GCN Circular 4017

Pall Jakobsson, Johan P. U. Fynbo, (DARK, NBI), Danka Paraficz,
John Telting (NOT, La Palma), Brian L. Jensen, Jens Hjorth and
Jose Maria Castro Ceron (DARK, NBI) report:

Using ALFOSC on the Nordic Optical Telescope (NOT) we have obtained
spectra of the afterglow of GRB 050922C (GCN#4013 Norris et al.
[Swift], GCN#4012 Rykoff et al. [ROTSE-III], GCN#4015
Jakobsson et al. [NOT]) on 2005, Sep 22.9 UT.

We find several absorption features, including strong Lyman-alpha,
OI+SiII, CII, SiIV, CIV, AlII and AlIII, corresponding to a redshift
of z = 2.17+-0.03 (based on a preliminary wavelength calibration).
There is additional strong absorption, possibly corresponding to
Lyman-alpha at z = 2.05+-0.03.