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  • Discovery of Very High Ener...
    Aliu, E; Anderhub, H; Antoranz, P; Armada, A; Asensio, M; Baixeras, C; Barrio, J. A; Bartelt, M; Bavikadi, S. R; Bednarek, W; Bigongiari, C; Biland, A; Bock, R. K; Bretz, T; Britvitch, I; Chilingarian, A; Ciprini, S; Coarasa, J. A; Commichau, S; Contreras, J. L; Curtef, V; Danielyan, V; Dazzi, F; De Angelis, A; de los Reyes, R; De Lotto, B; Domingo-Santamaría, E; Dorner, D; Errando, M; Fagiolini, M; Fernández, E; Firpo, R; Flix, J; Fonseca, M. V; Galante, N; Goebel, F; Hakobyan, D; Hayashida, M; Hengstebeck, T; Jacon, P; Kranich, D; Laille, A; Lenisa, T; Lindfors, E; Longo, F; López, J; López, M; Majumdar, P; Maneva, G; Mariotti, M; Martínez, M; Mase, K; Mazin, D; Meucci, M; Meyer, M; Miranda, J. M; Mirzoyan, R; Mizobuchi, S; Moralejo, A; Nilsson, K; Oña-Wilhelmi, E; Orduña, R; Otte, N; Paoletti, R; Pasanen, M; Pascoli, D; Pavel, N; Pegna, R; Persic, M; Peruzzo, L; Piccioli, A; Poller, M; Rico, J; Riegel, B; Rissi, M; Robert, A; Saggion, A; Sánchez, A; Sartori, P; Scalzotto, V; Schmitt, R; Schweizer, T; Shayduk, M; Shinozaki, K; Shore, S. N; Sidro, N; Sillanpää, A; Sobczyńska, D; Takalo, L; Temnikov, P; Tescaro, D; Tonello, N; Torres, A; Torres, D. F; Turini, N; Vankov, H; Vardanyan, A; Vitale, V; Wibig, T; Zapatero, J

    The Astrophysical journal, 05/2006, Volume: 642, Issue: 2
    Journal Article

    The MAGIC collaboration has studied the high-frequency-peaked BL Lac object 1ES 1218+30.4, at a redshift z = 0.182, using the MAGIC imaging air Cerenkov telescope located on the Canary Island of La Palma. A gamma-ray signal was observed with 6.4 s significance. The differential energy spectrum for an energy threshold of 120 GeV can be fitted by a simple power law, yielding F sub(E)(E) = (8.1 c 2.1) x 10 super(-7) E/(250 GeV) super(-3.0c0.4) TeV super(-1) m super(-2) s super(-1). During the 6 days of observation in 2005 January, no time variability on timescales of days was found within the statistical errors. The observed integral flux above 350 GeV is nearly a factor of 2 below the upper limit reported by the Whipple collaboration in 2003.