TITLE: GCN CIRCULAR NUMBER: 18990 SUBJECT: GRB 160203A: TSHAO optical observations DATE: 16/02/05 13:54:34 GMT FROM: Alexei Pozanenko at IKI, Moscow A. Volnova (IKI), E. Mazaeva (IKI), A. Kusakin (Fesenkov Astrophysical Institute), A. Pozanenko (IKI) report on behalf of a larger GRB follow-up collaboration: We observed the field of the Swift GRB 160203A (D'Avanzo et al., GCN 18979) with Zeiss-1000 (West) 1-m telescope of Tien Shan Astronomical Observatory starting on Feb. 03 (UT) 20:31:45. We obtained several images in R filter. We marginally (S/N ~ 2) detect afterglow (Kruehler et al., GCN 18980) in a combined image. Preliminary photometry of the afterglow is following Date UT start t-T0 Filter Exp. OT Err (mid, days) (s) 2016-02-03 20:31:45 0.80045 R 21*300 23.0 0.5 The photometry is based on nearby USNO-B1.0 stars: USNO-B1.0_id R2 0652-0250834 18.04 0651-0249689 18.51