images, with a coordinate of
RA=10:10:03.48
DEC=05:00:42.29
Epoch=J2000
Which is consistent with report by UVOT detection ( Racusin et al. GCN 20575).
The brightness of the optical afterglow is about 18.9 mag
at the mid time of 69 sec afer the burst,
calibrated by the USNO B1.0 star (RA=10:10:03.29 DEC=04:59:37.4 R2=14.95mag).
The observations are continuous.
The message may be cited.