TITLE: GCN CIRCULAR NUMBER: 6166 SUBJECT: GRB 060605 new redshift DATE: 07/03/02 10:53:40 GMT FROM: Patrizia Ferrero at TLS Tautenburg S. Savaglio, MPE Garching,  E. Palazzi, INAF-IASF, Bologna, P. Ferrero & S. Klose, TLS Tautenburg, report: We have re-analyzed the spectrum of GRB 060605 afterglow taken with   the Integral Field Unit PMAS/PPak (Ferrero et al. 2006, GCN 5489). We   found a new strong SiIV absorption system with Ly-alpha, at redshift   z=3.78. This redshift is higher than the previous claimed redshift of   the GRB, z=3.711 (Ferrero et al. 2006, GCN 5489), which also show   SiIV absorption. These two SiIV  absorptions are separated by about   4000 km/s, and are similar to the double CIV absorption detected in   the afterglow of GRB 021004 (separation 2400 km/s; Savaglio et al.   2002, GCN 1633; Fiore et al. 2005, 624, 853) and GRB 030226   (separation 2400 km/s; Klose et al. 2004, AJ 128, 1942). A redshift z=3.8 for GRB 060605 was previously suggested by Peterson   et al. (GCN 5223). This message may be quoted.