[vsnet-grb-info 3701] VLT redshift of GRB 060906

[GCN Circulars]

TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  5535
SUBJECT: VLT redshift of GRB 060906
DATE:    06/09/06 18:17:49 GMT
FROM:    Paul Vreeswijk at ESO  <pvreeswi at eso.org>

Paul Vreeswijk (ESO/Cerro Calan), Pall Jakobsson (Hertfordshire),
Cedric Ledoux (ESO), Christina Thoene, Johan Fynbo (DARK) report on
behalf of a larger collaboration:

We observed the optical afterglow (Cenko et al., GCN 5529) of GRB
060906 detected by Swift (Racusin et al., GCN 5528) with ESO's Very
Large Telescope UT2 (Kueyen) at Paranal, Chile. One single FORS1
spectrum with an exposure time of 10min. was taken in twilight, with
the 300V grism and a 1" slit, providing a wavelength coverage of
3800-8900 at a resolution of 12 A.

We detect a damped Ly alpha line and various other absorption features
such as Si II, Si II*, O I, C II, Si IV at a redshift of z=3.685.

It's a pleasure to thank the excellent support of the Paranal staff,
and in particular that of Claudio Melo, Chris Lidman and Linda
Schmidtobreick.