TITLE: GCN CIRCULAR NUMBER: 18891 SUBJECT: GRB 151228B: AbAO optical upper limit DATE: 16/01/18 21:23:00 GMT FROM: Alexei Pozanenko at IKI, Moscow E. Mazaeva (IKI), R. Inasaridze (AbAO), V. Ayvazian (AbAO), A. Volnova (IKI), I. Molotov (KIAM), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration: We observed the field of the Swift GRB 151228B (Lien et al., GCN 18739) with AS-32 (0.7m) telescope of Abastumani Observatory starting on Dec. 29 (UT) 14:38:28. We do not detect any source within enhanced XRT error circle (Goad et al., GCN 18743): Date UT start t-T0 Filter Exp. UL(3 sigma) (mid, days) (s) 2015-12-29 14:38:28 0.69297 None 35*120 22.1 The photometry is based on nearby SDSS-DR9 stars: SDSS-DR9_id R_Lupton J225738.02+080336.8 18.18 J225747.18+080340.7 16.86 J225736.71+080628.4 17.72 J225752.89+080438.1 17.46 J225726.79+080540.6 16.99