TITLE: GCN CIRCULAR NUMBER: 14009 SUBJECT: GRB 121128A - Gemini North redshift DATE: 12/11/28 07:46:48 GMT FROM: Nial Tanvir at U.Leicester N. R. Tanvir (U. Leicester), A. J. Levan (U. Warwick), T. Matulonis (Gemini) report on behalf of a larger collaboration: We observed the counterpart of GRB 121128A (Oates et al. GCN 14007; Japelj et al. GCN 14008) with the GMOS-N spectrograph at Gemini-North, beginning at Nov 28 2012 06:06 UT, approximately 1hr post-burst. The afterglow is well detected and our provisional reduction shows a series of absorption lines of AlII, FeII, CIV, SiII, SiIV with a common redshift of z=2.20.