D. Fugazza, P. D'Avanzo (INAF/OABr), D. Malesani (SISSA/ISAS), M. Della
Valle (INAF/OAA), N. Masetti, E. Palazzi (INAF/IASF Bo), E. Pian
(INAF/OATs), L.A. Antonelli, V. D'Elia, F. Fiore, S. Piranomonte, L.
Stella (INAF/OAR), S. Campana, G. Chincarini, S. Covino, G. Tagliaferri
(INAF/OABr), L. Di Fabrizio (INAF/TNG) report:
We observed the optical counterpart of GRB 060218 (Moretti et al., GCN
4775; Marshall et al., GCN 4779; Quimby et al., GCN 4782) with the 3.6m
TNG telescope located at the Canary Islands.
Spectroscopy in the range 4000-8000 AA reveals a blue continuum with
prominent star-forming emission features (Mirabal & Halpern, GCN 4792;
Masetti et al., GCN 4803).
A weak, broad bump is seen at ~5000 A, which is consistent with the peak
of a broad-lined SN like SN\1998bw (see also Masetti et al., GCN 4803;
Soderberg et al., GCN 4804). The overall observed shape would imply a
roughly equal contribution from the afterglow and the SN.
This message can be cited.