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T: Fachverband Teilchenphysik
T 36: Gamma Astronomy II
T 36.3: Talk
Tuesday, March 21, 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.