ar X iv : a st ro - p h / 07 02 00 8 v 3 5 D ec 2 00 7 Variable VHE γ - ray emission from Markarian 501

The blazar Markarian 501 (Mrk 501) was observed at energies above 0.10 TeV with the MAGIC telescope from May through July 2005. The high sensitivity of Universität Würzburg, D-97074 Würzburg, Germany IFAE, Edifici Cn., E-08193 Bellaterra (Barcelona), Spain ETH Zurich, CH-8093 Switzerland Universidad Complutense, E-28040 Madrid, Spain Universitat Autònoma de Barcelona, E-08193 Bellaterra, Spain Max-Planck-Institut für Physik, D-80805 München, Germany Università di Padova and INFN, I-35131 Padova, Italy Universität Dortmund, D-44227 Dortmund, Germany University of Lódź, PL-90236 Lodz, Poland Universitat de Barcelona, E-08028 Barcelona, Spain Yerevan Physics Institute, AM-375036 Yerevan, Armenia Tuorla Observatory, Turku University, FI-21500 Piikkiö, Finland Inst. de Astrofisica de Canarias, E-38200, La Laguna, Tenerife, Spain Università di Udine, and INFN Trieste, I-33100 Udine, Italy Università di Siena, and INFN Pisa, I-53100 Siena, Italy University of California, Davis, CA-95616-8677, USA Humboldt-Universität zu Berlin, D-12489 Berlin, Germany Inst. for Nucl. Research and Nucl. Energy, BG-1784 Sofia, Bulgaria INAF/Osservatorio Astronomico and INFN, I-34131 Trieste, Italy Università di Pisa, and INFN Pisa, I-56126 Pisa, Italy Institut de Cienciès de l’Espai, Campus UAB, E-08193 Bellaterra, Spain Depto. de Astrofsica, Universidad, E-38206 La Laguna, Tenerife, Spain Stanford Linear Accelerator Center, Stanford University, Menlo Park, CA 94025, USA Rudjer Boskovic Institute, Zagreb, Croatia INAF/Osservatorio Astronomico di Brera, Milano, Italy deceased correspondence: D.Paneque: [email protected] / [email protected]