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T: Fachverband Teilchenphysik

T 36: Gamma Astronomy II

T 36.3: Vortrag

Dienstag, 21. März 2023, 17:30–17:45, POT/0151

LST-1 observations of BL Lacertae flare in 2021 — •seiya nozaki¹, katsuaki asano², gabriel emery³, juan escudero pedrosa⁴, and chaitanya priyadarshi⁵ for the CTA collaboration — ¹Max Planck Institute for Physics, Munich, Germany — ²Institute for Cosmic Ray Research, Chiba, Japan — ³University of Geneva - DPNC, Geneva, Switzerland — ⁴Institute of Astrophysics of Andalusia - CSIC, Granada, Spain — ⁵Institute for High Energy Physics, Barcelona, Spain

The Cherenkov Telescope Array (CTA) will be the next-generation very-high-energy gamma-ray observatory. Three different sizes of telescopes are planned to be built to cover a wide energy range. The Large-Sized Telescope (LST), with a 23-m diameter mirror dish, is designed to detect low-energy gamma-ray signals upwards from a few tens of GeV. This energy range plays a crucial role in the exploration of the extragalactic objects, especially transient sources. The first prototype of LST (LST-1) located at La Palma (Canary Islands, Spain) has been in a commissioning phase since 2018 and already started to observe gamma-ray sources. In 2021, LST-1 observed BL Lacertae and detected enormous gamma-ray flares with a large flux variability. In this contribution, we will report the results of LST-1 observations of BL Lacertae in 2021, including the energy spectrum down to around the energy threshold of LST-1 and sub-hour-scale fast flux variability.