[vsnet-grb-info 10837] GRB 110808A: VLT/X-shooter spectroscopy

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  12258
SUBJECT: GRB 110808A: VLT/X-shooter spectroscopy
DATE:    11/08/08 11:04:03 GMT
FROM:    Antonio Deugarte at IAA-CSIC  <deugarte at iaa.es>

A. de Ugarte Postigo, J. P. U. Fynbo (DARK/NBI), P. Jakobsson (U.
Iceland), B. Milvang-Jensen (ESO, DARK/NBI), A. Melandri (INAF-OABr), D.
Malesani (DARK/NBI), S. Schulze (U. Iceland), P. Goldoni (APC/Univ. Paris
7 and SAp/CEA), N. R. Tanvir (U. Leicester), H. Flores (Paris Obs.), K.
Wiersema (U. Leicester), S. Covino (INAF-OABr), L. Lovisi, B. Lanzoni (U.
Bologna) report on behalf of the X-shooter GRB collaboration:

We observed the afterglow of GRB 110808A (Stratta et al. GCN 12256) with
the ESO VLT equipped with the X-shooter spectrograph on 8 August 2011,
beginning 09:19 UT (3 hr after the GRB). The acquisition image shows the
UVOT optical afterglow candidate to have R ~ 21.2 mag.

We detect several emission lines, including [O II], [O III] and H-alpha at
a  common redshift of z = 1.348 (based on archival calibration frames). At
the same redshift we detect the Mg II doublet and Fe transitions in
absorption.

We acknowledge the support of the VLT staff, in particular Claudio Melo.