GCN Circular 249
Subject
GRB 990123 NOT Spectrum Update
Date
1999-02-03T22:46:15Z (26 years ago)
From
Jens Hjorth at U.Copenhagen <jens@astro.ku.dk>
GRB 990123 NOT Spectrum Update
J. Hjorth (Copenhagen), M. I. Andersen (NOT), H. Pedersen (Copenhagen),
M. R. Zapatero-Osorio (IAC), E. Perez (IAA) and
A. J. Castro Tirado (LAEFF, IAA) report:
"We have conducted an improved analysis of the NOT spectra reported in
GCN #219. We detect several absorption lines in addition to the ones found
in the preliminary analysis, including Al III (185.5 and 186.3 nm). The
suggested assignment of two significant absorption lines with Zn II (202.6
and 206.3 nm) is uncertain. The resulting updated redshift is 1.598 +- 0.001.
The detection of an emission line associated with a system at z = 0.286 is not
confirmed. This considerably reduces the significance of the proposed line
system at z = 0.286. The significance of the line system at z = 0.21 is
unchanged and its reality remains uncertain. These findings are consistent
with the Keck results (IAUC #7096; GCN #223; GCN #235). The orientation of the
slit during the observations was along the parallactic angle (roughly E-W) and
covered the galaxy ~10" to the W of GRB 990123. The redshift of this galaxy is
0.278 +- 0.001 based on Ca II K and H (393.3 nm and 396.9 nm), G band
(400.3 nm) and Mgb (517.4 nm)."