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Di Cocco, G. Dubner, G. Piano, G. Pucella, I. Donnarumma, L. A. Antonelli, L. Pacciani, L. Salotti, M. Feroci, M. Fiorini, M. Galli, M. Giusti, M. Marisaldi, M. Pilia, M. Prest, M. Rapisarda, M. Tavani, M. Trifoglio, P. Caraveo, P. Giommi, P. Lipari, P. Picozza, P. Santolamazza, P. Soffitta, P. W. Cattaneo, S. Colafrancesco, S. Mereghetti, S. Sabatini, S. Vercellone, V. Vittorini, Y. Evangelista","submitted_at":"2010-09-28T11:52:33Z","abstract_excerpt":"Identification of gamma-ray-emitting Galactic sources is a long-standing problem in astrophysics. One such source, 1AGL J2022+4032, coincident with the interior of the radio shell of the supernova remnant Gamma Cygni (SNR G78.2+2.1) in the Cygnus Region, has recently been identified by Fermi as a gamma-ray pulsar, LAT PSR J2021+4026. We present long-term observations of 1AGL J2022+4032 with the AGILE gamma-ray telescope, measuring its flux and light curve. 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Argan, A. Bulgarelli, A. Ferrari, A. Giuliani, A. Morselli, A. Pellizzoni, A. Rappoldi, A. Trois, A. W. Chen, A. Zambra, C. Labanti, C. Pittori, D. Zanello, E. Costa, E. Del Monte, E.~Giacani, E. Moretti, E. Scalise, E. Striani, E. Vallazza, F. D'Ammando, F. Fuschino, F. Gianotti, F. Lazzarotto, F. Longo, F. Lucarelli, F. Perotti, F. Verrecchia, G. Barbiellini, G. De Paris, G. Di Cocco, G. Dubner, G. Piano, G. Pucella, I. Donnarumma, L. A. Antonelli, L. Pacciani, L. Salotti, M. Feroci, M. Fiorini, M. Galli, M. Giusti, M. Marisaldi, M. Pilia, M. Prest, M. Rapisarda, M. Tavani, M. Trifoglio, P. Caraveo, P. Giommi, P. Lipari, P. Picozza, P. Santolamazza, P. Soffitta, P. W. Cattaneo, S. Colafrancesco, S. Mereghetti, S. Sabatini, S. Vercellone, V. Vittorini, Y. Evangelista","submitted_at":"2010-09-28T11:52:33Z","abstract_excerpt":"Identification of gamma-ray-emitting Galactic sources is a long-standing problem in astrophysics. 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