[vsnet-grb-info 3679] GRB 060904B: VLT redshift

[GCN Circulars]

TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  5513
SUBJECT: GRB 060904B: VLT redshift
DATE:    06/09/04 09:33:08 GMT
FROM:    Daniele Malesani at SISSA-ISAS,Trieste,Italy  <malesani at sissa.it>

D. Fugazza, P. D'Avanzo (INAF/OABr), D. Malesani (SISSA), G. Tagliaferri 
(INAF/OABr), G. Chincarini (Univ. Milano-Bicocca), L. Stella (INAF-OAR), 
J.P.U. Fynbo (DARK/NBI), C. Lidman, H. Sana (ESO), report on behalf of 
the MISTICI collaboration.

We observed the optical counterpart of GRB 060904B (Grupe et al., GCN 
5505; Rykoff et al., GCN 5504). Spectroscopy was performed with VLT + 
FORS1, with mean time Sep 4.318 UT (5.15 hr after the burst).

Several absorption features were clearly identified, among which FeII 
2586, FeII 2600, Mg II 2795,2803, Mg I 2852, Ca H&K 3933,3968. The 
inferred redshift is z = 0.703.

We acknowledge excellent support from the ESO staff.

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