TITLE: GCN CIRCULAR NUMBER: 14907 SUBJECT: GRB 130610A: CrAO optical observations DATE: 13/06/15 23:18:24 GMT FROM: Alexei Pozanenko at IKI, Moscow V. Rumyantsev (CrAO), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration: We observed of the field of the Swift GRB 130610A (Cummings et al., GCN 14842) with Shajn telescope of CrAO starting on June, 10 (UT) 19:03:05. Several exposures of 120 s were obtained in R-filter. In the combined image we clearly detected bright point-like source superimposed on an extended object. Coordinates of the bright object (J2000) 14 57 40.85 +28 12 25.5 (uncertainty of 0.2" in both coordinates) coincide with the afterglow coordinates (Cummings et al., GCN 14842; Melandri et al., GCN 14843). The extended object could be a host galaxy with brightness of R ~ 23.8. Preliminary photometry might be biasedby the extended object and based on the USNO B1.0 star 1182-0253576 14 57 45.41 +28 12 57.7 assuming R=18.98: UT start, T0+ Filter Exposure, OT, UL mid,days s 2013-06-10T19:03:05 0.6860 R 35*120 21.70 +/- 0.05 23.9 A finding chart can be found at http://grb.rssi.ru/GRB130610A/GRB130610a_20130610_R_ZTSh.GIF