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GCN Circular 4807

Subject
GRB 060218: spectroscopic observations
Date
2006-02-21T19:21:07Z (18 years ago)
From
Daniele Malesani at SISSA-ISAS,Trieste,Italy <malesani@sissa.it>
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.

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