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FACT - The First G-APD Cherenkov Telescope: Status and Results

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arxiv 1308.1512 v1 pith:TD2I3VGN submitted 2013-08-07 astro-ph.IM physics.ins-det

FACT - The First G-APD Cherenkov Telescope: Status and Results

T.Bretz , H. Anderhub , M. Backes , A. Biland , V. Boccone , I. Braun , T. Bretz , J. Buss
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F. Cadoux V. Commichau L. Djambazov D. Dorner S. Einecke D. Eisenacher A. Gendotti O. Grimm H. von Gunten C. Haller D. Hildebrand U. Horisberger B. Huber K.-S. Kim M. L. Knoetig J.-H. Koehne T. Kraehenbuehl B. Krumm M. Lee E. Lorenz W. Lustermann E. Lyard K. Mannheim M. Meharga K. Meier T. Montaruli D. Neise F. Nessi-Tedaldi A.-K. Overkemping A. Paravac F. Pauss D. Renker W. Rhode M. Ribordy U. Roeser J.-P. Stucki J. Schneider T. Steinbring F. Temme J. Thaele S. Tobler G. Viertel P. Vogler R. Walter K. Warda Q. Weitzel M. Zaenglein (for the FACT Collaboration)
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The First G-APD Cherenkov telescope (FACT) is the first telescope using silicon photon detectors (G-APD aka. SiPM). It is built on the mount of the HEGRA CT3 telescope, still located at the Observatorio del Roque de los Muchachos, and it is successfully in operation since Oct. 2011. The use of Silicon devices promises a higher photon detection efficiency, more robustness and higher precision than photo-multiplier tubes. The FACT collaboration is investigating with which precision these devices can be operated on the long-term. Currently, the telescope is successfully operated from remote and robotic operation is under development. During the past months of operation, the foreseen monitoring program of the brightest known TeV blazars has been carried out, and first physics results have been obtained including a strong flare of Mrk501. An instantaneous flare alert system is already in a testing phase. This presentation will give an overview of the project and summarize its goals, status and first results.

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