[vsnet-grb-info 7322] GRB 090205: VLT spectroscopic redshift
GCN Circulars
gcncirc at capella.gsfc.nasa.gov
Fri Feb 6 17:57:45 JST 2009
TITLE: GCN CIRCULAR
NUMBER: 8889
SUBJECT: GRB 090205: VLT spectroscopic redshift
DATE: 09/02/06 08:57:35 GMT
FROM: Paolo D'Avanzo at INAF-OAB <paolo.davanzo at brera.inaf.it>
C. C. Thoene, D. Fugazza, P. D'Avanzo (INAF-OAB), V. D'Elia, S.
Piranomonte (INAF-OAR), R. Salvaterra, S. Covino, S. Campana (INAF-OAB),
G. Chincarini (Univ. Bicocca) report, on behalf of the MISTICI
collaboration:
We observed the optical afterglow of GRB 090205 (D'Avanzo et al. GCN
8887; Kruehler & Greiner GCN 8888) with the ESO VLT about 9.0 hours
after the burst with the FORS1 camera in spectroscopic mode. We took a
20 min spectrum covering the range 4000-9000 Angstrom (based on a
preliminary wavelength calibration) with a resolution of R=440.
We detect a broad absorption feature around lambda_obs = 6800 Angstrom.
Interpreting this feature as Ly-alpha absorption the inferred redshift
is z = 4.6 in agreement with the photometric redshift reported by
Kruehler & Greiner (GCN 8888).
We acknowledge excellent support from the ESO staff, in particular G.
James and J. Smoker.
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