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T: Fachverband Teilchenphysik

T 54: Gammaastronomie II

T 54.1: Gruppenbericht

Mittwoch, 21. März 2018, 16:30–16:50, Philo-HS7

FACT - Results from Six Years of Monitoring at TeV Energies — •Daniela Dorner for the FACT collaboration — Universität Würzburg, Germany

The First G-APD Cherenkov Telescope, located on the Canary Island La Palma, is operational since more than six years. Thanks to the stable performance of its SiPM camera, it is ideally suited for long-term monitoring. With robotic operation, the data taking efficiency was maximized reaching up to 2400 h of physics data in 12 months. Monitoring a small sample of bright TeV sources, in total about 10000 hours of physics data have been collected. The bright blazars Mrk 421 and Mrk 501 have been observed for about 2000 hours each. In 2012 and 2014, extreme outbursts have been observed from Mrk 501, and Mrk 421 showed a bright flare in 2013. Another blazar, 1ES 1959+650 showed an exceptional outburst in summer 2016 after having shown no enhanced activity for 14 years. Thanks to an automatic quick look analysis, FACT alerts the community about such events with low latency triggering valuable multi-wavelength observations. Since March 2014, more than 50 alerts and five astronomer's telegrams have been issued. Following an open data policy, the FACT Collaboration not only publishes the results of the quick look analysis online, but also provides a sample of high quality raw data to the community.

The presentation summarizes results from six years of blazar monitoring with FACT and coordinated multi-wavelength studies.