[vsnet-grb-info 13936] GRB 130925A: VLT/X-shooter redshift

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  15250
SUBJECT: GRB 130925A: VLT/X-shooter redshift
DATE:    13/09/25 11:07:01 GMT
FROM:    Sylvio Klose at TLS Tautenburg  <klose at tls-tautenburg.de>

V. Sudilovsky, D.A. Kann, P. Schady (all MPE Garching), S. Klose (TLS 
Tautenburg), J. Greiner (MPE Garching), and T. Kruehler (ESO) report:

We observed the optical/NIR afterglow (Sudilovsky et al., GCN 15247) of 
GRB 130925A (Swift trigger 571830, Lien et al., GCN 15246) using ESO/VLT 
UT2 equipped with the X-shooter spectrograph.

Observations started at 07:42 UT on 2013-09-25, about 3.5 hr after the 
Swift trigger. A total exposure of 1.6 hr was obtained, covering the 
spectral range from 3000 to 20500 AA.

In the spectrum we detect emission lines, which we interpret as being due 
to [O II](3726,3729), H_beta, [O III](4959), [O III](5007) and H_alpha at 
a common redshift of z = 0.35, in agreement with Vreeswijk et al. (GCN 
15249).


We thank the Paranal staff for excellent support, in particular Linda 
Schmidtobreick, Jonathan Smoker and Patricia.