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RE23/CTA-LST Papers

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Test results of the optical calibration system for the Large Sized Telescope camera /RE23/CTA-LST collaboration
In 2018 the Large Sized Telescope (LST-1) prototype, designed to be the lowest energy detector for the Cherenkov Telescope Array Observatory, was inaugurated at the Observatorio de Roque de Los Muchachos in La Palma, Canary Island and today three more are under construction, LST2–4 . The LST camera, with 1855 photomultipliers (PMTs), requires precise and regular calibration. [...]
CERN-RE23-2024-003.- Geneva : CERN, 2024 Calibox_paper_Iori_v1: PDF; Calibox_paper_iori_v2: PDF;

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Comparative study of unsupervised domain adaptation techniques applied to gamma-ray astronomy with the CTAO Large Sized Telescope-1 /RE23/CTA-LST Collaboration
Deep unsupervised domain adaptation is a widespread set of methods that leverages the knowledge of a labelled source domain to train a model to perform well on a related unlabelled target domain. They fall within the scope of the multitask learning paradigm, which aims to merge multiple single-task models into a unified architecture. [...]
CERN-RE23-2024-002.- Geneva : CERN, 2024 CVIU_2024_v0: PDF;

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RS Ophiuchi: the first galactic transient detected with the LST-1 /RE23/CTA-LST collaboration
Context. The recurrent nova RS Ophiuchi (RS Oph) underwent a nova explosion in August 2021. [...]
CERN-RE23-2024-001.- Geneva : CERN, 2024 RS_Oph_LST_V101: PDF; RS_Oph_LST_v20: PDF;

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Measurement of the atmospheric absorption profile with isotropic background events /RE23/CTA-LST collaboration
Atmospheric Cherenkov telescopes rely on the Earth’s atmosphere as part of the detector. The presence of clouds affects obser- vations and can introduce biases if not corrected for. [...]
CERN-RE23-2023-006.- Geneva : CERN, 2023 Felix_Comments_v02: TXT; Proton_Draft_v02: PDF; Proton_clouds_v03_to_v04: PDF; Proton_clouds_v04: PDF; internal_reviewers_proton_cloud: PDF;

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A detailed study of the Very-High-Energy Crab Pulsar emission with the LST-1 telescope /RE23/CTA-LST collaboration
Context. There are currently three pulsars firmly detected by Imaging Atmospheric Cherenkov Telescopes (IACTs), two of them reaching the TeV range, challenging standard models of high energy emission of pulsars. [...]
CERN-RE23-2023-005.- Geneva : CERN, 2023 CrabPulsar_paper_LST1_v3: PDF; CrabPulsar_paper_LST1_v4: PDF; CrabPulsar_paper_LST1_v5: PDF; CrabPulsar_paper_LST1_v6: PDF; CrabPulsar_paper_LST1_v6_commentsDM: PDF; CrabPulsar_paper_LST1_v7: PDF; CrabPulsar_paper_LST1_v8: PDF; CrabPulsar_paper_LST1_v8-1: PDF; CrabPulsar_paper_LST1_v9: PDF; CrabPulsar_paper_LST1_v12: PDF; CrabPulsar_paper_LST1_v13_2: PDF; Crab_Pulsar_v0: PDF; Crab_Pulsar_v1: PDF; Crab_Pulsar_v2: PDF; GC_Response_v0: PDF; V0_GC_Comments: PDF; additional_figure_1: PNG; additional_figure_2: PNG; additional_figure_3: PNG; additional_figure_4: PNG; additional_figure_5: PNG; additional_figure_6: PNG; fwhm_energy_corr: PDF;

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A new method for space-time reconstruction of images of gamma-ray telescopes applied to the LST-1 of CTA / Emery, Gabriel (Universite de Geneve (CH)) /RE23/CTA-LST collaboration
Context. Imaging Atmospheric Cherenkov Telescopes (IACTs) are used to observe Very High Energy photons from the ground. [...]
CERN-RE23-2023-004.- Geneva : CERN, 2023 LHfit_paper_AjP_preprint2_style_v3: PDF; LHfit_paper_AjP_preprint2_style_v4: PDF; LHfit_paper_AjP_preprint2_style_v5: PDF; LHfit_paper_AjP_preprint2_style_v6: PDF; LHfit_paper_AjP_preprint2_style_v8: PDF; LST LH Fit v1: PDF; LST_LH_Fit_v2: PDF;

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Development and Quality Control of PMT Modules for the Large-Sized Telescopes of the Cherenkov Telescope Array /RE23/CTA-LST collaboration
The cameras of the Large-Sized Telescopes (LSTs) of the Cherenkov Telescope Array (CTA) consist of 1855 pixels that are divided into 265 high-performance photomultiplier tube (PMT) modules. Each module is composed of a seven-light-guide plate, seven PMT units, a slow control board, and a readout board with a trigger mezzanine board. [...]
CERN-RE23-2023-003.- Geneva : CERN, 2023 LST_PMT_ModuleV5: PDF; LST_PMT_Module_v4: PDF;

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Cherenkov image correction method for cloud-affected observations /RE23/CTA-LST collaboration
The presence of clouds during observations with Imaging Atmospheric Cherenkov Telescopes can strongly affect the performance of the instrument due to additional light absorption. If not corrected for, it can lead to increased systematic errors in the measurements. [...]
CERN-RE23-2023-002.- Geneva : CERN, 2023 Cloud Correction v12: PDF; Diff v11 to v12: PDF; LST Cloud Paper v1: PDF; Response to IR v11: PDF;

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Performance of the joint LST-1 and MAGIC observations evaluated with Crab Nebula observations /RE23/CTA-LST collaboration
LST-1, the prototype of the Large-Sized Telescope for the upcoming Cherenkov Telescope Array Observatory is concluding its commissioning in Observatorio Roque de los Muchachos on the island of La Palma. The proximity of LST-1 to the MAGIC telescopes allows for common observations of the same gamma-ray events with both systems. [...]
CERN-RE23-2023-001.- Geneva : CERN, 2023 Diff of version v3.3 to v3.2: PDF; Difference between submitted to A&A and post response: PDF; Fulltext: PDF; LST+MAGIC Phase 1 Discussion: PDF; LST+MAGIC Response to AA refs: PDF; New version of the LST+MAGIC (v4.1) post ref comments: PDF; Version 3.3: PDF; response to Mykhailo: PDF; v3.1 of the MAGIC+LST Performance Paper: PDF;

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Star tracking for pointing determination of Imaging Atmospheric Cherenkov Telescopes. Application to the Large-Sized Telescope of the Cherenkov Telescope Array. / Dalchenko, Mykhailo (Universite de Geneve (CH)) /RE23/CTA-LST collaboration
We present a novel approach to the determination of the pointing of Imaging Atmospheric Cherenkov 6 Telescopes (IACTs) using the trajectories of the stars in their cameras’ field of view. The method 7 starts with the reconstruction of the star positions, taking into account the point spread function of 8 the telescope, to achieve satisfying reconstruction accuracy. [...]
CERN-RE23-2022-003.- Geneva : CERN, 2022 Fulltext: PDF;

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