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Aliu, E; Anderhub, H; Antoranz, P; Armada, A; Barrio, J. A; Bartko, H; Becker, J; Bednarek, W; Berger, K; Bigongiari, C; Biland, A; Bock, R. K; Bordas, P; Bosch-Ramon, V; Bretz, T; Camara, M; Carmona, E; 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; Firpo, R; Flix, J; Fonseca, M. V; Fuchs, M; Garczarczyk, M; Gaug, M; Giller, M; Hakobyan, D; Hengstebeck, T; Höhne, D; Hose, J; Hsu, C. C; Jacon, P; Kritzer, R; Laille, A; Liebing, P; Lindfors, E; Lombardi, S; Longo, F; López, J; López, M; Lorenz, E; Majumdar, P; Mannheim, K; Mansutti, O; Mariotti, M; Martínez, M; Mazin, D; Merck, C; Meyer, M; Miranda, J. M; Mizobuchi, S; Moralejo, A; Nilsson, K; Ninkovic, J; Oña-Wilhelmi, E; Otte, N; Paneque, D; Paoletti, R; Paredes, J. M; Pasanen, M; Pascoli, D; Pauss, F; Pegna, R; Peruzzo, L; Piccioli, A; Prandini, E; Raymers, A; Rhode, W; Ribó, M; Rissi, M; Rügamer, S; Sánchez, A; Scalzotto, V; Schmitt, R; Shayduk, M; Sidro, N; Sobczynska, D; Stamerra, A; Stark, L. S; Takalo, L; Temnikov, P; Teshima, M; Torres, D. F; Turini, N; Wittek, W; Zanin, R; Zapatero, J
The Astrophysical journal, 01/2007, Volume: 654, Issue: 2Journal Article
In 2005 and 2006, the MAGIC telescope observed very high energy gamma-ray emission from the distant BL Lac object PG 1553+113. The overall significance of the signal was 8.8 s for 18.8 hr of observation time. The light curve shows no significant flux variations on a daily timescale; the flux level during 2005 was, however, significantly higher compared to 2006. The differential energy spectrum between 690 and 500 GeV is well described by a power law with photon index = 4.2 c 0.3. The combined 2005 and 2006 energy spectrum provides an upper limit of z = 0.74 on the redshift of the object.
