TITLE: GCN CIRCULAR NUMBER: 20576 SUBJECT: GRB 170202A : Xinglong TNT optical observation DATE: 17/02/02 20:09:09 GMT FROM: L.P. Xin at NAOC 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.