Abstract
The First G-APD Cherenkov Telescope (FACT), located on the Canary Island of La Palma, has been taking data since October 2011. FACT has been optimized for longterm monitoring of bright TeV blazars, to study their variability time scales and flare probability. G-APD photo-sensors allow for observations even under strong moonlight conditions, and the telescope can be operated remotely. The monitoring strategy of FACT is discussed and preliminary results of the flare of Mrk501 in June 2012 are shown.
Highlights
The First Geigermode Avalanche Photodiodes (G-APDs) Cherenkov Telescope (FACT) is situated on the Canary Island of La Palma at the Observatorio del Roque de los Muchachos at 2200 meters above sea level
First G-APD Cherenkov Telescope (FACT) has been optimized for longterm monitoring of bright TeV blazars, to study their variability time scales and flare probability
G-APD photo-sensors allow for observations even under strong moonlight conditions, and the telescope can be operated remotely
Summary
The First G-APD Cherenkov Telescope (FACT) is situated on the Canary Island of La Palma at the Observatorio del Roque de los Muchachos at 2200 meters above sea level. For the experiment, the former mount of the HEGRA CT3 telescope was refurbished. The camera consists of 1440 pixels, each with an opening angle of 0.11 degrees This results in a total field-of-view of 4.5 degrees. A great advantage of G-APDs is their ability to operate even under strong moonlight conditions. This significantly increases the possible duty cycle of the telescope. The FACT collaboration was founded in 2008 with the aim to examine these silicon photodectectors for use in Cherenkov telescopes and to monitor bright TeV blazars in the longterm
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