Mainz 2014 – scientific programme

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T: Fachverband Teilchenphysik

T 73: Gammaastronomie 4

T 73.1: Group Report

Wednesday, March 26, 2014, 16:45–17:05, P2

FACT - Status and Results from 2.5 Years of Operation — •Daniela Dorner for the FACT collaboration — Universität Würzburg, Deutschland

As from October 2011, the First G-APD Cherenkov Telescope (FACT) has been operational showing that silicon photo multipliers are a very promising alternative to photo multiplier tubes in Cherenkov telescope cameras. Showing no ageing when exposed to strong light, Geiger-mode avalanche photo diodes (G-APDs) are ideal devices for long-term monitoring enlarging the duty cycle by 70% compared to purely darktime observations. A consistent data quality is achieved thanks to the very stable gain of G-APDs which can be ensured by a feedback system measuring the temperature and currents in the camera and correcting the applied bias voltage for it. As well as long-term monitoring, another goal of FACT is robotic operation. Remote and automatic operation are currently ongoing.

Results from 2.5 years of monitoring of bright TeV blazars will be presented.