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Paiano (o), Spain (b) Universita di Udine, Spain (h) Inst. de Astrofisica de Canarias, Spain (i) University of Lodz, Spain (n) Institute of Space Sciences, Spain (o) Universita di Padova, Spain (r) Universitat de Barcelona, Spain (s) Japanese MAGIC Consortium, Spain (x) Universita dell Insubria, S. R. Gozzini (j), S. Rugamer (l), S. Schmidl (f), Switzerland (ac) Now at Institut fur Astro- und Teilchenphysik, Switzerland (l) Universitat Wurzburg, T. Bretz (l, Tenerife, T. Saito (s), T. Schweizer (f), T. Steinbring (l), T. Terzic (e), T. Toyama (f), Tuorla Observatory, Turku, U. Menzel (f), Universitat Autonoma de Barcelona, University of Maryland, University of Oulu, University of Rijeka, University of Split, University of Turku, USA, USA (ab) now at Ecole polytechnique federale de Lausanne (EPFL), V. Kadenius (t), V. Neustroev (t), V. Scalzotto (o), V. Scapin (g), W. Bednarek (i), W. Haberer (f), W. Idec (i), W. Rhode (p), X. Paredes-Fortuny (r), Y. Hanabata (s), Y. 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