GCN Circular 1569
Subject
GRB021004: Absorption redshift
Date
2002-10-04T19:11:29Z (22 years ago)
From
Derek Fox at CIT <derekfox@astro.caltech.edu>
D.W. Fox, A.J. Barth, A.M. Soderberg, and P.A. Price (Caltech), with
H. Buttery (Cambridge) and T. Mauch (U. Sydney), report on behalf of
the Caltech-NRAO GRB Collaboration:
"We have observed the optical afterglow (Fox, GCN 1564) of GRB021004
(Shirasaki et al., GCN 1565) with the Siding Springs Observatory 2.3m
telescope and double-beam spectrograph. Reduction of a single 1200s
spectrum of the source reveals two distinct absorption-line systems,
with redshifts and line identifications as follows:
Line Rest Wavelength (Ang) Redshift
================================================
Mg II 2796.4, 2803.5 1.38
Mg II 2796.4, 2803.5 1.60
Mg I 2853.0 1.60
================================================
We have also identified Mn II and Fe II absorption features associated
with the z=1.60 system. We conclude that the redshift of GRB021004 is
greater than or equal to 1.60."