TITLE: GCN CIRCULAR NUMBER: 11593 SUBJECT: GRB 110106A: CrAO optical observations DATE: 11/01/21 21:12:26 GMT FROM: Alexei Pozanenko at IKI, Moscow V. Rumyantsev, K. Antoniuk (CrAO), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration: We observed the field of the Swift GRB 110106A (Mangano et al., GCN 11520) with AZT-11 telescope of CrAO starting on Jan. 06 (UT) 16:26. In the enhanced Swift-XRT position (Osborne al., GCN 11526) we do not detect optical afterglow candidate (Malesani et al., GCN 11524) up to R=21.9. We clearly detect the nearby galaxy outside the error circle (Malesani et al., GCN 11524, Piranomonte et al., GCN 11530, Gorbovskoy et al., GCN 11542). The photometry is based on the USNO B1.0 star 1541-0130790 (05:17:11.42 +64:10:11.0) assuming R=17.81. The finding chart can be found at http://grb.rssi.ru/GRB110106A/grb110106a_110106_R_azt11.png T0+ Filter, Exposure, mag. (mid, d) (s) 0.06398 R 20x180 >21.9