[vsnet-grb-info 2190] GRB 050922C: Refined redshift

[GCN Circulars]

TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  4029
SUBJECT: GRB 050922C: Refined redshift
DATE:    05/09/23 15:39:42 GMT
FROM:    Pall Jakobsson at Niels Bohr Inst  <pallja at astro.ku.dk>

Páll Jakobsson, Johan P. U. Fynbo, (DARK, NBI), Danka Paraficz,
John Telting (NOT, La Palma), Brian L. Jensen, Jens Hjorth and
José María Castro Cerón (DARK, NBI) report:

Using new wavelength calibration files, we have refined the
GRB 050922C redshift obtained at the NOT (GCN 4017). Based on the
detection of Lyman-alpha, OI+SiII, CII, SiIV, FeII, AlII, SiII* and
SiII in absorption, we measure a redshift of z = 2.198+-0.001.

There is additional strong absorption, possibly corresponding to
Lyman-alpha at z = 2.07.