GCN Circular 10350
Subject
GRB091109A: VLT/FORS2 spectroscopic redshift
Date
2010-01-19T22:11:33Z (15 years ago)
From
Arne Rau at MPE <arau@mpe.mpg.de>
Arne Rau (MPE Garching), Johan Fynbo (DARK), and Jochen Greiner (MPE
Garching):
"We report on additional analysis of our VLT/FORS2 spectrum of the
optical afterglow of GRB 091109A (Oates et al., GCN #10138, Guidorzi et
al. GCN#10142, Oates GCN#10143, Afonso et al., GCN #10158 ).
A careful search revealed absorption lines at 6227, 6308, and 6321
Angstroem which we identify with SiII and the CIV doublet a common
redshift of z=3.076 +/- 0.002. Lyman-alpha absorption at this redshift
is located shortwards of the blue wavelength cut-off and the earlier
reported tentative detection at 5700A (Afonso et al., GCN #10158) is not
confirmed."