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 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. This message can be cited.