[vsnet-grb-info 2109] GRB 050908: spectroscopic redshift

[GCN Circulars]

TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  3948
SUBJECT: GRB 050908: spectroscopic redshift
DATE:    05/09/08 09:30:59 GMT
FROM:    Daniele Malesani at SISSA-ISAS,Trieste,Italy  <malesani at sissa.it>

D. Fugazza (INAF/OABr), F. Fiore (INAF/OARm), N. Patat, C. Ledoux (ESO), 
P. D'Avanzo (INAF/OABr), L.A. Antonelli (INAF/OARm), G. Chincarini 
(INAF/OABr & Univ. Milano-Bicocca), D. Malesani (SISSA/ISAS), S. Covino, 
G. Tagliaferri (INAF/OABr), S. Piranomonte and L. Stella (INAF/OArm), 
report on behalf of the MISTICI collaboration:

We observed the optical afterglow (Torii, GCN 3943; Cenko, Fox & Berger, 
GCN 3944) of GRB 050908 (Goad et al., GCNs 3942, 3946) with the ESO-VLT 
UT2, equipped with the FORS1 instrument. Spectroscopy was performed with 
the grism 300V, covering the wavelength range 4500-8500 AA. Twenty 
minutes of exposure were acquired starting on 2005 Sep 8, 07:19 UT. Data 
reduction was performed using archivial calibration files, so that small 
systematic uncertainties may be present in our analysis.

Based on the detection of Lyalpha, SiIV1309,1402, CIV1548,1550, 
SiII1206, and the Lyman limit, we measure a redshift z = 3.350 +- 0.005.

Further analysis is in progress and results will be communicated later.

We acknowledge the outstanding support received from the ESO staff.

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