TITLE: GCN GRB OBSERVATION REPORT NUMBER: 5036 SUBJECT: GRB060428B: optical observation DATE: 06/04/29 17:06:34 GMT FROM: Alexei Pozanenko at IKI, Moscow V.Rumyantsev (CrAO), V.Biryukov (SAI, MSU), and A.Pozanenko (IKI) on behalf of larger GRB follow up collaboration report: We observed the optical afterglow (Price et al. GCN5019; Li et al. GCN5027) of Swift GRB060428B (Campana et al. GCN 5017) in the R band with Shajn 2.6m telescope of CrAO between April 28 (UT) 18:43 -- 20:41, i.e. 9.8 -- 11.8 hrs after the burst onset. The afterglow is visible on a combined image of a total exposure 3240 sec in a tail of the nearby galaxy (Halpern et al. GCN5034) and precise photometry is underway. Based on USNO A2.0 we estimate limiting magnitude of the combined image as R=24.3. Combined image can be found in http://grb.rssi.ru/GRB060428/grb060428_ZTSH_R.gif The message may be cited.