GCN Circular 14481
M. Im, C. Choi (CEOU/SNU), H.-I. Sung, Y.-B. Jeon (KASI), and Y. Urata (NCU) on behalf of a larger collaboration We continued our follow-up imaging observation of GRB 130427A (Maselli et al., GCN 14448) in BVRI filters at Seoul National University Observatory (SNUO, 0.6m), Sobaeksan Optical Astoronomy Observatory (SOAO, 0.6m), and Bohyunsan Optical Astronomy Observatory (BOAO), all located in Korea. The observations span the time period of about 4 hrs between 04-27 11:28 and 04-27 15:48 UT. The GRB afterglow (e.g., Elenin et al. GCN 14450; Im GCN 14464) is identified in the observed frames at magnitudes of ~16-17 mag Further analysis of the data is ongoing, and additional follow-up observation with these and other facilities is ongoing and planned. We thank the staffs of SOAO for performing the ToO observation.