TITLE: GCN CIRCULAR NUMBER: 19219 SUBJECT: GRB 160321A: AbAO optical observations DATE: 16/03/22 20:25:03 GMT FROM: Alexei Pozanenko at IKI, Moscow E. Mazaeva (IKI), A. Volnova (IKI), R. Inasaridze (AbAO), V. Ayvazian (AbAO), I. Molotov (KIAM), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration: We observed the field of Swift GRB 160321A (Stamatikos et al., GCN 19211) with AS-32 (0.7m) telescope of Abastumani Observatory starting on Mar. 21 (UT) 16:26:45. We obtained several unfiltered images of the field. We do not detect any source within enhanced XRT error circle (Beardmore et al., GCN 19213) down to 21.9m. A probable source (S/N = 2) detected 3.5 arcsec South from the center of XRT error circle (Beardmore et al., GCN 19213) in coordinates (J2000) 06:37:40.74 +05:44:48.2 +/- 0.5 arcsec in both coordinates. Preliminary photometry of the field is following Date UT start t-T0 Filter Exp. UL (3 sigma) (mid, days) (s) 2016-03-21 16:26:45 0.06839 none 41*120 21.9 Photometry is based on nearby USNO-B1.0 stars USNO-B1_id R2 0956-0104166 16.23 0957-0105913 15.38 0957-0106394 14.58 0956-0104566 15.41