[vsnet-grb-info 1910] GRB050802: Tentative absorption redshift

[GCN Circulars]

TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  3749
SUBJECT: GRB050802: Tentative absorption redshift
DATE:    05/08/03 20:25:25 GMT
FROM:    Johan U. Fynbo at U.Copenhagen  <jfynbo at astro.ku.dk>

Johan P. U. Fynbo, Jesper Sollerman, Brian L. Jensen, Jens Hjorth,
Darach Watson, José María Castro Cerón (DARK cosmology centre/Niels
Bohr Institute), Palle Moller (ESO), Thomas Augusteijn (Nordic Optical
Telescope), Javier Gorosabel (IAA-CSIC), Klaas Wiersema (Amsterdam)
report:

"Using ALFOSC on the Nordic Optical Telescope we have obtained
spectra of the afterglow of GRB 050802 (GCN 3734, 3739) on 2005,
August 2.9 UT. We detect several absorption features which we tentatively
identify as CIV and FeII lines, corresponding to a redshift of
z=1.71. This tentative redshift is at odds with the interpretation
of the UVOT results (GCN 3745). We encourage further observations."