A possible bright blue supernova in the afterglow of GRB 020305 J. Gorosabel, J. P. U. Fynbo, A. Fruchter, A. Levan, J. Hjorth, P. Nugent, A. J. Castro-Tirado, J. M. Castro Cerón, J. Rhoads, D. Bersier and I. Burud A&A, 437 2 (2005) 411-418 Published online: 21 June 2005 DOI: 10.1051/0004-6361:20052783