TITLE: GCN CIRCULAR NUMBER: 13877 SUBJECT: GRB 121017A optical observations DATE: 12/10/17 21:48:00 GMT FROM: Alina Volnova at SAI MSU A. A. Volnova (SAI MSU, IKI RAS), A. S. Moskvitin (SAO RAS) on behalf of larger collaboration, reports We observed the field of GRB 121017A (Grupe et al., GCN Circ. 13875) with the 1-m Zeiss-1000 telescope of SAO RAS in Rc band. The weather conditions were good, airmass = 5 - 6, seeing = 2.6". Observations were started since 9.5 minutes after the BAT trigger, middle time t-t0 = 0.01407 days. We do not detect any object in the XRT error circle down to a limiting magnitude 18.8 as well as Jelínek et al. (GCN Circ. 13876).