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Lazzarotto, F. Longo, F. Perotti, F. Senziani, F. Verrecchia, G. Barbiellini, G. De Paris, G. Di Cocco, G. Novara, G. Pucella, G. Tosti, I. Donnarumma, I. Lapshov, L. Pacciani, L. Salotti, M. Feroci, M. Fiorini, M. Galli, M. Marisaldi, M. Prest, M. Rapisarda, M. Tavani, M.T. Fiocchi, M. Trifoglio, M. Villata, P. Caraveo, P. Giommi, P. Lipari, P. Picozza, P. Romano, P. Santolamazza, P. Soffitta, P. Ubertini, P.W. Cattaneo, S. Colafrancesco, S. Cutini, S. Mereghetti, S. Vercellone, T. Froysland, V. Cocco, V. Vittorini, W.P. Chen, Y. Evangelista","submitted_at":"2008-09-10T09:14:54Z","abstract_excerpt":"[Abridged] We report on a multiwavelength observation of the blazar 3C 454.3 (which we dubbed \"crazy diamond\") carried out on November 2007 by means of the astrophysical satellites AGILE, INTEGRAL, Swift, the WEBT Consortium, and the optical-NIR telescope REM. 3C 454.3 is detected at a $\\sim 19-\\sigma$ level during the 3-week observing period, with an average flux above 100 MeV of $F_{\\rm E>100MeV} = (170 \\pm 13) \\times 10^{-8}$ \\phcmsec. The gamma-ray spectrum can be fit with a single power-law with photon index $\\Gamma_{\\rm GRID} = 1.73 \\pm 0.16$ between 100 MeV and 1 GeV. 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