[vsnet-grb-info 13043] GRB 130418A: Redshift from 10.4m GTC

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  14380
SUBJECT: GRB 130418A: Redshift from 10.4m GTC
DATE:    13/04/18 22:49:12 GMT
FROM:    Antonio de Ugarte Postigo at IAA-CSIC  <deugarte at iaa.es>

A. de Ugarte Postigo (IAA-CSIC, DARK/NBI), C.C. Thoene (IAA-CSIC), 
J. Gorosabel (UPV/EHU, IAA-CSIC), R. Sanchez-Ramirez (IAA-CSIC), 
J. P. U. Fynbo (DARK/NBI), N. Tanvir (U. Leicester) and 
C.A. Alvarez Iglesias (GTC) report:

We have observed the afterglow of GRB 130418A (De Pasquale et al. GCN
14377) with the 10.4m GTC telescope starting at 21:45 UT (2.75 hr after the
burst). Observations consisted of 2x600s using the R1000B grating, with a 
resolution of R~1000 in the range 3600 - 7900 A.

The spectrum shows a high S/N trace, with very weak MgII features at a 
redshift of z = 1.218, which we identify as the redshift of the GRB.