TITLE:   GCN CIRCULAR
NUMBER:  14745
SUBJECT: GRB 130603B: Magellan redshift confirmation
DATE:    13/06/04 00:49:03 GMT
FROM:    Ryan Chornock at Harvard  <rchornock@cfa.harvard.edu>

R. J. Foley, R. Chornock, W. Fong, E. Berger (Harvard), S. Jha (Rutgers)
report:

We observed the field of the short-duration GRB 130603B (Melandri et
al., GCN 14735) with the Inamori Magellan Areal Camera and
Spectrograph (IMACS) mounted on the Magellan/Baade 6.5-m telescope
starting on 2013 Jun 04.004 UT (8.3-hr after the BAT trigger). In
600-s of r-band imaging, we detect the optical afterglow and host
galaxy (Levan et al., GCN 14742; de Ugarte Postigo et al., GCN
14743).  A 1200-s spectrum reveals several nebular emission lines from the host 
galaxy at a common redshift of 0.356, confirming the results of Thoene et al. 
(GCN 14744).