[vsnet-grb-info 4511] GRB 070411: OA redshift

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  6283
SUBJECT: GRB 070411: OA redshift
DATE:    07/04/12 09:22:01 GMT
FROM:    Pall Jakobsson at U Hertfordshire  <P.Jakobsson at herts.ac.uk>

Pall Jakobsson (U. Hertfordshire), Daniele Malesani,
Christina C. Thoene, Johan P. U. Fynbo, Jens Hjorth
(DARK, NBI), Andreas O. Jaunsen (U. Oslo),
Michael I. Andersen (Potsdam) and Paul M. Vreeswijk
(ESO), report on behalf of a larger collaboration:

Using FORS2 on the Very Large Telescope, we have obtained
2*10 min spectra (grism 1400V) of the optical afterglow
of GRB 070411 (Moretti et al., GCN 6267) on April 12.05.
The combined spectrum displays several absorption features,
including Ly-alpha, C II, C II*, Si II, Si IV and Fe II,
corresponding to a redshift of z = 2.954 (based on a
preliminary wavelength calibration).

We thank the Paranal staff for excellent support,
especially Leo Vanzi and Thomas Rivinius.