Dortmund 2021 – scientific programme

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T: Fachverband Teilchenphysik

T 83: Gamma astronomy II

T 83.1: Group Report

Thursday, March 18, 2021, 16:00–16:20, Th

FACT - Highlights from Unbiased Monitoring at Very High Energies — •Daniela Dorner¹ and Thomas Bretz^2,3 for the FACT collaboration — ¹Universität Würzburg, Germany — ²ETH Zürich, Schweiz — ³RWTH Aachen, Germany

The First G-APD Cherenkov Telescope (FACT) has been monitoring bright sources at TeV energies for more than eight years, collecting a total of more than 14700 hours of physics data. The duty cycle is maximized and gaps in the light curves are minimized using semiconductor photosensors. In combination with an unbiased observing strategy, this yields an unprecedented data sample and allows for systematic studies of source variability. In addition, many multi-wavelength observations are triggered or carried out in the context of multi-instrument campaigns. Those are crucial to interpret the origin of the TeV gamma-ray emission. The presentation will summarize results from the past years on the blazars Mrk 501, Mrk 421, 1ES 1959+650 and 1ES 2344+514.