Karlsruhe 2024 – scientific programme

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T: Fachverband Teilchenphysik

T 60: Gamma astronomy 3

T 60.7: Talk

Wednesday, March 6, 2024, 17:30–17:45, Geb. 30.22: kl. HS A

FACT - Follow-up of Multi-Wavelength and Multi-Messenger Alerts — •Marcel Vorbrugg and Felix Pfeifle for the FACT collaboration — Julius-Maximilians-Universität Würzburg, Fakultät für Physik und Astronomie, Institut für Theoretische Physik und Astrophysik, Lehrstuhl für Astronomie, Emil-Fischer-Str. 31, D-97074 Würzburg, Germany

The First G-APD Cherenkov Telescope (FACT) is a gamma-ray observatory located on the Canary Island of La Palma. Employing Geiger-mode avalanche photodiodes (G-APDs), also known as SiPM, FACT monitors bright gamma-ray sources at TeV energies. The distinguishing aspect of its follow-up program lies in the pursuit of emission from potential gamma-ray candidates, utilizing skymaps for multi-messenger alerts. This program aims to automatically follow up on flare alerts from various channels including different sources types. Among others, FACT conducts target-of-opportunity observations of gamma-ray bursts and public neutrino alerts by IceCube. As the position uncertainty for these alerts tends to be large, a skymap analysis is crucial to the broader understanding of these high-energy phenomena. In this work, the outcomes and automatic observations of FACT's follow-up program will be analyzed. These alerts are essential for exploring possible emissions from unknown sources. The final goal is to search the aforementioned skymaps to potentially detect TeV emission from gamma-ray bursts or neutrino source candidates or set upper limits on their very-high-energy emission. An overview of results from 10 years of follow-ups will be given.

Keywords: IACT; Gamma Astronomy; Follow-up