TITLE: GCN CIRCULAR NUMBER: 6470 SUBJECT: GRB 070529: Gemini Redshift DATE: 07/05/29 20:55:06 GMT FROM: Edo Berger at Carnegie Obs E. Berger (Carnegie), D. B. Fox and A. Cucchiara (Penn State) report: "Starting on 2007 May 29.59 UT we used GMOS on the Gemini North telescope to obtain a 900 sec spectrum of the afterglow of GRB 050729 (GCN 6466). The spectrum covers the wavelength range 5000-7900A. We find several strong absorption features corresponding to CIV, SiII, FeII, AlII, AlIII, etc. at a redshift of z=2.4996, which we identify as the redshift of the burst. At this redshift the observed fluence of 2.6e-6 erg/cm^2 (GCN 6468) translates to an isotropic equivalent energy of 3.8e52 erg."