GCN Circular 6166
Subject
GRB 060605 new redshift
Date
2007-03-02T10:53:40Z (18 years ago)
From
Patrizia Ferrero at TLS Tautenburg <ferrero@tls-tautenburg.de>
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).
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