[vsnet-grb-info 13429] GRB 130604A: Gemini North Spectroscopy

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  14762
SUBJECT: GRB 130604A: Gemini North Spectroscopy
DATE:    13/06/04 16:07:17 GMT
FROM:    S. Bradley Cenko at Caltech  <cenko at srl.caltech.edu>

S. B. Cenko (GSFC), D. A Perley (Caltech), A. J. Levan (U. Warwick), and
A. Cucchiara (UCSC / Lick) report on behalf of a larger collaboration:

We have obtained optical spectra of the afterglow (Perley et al., GCN
14753) of GRB 130604A (Melandri et al., GCN 14752) with the Gemini
Multi-Object Spectrograph mounted on the 8 m Gemini North telescope.
Observations began at 8:16 UT on 2013 June 4 (~ 1.3 hr after the Swift
trigger) and cover the wavelength range from 4000 - 8000 A.

Superimposed on a faint continuum, we detect a single bright emission line
at an observed wavelength of ~ 7674.0 A.  There is some evidence the
emission line is spectrally resolved.  No other obvious features (in
emission or absorption) are detected over our wavelength range.  If we
assume this feature corresponds to [O II], this implies a redshift of z =
1.06 for GRB 130604A.