RT Journal Article T1 Performance of the joint LST-1 and MAGIC observations evaluated with Crab Nebula data A1 Abe, Ko A1 Barrio Uña, Juan Abel A1 Cifuentes Alejandro, A1 Contreras González, José Luis A1 Láinez Lezáun, María A1 López Moya, Marcos A1 Martínez Vílchez, Oibar A1 Más-Aguilar, Álvaro A1 Miener, Tjark A1 Miranda Pantoja, José Miguel A1 Morcuende Parrilla, Daniel A1 Moya, Víctor A1 Polo, Miguel A1 Zywucka, Natalia AB Aims. Large-Sized Telescope 1 (LST-1), the prototype for the Large-Sized Telescope at the upcoming Cherenkov Telescope Array Observatory, is concluding its commissioning phase at the Observatorio del Roque de los Muchachos on the island of La Palma. The proximity of LST-1 to the two MAGIC (Major Atmospheric Gamma Imaging Cherenkov) telescopes makes it possible to carry out observations of the same gamma-ray events with both systems.Methods. We describe the joint LST-1+MAGIC analysis pipeline and used simultaneous Crab Nebula observations and Monte Carlo simulations to assess the performance of the three-telescope system. The addition of the LST-1 telescope allows for the recovery of events in which one of the MAGIC images is too dim to survive analysis quality cuts.Results. Thanks to the resulting increase in the collection area and stronger background rejection, we found a significant improvement in sensitivity, allowing for the detection of 30% weaker fluxes in the energy range between 200 GeV and 3 TeV. The spectrum of the Crab Nebula, reconstructed in the energy range between ∼60 GeV and ∼10 TeV, is in agreement with previous measurements. PB EDP Sciences SN 0004-6361 YR 2023 FD 2023 LK https://hdl.handle.net/20.500.14352/101253 UL https://hdl.handle.net/20.500.14352/101253 LA eng NO Abe, H., Abe, K., Abe, S., Acciari, V. A., Aguasca-Cabot, A., Agudo, I., ... & Houles, J. (2023). Performance of the joint LST-1 and MAGIC observations evaluated with Crab Nebula data. Astronomy & Astrophysics, 680, A66. NO Artículo firmado por 369 autores. NO Ministerio de Ciencia e Innovación (España) NO Junta de Andalucía NO Universidad de Jaén NO European Commission NO Gobierno de Canarias NO Generalitat de Catalunya DS Docta Complutense RD 12 abr 2025