TITLE: GCN CIRCULAR NUMBER: 12759 SUBJECT: GRB 111228A: MMT Redshift DATE: 11/12/29 08:16:27 GMT FROM: Edo Berger at Harvard J. Dittman, T. Laskar, and E. Berger (Harvard) report: "Starting on 2011 December 29.312 UT (15.7 hours after the burst) we used the Blue Channel spectrograph mounted on the MMT 6.5-m telescope to observe GRB111228A (GCN #12737). Our spectra cover the range 3400-8500A and reveal absorption lines of MgII and FeII at a common redshift of z=0.714, which we consider to be the redshift of GRB111228A. Additional observations are in progress."