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Gianotti, F. Lazzarotto, F. Longo, F. Lucarelli, F. Perotti, F. Verrecchia, G. Barbiellini P. Caraveo, G. De Paris, G. Di Cocco, G. Piano, G. Pucella, H. A. Krimm, H. D. Aller, I. Donnarumma, I. Lapshov, L. O. Takalo, L. Pacciani, L. Salotti, M. A. Gurwell, M. C. Stroh, M. F. Aller, M. Feroci, M. Fiorini, M. Galli, M. Marisaldi, M. Pilia, M. Prest, M. Rapisarda, M. Sasada, M. Tavani, M. T. Fiocchi, M. Tornikoski, M. Trifoglio, M. Uemura, M. Villata, M. Yamanaka, P. A. Curran, P. Giommi, P. Leto, P. Lipari, P. Picozza, P. Santolamazza, P. Soffitta, P. W. Cattaneo, R. Itoh, S. Colafrancesco, S. Mereghetti, S. Sabatini, S. Vercellone, T. Sakamoto, V. Cocco, V. M. Larionov, V. Vittorini, Y. Evangelista","submitted_at":"2010-05-18T17:44:48Z","abstract_excerpt":"During the month of December, 2009 the blazar 3C 454.3 became the brightest gamma-ray source in the sky, reaching a peak flux F ~2000E-8 ph/cm2/s for E > 100 MeV. 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