TITLE: GCN CIRCULAR NUMBER: 5958 SUBJECT: GRB 061222b: Magellan redshift DATE: 06/12/22 04:55:36 GMT FROM: Edo Berger at Carnegie Obs E. Berger (Carnegie) reports: "Spectroscopic observations of the afterglow (GCN 5956) of GRB 061222b (GCN 5957) with LDSS3 on Magellan reveal a strong continuum break at about 5340A corresponding to Ly-alpha at z~3.4."