[vsnet-grb-info 13180] GRB 130427A: Nishi-Harima Optical Spectroscopic Observations

[GCN Circulars]

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 Akira Arai Obs/U of Hyogo  <arai at nhao.jp>

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.