Antoranz Canales, PedroBarrio Uña, Juan AbelContreras González, José LuisFonseca González, María VictoriaLópez Moya, MarcosMiranda Pantoja, José Miguel2023-06-202023-06-202006-03-100004-637X10.1086/499421https://hdl.handle.net/20.500.14352/50935© The American Astronomical Society. We would like to thank the IAC for the excellent working conditions on the La Palma Observatory Roque de los Muchachos. We are grateful to the RXTEASMteam for their quick-look results. The support of the German BMBF and MPG, the Italian INFN, and the Spanish CICYT is gratefully acknowledged. This work was also supported by ETH research grant TH-34/04-3 and Polish grant MNiI 1P03D01028.The MAGIC Cerenkov telescope has observed very high energy (VHE) gamma-ray emission from the active galactic nucleus 1ES 1959+650 during 6 hr in 2004 September and October. The observations were carried out alternating with observations of the Crab Nebula, whose data were used as a reference source for optimizing gamma -ray/hadron separation and for flux comparison. The data analysis shows VHE gamma-ray emission of 1ES 1959+650 with similar to 8 sigma significance, at a time of low activity in both optical and X-ray wavelengths. An integral flux above similar to 180 GeV of about 20% that of the Crab Nebula was obtained. The light curve, sampled over 7 days, shows no significant variations. The differential energy spectrum between 180 GeV and 2 TeV can be fitted with a power-law of index -2.72 +/- 0.14. The spectrum is consistent with the slightly steeper spectrum seen by HEGRA at higher energies, also during periods of low X-ray activity.engjournal articlehttp://dx.doi.org/10.1086/499421http://iopscience.iop.orghttp://arxiv.org/abs/astro-ph/0508543open access537539.1TEV Blazar 1ES-1959+650Radio-SourcesAccelerationSensitivityNeutrinosSpectraObjects.Electrónica (Física)ElectricidadFísica nuclear2202.03 Electricidad2207 Física Atómica y Nuclear