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RE23/CTA-LST Papers

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2025-03-13
15:50
Detection of the distant Quasar OP 313 with the first Large-Sized Telescope of CTAO /RE23/CTA-LST collaboration
Context. Flat Spectrum Radio Quasars (FSRQs) often remain undetected at very-high-energy (VHE, E > 100 GeV) γ rays due to their typically soft spectra and large distance. [...]
CERN-RE23-2025-003.- Geneva : CERN, 2025 OP313_LST_Detection_v01: PDF; OP313_LST_Detection_v02_20250324: PDF; OP313_LST_Detection_v03_20250328: PDF;

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2025-02-27
09:50
VHE γ-ray observations of bright BL Lacs with the Large-Sized Telescope prototype /RE23/CTA-LST collaboration
Context. Cherenkov Telescope Array Observatory (CTAO) is the next-generation ground-based γ-ray observatory operating in the energy range from 20 GeV up to 300 TeV, with two sites in La Palma (Spain) and Paranal (Chile). [...]
CERN-RE23-2025-002.- Geneva : CERN, 2024 LST1_AGN_Zoo_Paper_review_v0: PDF; LST1_AGN_Zoo_Paper_review_v1: PDF; LST1_AGN_Zoo_Paper_review_v2: PDF; LST1_AGN_Zoo_Paper_review_v2_authors: PDF;

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2025-01-30
11:53
FPGA-Based RoCEv2-RDMA Readout Electronics for the CTAO-LST Advanced Camera / Marini, Filippo (Universita e INFN, Padova (IT)) /RE23/CTA-LST collaboration
CERN-RE23-2025-001.- Geneva : CERN, 2025 FPGA_Readout_Camera_v0: PDF; fmarini-fadc-rev1-2: PDF;

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2024-11-27
16:20
CTAO LST−1 observations of magnetar SGR 1935+2154: deep limits on sub-second bursts and persistent TeV emission /RE23/CTA-LST collaboration
Context. The Galactic magnetar SGR 1935+2154 has exhibited prolific high-energy (HE) bursting activity in recent years. [...]
CERN-RE23-2024-007.- Geneva : CERN, 2024 SGR1935_paper_v1: PDF; SGR1935_paper_v1_commentsFS: PDF; SGR1935_paper_v2: PDF; SGR1935_paper_v3: PDF; SGR1935_paper_v4: PDF;

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2024-11-27
16:14
GRB 221009A: Observations with LST-1 of CTAO and implications for structured jets in long gamma-ray bursts /RE23/CTA-LST collaboration
GRB 221009A was the brightest gamma-ray burst (GRB) observed to date. Extensive coverage of its afterglow emission across the electromagnetic spectrum was performed, providing the first strong evidence of a jet with nontrivial angular structure in a long GRB. [...]
CERN-RE23-2024-006.- Geneva : CERN, 2024 BOAT_v0: PDF; Fulltext: PDF; IR_EB: PDF; LST_GRB221009A_observations_vApJL_0: PDF; LST_GRB221009A_observations_vCollab_0-2: PDF; LST_GRB221009A_observations_vCollab_1: PDF; LST_GRB221009A_observations_vIR_1: PDF;

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2024-11-07
09:59
Constraining the TeV gamma-ray emission of SN 2024bch: a possible type IIn-L from a RSG progenitor /RE23/CTA-LST collaboration
We present very-high-energy, optical photometry and spectroscopic observations of SN 2024bch. We use gamma-ray observations performed with the first CTAO Large-Sized Telescope (LST-1) and optical observations with the Liverpool Telescope (LT), combined with data from public repositories to evaluate general properties of the event and of the progenitor star. [...]
CERN-RE23-2024-005.- Geneva : CERN, 2024 Fulltext: PDF; SN2024bch_v1: PDF; SN2024bch_v2: PDF; SN2024bch_v3-1-1: PDF; SN2024bch_v4: PDF;

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2024-10-30
19:03
Detection of the Geminga pulsar at energies down to 20 GeV with the LST-1 of CTAO /RE23/CTA-LST collaboration
Context. Geminga is the third gamma-ray pulsar detected at a significance level above 5σ by Imaging Atmospheric Cherenkov Telescopes (IACTs) after the Crab and the Vela pulsars. [...]
CERN-RE23-2024-004.- Geneva : CERN, 2024 Fulltext: PDF; Geminga_paper_after1stRevision: PDF; Geminga_paper_v3: PDF; Geminga_paper_v4: PDF; Geminga_paper_v5_comments_DM: PDF; Geminga_paper_v6: PDF; Geminga_paper_v7: PDF; Version 1 of the LST Geminga paper: PDF; Version 2 of the LST Geminga paper: PDF; coverLetter_revision1_Geminga: PDF;

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2024-06-14
16:30
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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2024-05-28
19:22
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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2024-03-08
12:11
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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