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Aliu, E; Anderhub, H; Antoranz, P; Armada, A; Asensio, M; Baixeras, C; Barrio, J. A; Bartko, H; Bastieri, D; Bednarek, W; Berger, K; Bigongiari, C; Biland, A; Bisesi, E; Bock, R. K; Bretz, T; Britvitch, I; Camara, M; Coarasa, J. A; Contreras, J. L; Cortina, J; Danielyan, V; De Angelis, A; de los Reyes, R; De Lotto, B; Domingo-Santamaría, E; Dorner, D; Errando, M; Ferenc, D; Fernández, E; Firpo, R; Font, L; Garczarczyk, M; Gaug, M; Gebauer, J; Giller, M; Goebel, F; Hakobyan, D; Höhne, D; Hose, J; Jacon, P; Kalekin, O; Kranich, D; Liebing, P; Lindfors, E; López, J; Lucarelli, F; Majumdar, P; Mannheim, K; Mariotti, M; Martínez, M; Mase, K; Merck, C; Merck, M; 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; Peruzzo, L; Prandini, E; Rico, J; Riegel, B; Rossato, G; Rügamer, S; Saggion, A; Sánchez, A; Sartori, P; Scalzotto, V; Schmitt, R; Schweizer, T; Shayduk, M; Shinozaki, K; Sidro, N; Sobczynska, D; Stamerra, A; Stark, L; Takalo, L; Temnikov, P; Tescaro, D; Teshima, M; Tonello, N; Torres, A; Torres, D. F; Vankov, H; Vitale, V; Wagner, R. M; Wibig, T; Wittek, W; Zapatero, J
The Astrophysical journal, 03/2006, Volume: 639, Issue: 2Journal Article
The MAGIC Cerenkov telescope has observed very high energy (VHE) g-ray emission from the active galactic nucleus 1ES 1959+650 during 6 hr in 2004 September and October. The observations were carried out alternating with observations of the Crab Nebula, whose data were used as a reference source for optimizing g -ray/hadron separation and for flux comparison. The data analysis shows VHE g-ray emission of 1ES 1959+650 with 68 s significance, at a time of low activity in both optical and X-ray wavelengths. An integral flux above 6180 GeV of about 20% that of the Crab Nebula was obtained. The light curve, sampled over 7 days, shows no significant variations. The differential energy spectrum between 180 GeV and 2 TeV can be fitted with a power-law of index -2.72 c 0.14. The spectrum is consistent with the slightly steeper spectrum seen by HEGRA at higher energies, also during periods of low X-ray activity.
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