GCN Circular 18933
E. Mazaeva (IKI), I. Reva (Fesenkov Astrophysical Institute), A. Kusakin (Fesenkov Astrophysical Institute), A. Volnova (IKI), A. Pozanenko (IKI) report on behalf of a larger GRB follow-up collaboration: We observed the field of the Swift GRB 160121A (Hagen et al., GCN 18912) with Zeiss-1000 (East) 1-m telescope of Tien Shan Astronomical Observatory starting on Jan. 22 (UT) 16:17:07. We obtained several images in R filter. We do not detect afterglow (Oates et al., GCN 18917; Mazaeva et al., GCN 18920) in a combined image. Preliminary upper limit is following Date UT start t-T0 Filter Exp. OT UL (3 sigma) (mid, days) (s) 2015-01-22 16:17:07 1.13572 R 30*180 n/d 21.2 The photometry is based on nearby USNO-B1.0 stars (see GCN 18920).