[vsnet-grb-info 2683] GRB 060115: absorption redshift

[GCN Circulars]

TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  4520
SUBJECT: GRB 060115: absorption redshift
DATE:    06/01/16 11:12:43 GMT
FROM:    Daniele Malesani at SISSA-ISAS,Trieste,Italy  <malesani at sissa.it>

S. Piranomonte, V. D'Elia, F. Fiore (INAF/OAR), S. Covino, D. Fugazza 
(INAF/OABr), G. Chincarini (Univ. Milano-Bicocca), D. Malesani 
(SISSA/ISAS), P. D'Avanzo (INAF/OABr), L.A. Antonelli (INAF/OAR), C. 
Ledoux, A. Lopez, and D. Naef (ESO), report on behalf of the MISTICI 
collaboration:

We obtained medium-resolution spectra of the optical counterpart 
(Yanagisawa, Toda & Kawai, GCN 4510) of GRB 060115 (Tagliaferri et al., 
GCN 4509; Perri et al., GCN 4514; Barbier et al., GCN 4518). 
Observations were carried out with the ESO-VLT, equipped with the FORS1 
instrument and the grism 300V.

Preliminary analysis of two 30-min spectra taken starting on Jan 16.044 
UT shows a DLA at ~5500 A (observer frame), together with a rich 
absorption system which includes NV(1238,1242), SiIV(1393,1402), and 
CIV(1548,1550). The inferred redshift is z = 3.53.

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