GCN Circular 14645
A. Volnova (IKI), I. Korobtsev (ISTP), E. Klunko (ISTP), A. Pozanenko (IKI) on behalf of larger GRB follow-up collaboration: We continue observation of the Swift GRB 130427A (Maselli et al., GCN 14448) with AZT-33IK telescope of Sayan observatory (Mondy). The afterglow (Elenin et al. GCN 14450, Perley GCN 14451) is clearly detected. The brightness of the afterglow+host is following: UT start, t-t0 Filter Exp. OT (mid, days) (s) (mag.) 2013-05-13T15:20:00 16.3346 R 3600 20.66 +/- 0.06 2013-05-14T14:24:35 17.2968 R 3600 20.63 +/- 0.07 The photometry is based on the same star reported by Rumyantsev et al. (GCN 14582). After subtraction of a suggested brightness (R, Vega)of the host galaxy (e.g. Watson et al., GCN 14606; Kann et al., GCN 14631) from our photometric values, our light curve can be approximated (in general) by a single power law starting at ~ 0.6 days after burst trigger. Indeed our early observations suggest some flattening between 6.5 - 13 days (Xu et al., GCN 14597; Kann et al., GCN 14631). It could be due to a SN or due to a wide bump analogous to bumps observed early in the light curve. However photometry is still preliminary and more detailed calibration/intercalibration is necessary.