TITLE: GCN CIRCULAR NUMBER: 8542 SUBJECT: GRB 081121: Magellan Redshift DATE: 08/11/22 05:21:25 GMT FROM: Edo Berger at Harvard E. Berger (Harvard) and M. Rauch (Carnegie) report: "We obtained spectroscopic observations of the optical afterglow of GRB 081121 (GCNs 8536,8537) with the LDSS3 spectrograph on the Magellan/Clay 6.5-m telescope starting on 2008 Nov 22.16 UT. The spectra cover the wavelength range 3800-6500A. We detect Ly-alpha absorption, as well as aborption features corresponding to SiII, CII, SiIV, CIV, FeII, and AlII at a redshift of z=2.512, which we consider the redshift of the burst. Further analysis is in progress."