TITLE: GCN CIRCULAR NUMBER: 14517 SUBJECT: GRB 130427A: Nishi-Harima Optical Spectroscopic Observations DATE: 13/04/30 18:06:47 GMT FROM: Akira Arai at Nishi-Harima Astro._Obs/U_of_Hyogo A. Arai, J. Takahashi, K. Morihana, S. Honda and Y. Takagi (Univ. of Hyogo) report on behalf of Nayuta team: We performed low resolution ( R ~ 500) optical spectroscopic observations of a source on the position of GRB 130427A (Masell et al., GCNC 14448) with MALLS attached to the Nayuta 2-m telescope at the Nishi-Harima Astronomical Observatory. The observations were conducted from 2013-04-27 12:48 UT to 2013-04-27 22 : 09 UT (from ~5.1 h to ~ 5.4 h after the burst). The resulting spectrum ( S/N ~ 5) shows a feature less continuum light without any emission nor absorption line features in the wavelength range between 450 nm and 680 nm. [GCN OPS NOTE(30apr13): Per operator, I have corrected a mistake I made in assigning the affiliation for this submitor.]