Abe, H.H.AbeAbe, K.K.AbeAbe, S.S.AbeAguasca-Cabot, A.A.Aguasca-CabotAgudo, I.I.AgudoAlvarez Crespo, N.N.Alvarez CrespoANTONELLI, Lucio AngeloLucio AngeloANTONELLIAramo, C.C.AramoArbet-Engels, A.A.Arbet-EngelsArcaro, C.C.ArcaroArtero, M.M.ArteroAsano, K.K.AsanoAubert, P.P.AubertBaktash, A.A.BaktashBamba, A.A.BambaBaquero Larriva, A.A.Baquero LarrivaBARONCELLI, LeonardoLeonardoBARONCELLIBarres de Almeida, U.U.Barres de AlmeidaBarrio, J. A.J. A.BarrioBatkovic, I.I.BatkovicBaxter, J.J.BaxterBecerra González, J.J.Becerra GonzálezBernardini, E.E.BernardiniBernardos, M. I.M. I.BernardosBernete Medrano, J.J.Bernete MedranoBerti, A.A.BertiBhattacharjee, P.P.BhattacharjeeBiederbeck, N.N.BiederbeckBIGONGIARI, CiroCiroBIGONGIARIBissaldi, E.E.BissaldiBlanch, O.O.BlanchBONNOLI, GiacomoGiacomoBONNOLIBordas, P.P.BordasBorghese, A.A.BorgheseBULGARELLI, ANDREAANDREABULGARELLIBurelli, I.I.BurelliBuscemi, M.M.BuscemiCARDILLO , MARTINAMARTINACARDILLOCaroff, S.S.CaroffCarosi, A.A.CarosiCassol, F.F.CassolCauz, D.D.CauzCeribella, G.G.CeribellaChai, Y.Y.ChaiCheng, K.K.ChengChiavassa, A.A.ChiavassaChikawa, M.M.ChikawaChytka, L.L.ChytkaCifuentes, A.A.CifuentesContreras, J. L.J. L.ContrerasCortina, J.J.CortinaCostantini, H.H.CostantiniD'Amico, G.G.D'AmicoDalchenko, M.M.DalchenkoDe Angelis, A.A.De Angelisde Bony de Lavergne, M.M.de Bony de LavergneDe Lotto, B.B.De Lottode Menezes, R.R.de MenezesDeleglise, G.G.DelegliseDelgado, C.C.DelgadoDelgado Mengual, J.J.Delgado Mengualdella Volpe, D.D.della VolpeDellaiera, M.M.DellaieraDepaoli, D.D.DepaoliDi Piano, A.A.Di PianoDi Pierro, F.F.Di PierroDi Tria, R.R.Di TriaDi Venere, L.L.Di VenereDíaz, C.C.DíazDominik, R. M.R. 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L.SchubertSchussler, F.F.SchusslerSchweizer, T.T.SchweizerSeglar Arroyo, M.M.Seglar ArroyoSilvia, R.R.SilviaSitarek, J.J.SitarekSliusar, V.V.SliusarSpolon, A.A.SpolonStrišković, J.J.StriškovićStrzys, M.M.StrzysSuda, Y.Y.SudaSunada, Y.Y.SunadaTajima, H.H.TajimaTakahashi, H.H.TakahashiTakahashi, M.M.TakahashiTakata, J.J.TakataTakeishi, R.R.TakeishiTam, P. H. T.P. H. T.TamTanaka, S. J.S. J.TanakaTateishi, D.D.TateishiTejedor, L. A.L. A.TejedorTemnikov, P.P.TemnikovTerada, Y.Y.TeradaTerauchi, K.K.TerauchiTerzic, T.T.TerzicTeshima, M.M.TeshimaTluczykont, M.M.TluczykontTokanai, F.F.TokanaiTorres, D. F.D. F.TorresTravnicek, P.P.TravnicekTruzzi, S.S.TruzziTutone, A.A.TutoneUhlrich, G.G.UhlrichVacula, M.M.VaculaVALLANIA, PIEROPIEROVALLANIAvan Scherpenberg, J.J.van ScherpenbergVázquez Acosta, M.M.Vázquez AcostaVerguilov, V.V.VerguilovViale, I.I.VialeVigliano, A.A.ViglianoVigorito, C. F.C. F.VigoritoVitale, V.V.VitaleVoutsinas, G.G.VoutsinasVovk, I.I.VovkVuillaume, T.T.VuillaumeWalter, R.R.WalterWill, M.M.WillYamamoto, T.T.YamamotoYamazaki, R.R.YamazakiYoshida, T.T.YoshidaYoshikoshi, T.T.YoshikoshiZywucka, N.N.ZywuckaBernlöhr, K.K.BernlöhrGueta, O.O.GuetaKosack, K.K.KosackMaier, G.G.MaierWatson, J.J.Watson2025-02-282025-02-2820230004-637Xhttp://hdl.handle.net/20.500.12386/36312The Cherenkov Telescope Array (CTA) is a next-generation ground-based observatory for gamma-ray astronomy at very high energies. The Large-Sized Telescope prototype (LST-1) is located at the CTA-North site, on the Canary Island of La Palma. LSTs are designed to provide optimal performance in the lowest part of the energy range covered by CTA, down to ≃20 GeV. LST-1 started performing astronomical observations in 2019 November, during its commissioning phase, and it has been taking data ever since. We present the first LST-1 observations of the Crab Nebula, the standard candle of very-high-energy gamma-ray astronomy, and use them, together with simulations, to assess the performance of the telescope. LST-1 has reached the expected performance during its commissioning period-only a minor adjustment of the preexisting simulations was needed to match the telescope's behavior. The energy threshold at trigger level is around 20 GeV, rising to ≃30 GeV after data analysis. Performance parameters depend strongly on energy, and on the strength of the gamma-ray selection cuts in the analysis: angular resolution ranges from 0.°12-0.°40, and energy resolution from 15%-50%. Flux sensitivity is around 1.1% of the Crab Nebula flux above 250 GeV for a 50 hr observation (12% for 30 minutes). The spectral energy distribution (in the 0.03-30 TeV range) and the light curve obtained for the Crab Nebula agree with previous measurements, considering statistical and systematic uncertainties. A clear periodic signal is also detected from the pulsar at the center of the Nebula....STAMPAenArticle10.3847/1538-4357/ace89d2-s2.0-85175444327https://api.elsevier.com/content/abstract/scopus_id/85175444327https://iopscience.iop.org/article/10.3847/1538-4357/ace89dFIS/05 - ASTRONOMIA E ASTROFISICAERC sectors::Physical Sciences and Engineering::PE9 Universe sciences: astro-physics/chemistry/biology; solar systems; stellar, galactic and extragalactic astronomy, planetary systems, cosmology, space science, instrumentation