Search
Results
-
FACT-Tools - Processing High-Volume Telescope Data
(2019)Astronomical Society of the Pacific Conference Series ~ Proceedings of the 26th Annual Conference for Astronomical Data Analysis Software and Systems (ADASS XXVI)Conference Paper -
Single Photon Extraction for FACT’s SiPMs allows for Novel IACT Event Representation
(2018)PoS: Proceedings of Science ~ Proceedings of the 35th International Cosmic Ray Conference (ICRC 2017)Imaging Atmospheric Cherenkov Telescopes provide large gamma-ray collection areas > 10^4 m^2 and successfully probe the high energetic gamma-ray sky by observing extensive air showers during the night. The First G-APD Cherenkov Telescope (FACT) explores silicon based photoelectric converters (called G-APDs or SiPMs) which provide more observation time with strong moonlight, a more stable photon gain over years of observations, and ...Conference Paper -
FACT – Performance of the First Cherenkov Telescope Observing with SiPMs
(2018)PoS: Proceedings of Science ~ Proceedings of the 35th International Cosmic Ray Conference (ICRC 2017)The First G-APD Cherenkov Telescope (FACT) is pioneering the usage of silicon photo mul- tipliers (SiPMs also known as G-APDs) for the imaging atmospheric Cherenkov technique. It is located at the Observatorio Roque de los Muchachos on the Canary island of La Palma. Since first light in October 2011, it is monitoring bright TeV blazars in the northern sky. By now, FACT is the only imaging atmospheric Cherenkov telescope operating with S ...Conference Paper -
Higher Order Temperature Dependence of SiPM used in FACT
(2018)PoS: Proceedings of Science ~ Proceedings of the 35th International Cosmic Ray Conference (ICRC 2017)Solid state photosensors, usually called SiPM or G-APD, seem ideal devices to be used in Imaging Atmospheric Cherenkov Telescopes (IACT). Nevertheless, their temperature dependence poses questions about their suitability in the harsh environment intrinsic to the operation of IACTs. While detailed measurements in the laboratory are possible with some sample sensors, limited data about the performance and uniformity of large samples exist. ...Conference Paper -
FACT - Searching for periodicity in five-year light-curves of Active Galactic Nuclei
(2018)PoS: Proceedings of ScienceThe First G-APD Cherenkov Telescope (FACT) has been monitoring Active Galactic Nuclei (AGN) for the past five years. The use of robust silicon photomultipliers (SiPMs) allows for a continuous, unbiased sampling even during bright-light conditions. This dataset promises insights into the core regions of AGN by investigating the periodicity of the sources. Periodic changes in the flux could indicate a binary nature of the supermassive black ...Conference Paper -
Using Charged Cosmic Ray Particles to Monitor the Data Quality of FACT
(2018)PoS: Proceedings of Science ~ ICRC2017 proceedingsImaging Air Cherenkov Telescopes (IACT) measure the faint flashes of Cherenkov light emitted by air-showers that are produced when charged particles or gamma rays hit the atmosphere. Therefore, the atmosphere above the IACT is an integral part of the detector. Variations in the performance of the IACT itself, but also changes in the absorption and scattering of Cherenkov light due to clouds or dust affect the interpretation of measured ...Conference Paper -
FACT - Highlights from more than Five Years of Unbiased Monitoring at TeV Energies
(2018)PoS: Proceedings of ScienceThe First G-APD Cherenkov Telescope (FACT) is monitoring blazars at TeV energies. Thanks to the observing strategy, the automatic operation and the usage of solid state photosensors (SiPM, aka G-APDs), the duty cycle of the instrument has been maximized and the observational gaps minimized. This provides a unprecedented, unbiased data sample of almost 9000~hours of data of which 2375 hours were taken in 2016. An automatic quick look ...Conference Paper -
FACT: status and experience from four years of operation of the First G-APD Cherenkov Telescope
(2016)Proceedings of SPIE ~ Ground-Based and Airborne Telescopes VIConference Paper -
Real Time Streaming Analysis of IACT Data
(2019)Astronomical Society of the Pacific Conference Series ~ Proceedings of the 26th Annual Conference for Astronomical Data Analysis Software and Systems (ADASS XXVI)Conference Paper -
FACT - Highlights from more than Seven Years of Unbiased Monitoring at TeV Energies
(2019)PoS: Proceedings of Science ~ 36th International Cosmic Ray Conference (ICRC 2019) - GRI - Gamma Ray IndirectThe First G-APD Cherenkov Telescope (FACT) has been monitoring TeV-blazars since October 2011. Thanks to its unbiased observing strategy, the robotic operation and the usage of solid state photosensors (SiPM, aka G-APDs), the instrument's duty cycle has been maximized and the observational gaps minimized, providing an unprecedented data sample of more than 13'800 hours of physics data, of which more than 2600 hours were taken in the past ...Conference Paper