TITLE: GCN CIRCULAR NUMBER: 13458 SUBJECT: GRB 120712A Gemini-S redshift DATE: 12/07/13 01:17:34 GMT FROM: Nial Tanvir at U.Leicester N. R. Tanvir (U. Leicester), A. J. Levan (U. Warwick) and D. Krogsrud (Gemini) report on behalf of a larger collaboration: We observed the afterglow of GRB 120712A (Page et al. GCN 12454; using the GMOS-S spectrograph on Gemini-South in good conditions. Observations began at 2012-7-12 23:43 UT, about 10 hr post-burst. The spectrum reveals a clear Ly-a break, and many other absorption features. A provisional reduction gives a redshift of z=4.15, although this figure will be refined with better calibration.