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Relentless multi-wavelength variability of Mrk 421 and Mrk 501
(2022)PoS: Proceedings of Science ~ Proceedings of 37th International Cosmic Ray ConferenceMrk 421 and Mrk 501 are two close, bright and well-studied high-synchrotron-peaked blazars, which feature bright and persistent GeV and TeV emission. We use the longest and densest dataset of unbiased observations of these two sources, obtained at TeV and GeV energies during five years with FACT and Fermi-LAT. To characterize the variability and derive constraints on the emission mechanism, we augment the dataset with contemporaneous ...Conference Paper -
Discovery of TXS 1515-273 at VHE gamma-rays and modelling of its Spectral Energy Distribution
(2022)PoS: Proceedings of Science ~ 37th International Cosmic Ray Conference (ICRC 2021)In February 2019, a flaring state of the extreme blazar candidate TXS 1515-273 was registered by the Fermi-LAT, which triggered observations with the MAGIC telescopes and the X-ray satellites Swift, XMM-Newton and NuStar. The observations led to the discovery of the source at very-high-energy (VHE, 100 GeV < E < $ 100 TeV) gamma-ray energies and the detection of short time scales of variability (1 h) in several X-ray bands. The analysis ...Conference Paper -
BL Lac object 1ES 0647+250, a decade of MWL observations
(2022)PoS: Proceedings of Science ~ 37th International Cosmic Ray Conference (ICRC 2021)The high-peaked BL Lac object 1ES 0647+250 is one of the few distant blazars detected at very-high-energy (VHE, E>100 GeV) γ rays during non-flaring activity. Its redshift is still uncertain, with a recently proposed lower limit of z>0.29. This blazar was first detected by the MAGIC telescopes between 2009 and 2011 during its low state, displaying a flux of around 2% of the Crab Nebula above 100 GeV, but it has shown several periods of ...Conference Paper -
Protons Spectrum from MAGIC Telescopes data
(2022)PoS: Proceedings of Science ~ 37th International Cosmic Ray Conference (ICRC 2021)Imaging Atmospheric Cherenkov telescopes (IACTs) are designed to detect cosmic gamma rays. As a by-product, IACTs detect Cherenkov flashes generated by millions of hadronic air showers every night. We present the proton energy spectrum from several hundred GeV to several hundred TeV, retrieved from the hadron induced showers detected by the MAGIC telescopes. The protons are discriminated from He and other heavy nuclei by means of using ...Conference Paper -
Multi-wavelength study of Mrk 421 during a TeV flare
(2022)PoS: Proceedings of Science ~ 37th International Cosmic Ray Conference (ICRC 2021)The blazar Mrk 421 shows frequent, short flares in the TeV energy regime. Due to the fast nature of such episodes, we often fail to obtain sufficient simultaneous information about flux variations in several energy bands. To overcome this lack of multi-wavelength (MWL) coverage, especially for the pre- and post-flare periods, we have set up a monitoring program with the FACT telescope (TeV energies) and the Neil Gehrels Swift Observatory ...Conference Paper -
Recent MAGIC results on Galactic binaries
(2022)PoS: Proceedings of Science ~ 37th International Cosmic Ray Conference (ICRC 2021)X-ray and gamma-ray binaries are systems consisting of a compact object and normally a non-degenerate companion star. Most of these sources have been shown to emit radiation in a broad frequency range, from radio up to X-rays and sometimes gamma rays. We report on recent results in very high-energy gamma rays above 100 GeV obtained by the MAGIC Collaboration for the Galactic X-ray binaries MAXI J1820+070 and 1A 0535+262, and the gamma-ray ...Conference Paper -
Searching for VHE gamma-ray emission associated with IceCube neutrino alerts using FACT, H.E.S.S., MAGIC, and VERITAS
(2022)PoS: Proceedings of Science ~ 37th International Cosmic Ray Conference (ICRC 2021)The realtime follow-up of neutrino events is a promising approach to search for astrophysical neutrino sources. It has so far provided compelling evidence for a neutrino point source: the flaring gamma-ray blazar TXS 0506+056 was observed in coincidence with the high-energy neutrino IceCube-170922A detected by IceCube. The detection of very-high-energy gamma rays (VHE, E > 100 GeV) from this source helped establish the coincidence and ...Conference Paper -
Multi-epoch monitoring of TXS 0506+056 with MAGIC and MWL partners
(2022)PoS: Proceedings of Science ~ 37th International Cosmic Ray Conference (ICRC 2021)The measurement of an astrophysical flux of high-energy neutrinos by IceCube is an important step towards finding the long-sought sources of cosmic rays. Nevertheless, the long exposure neutrino sky map shows no significant indication of point sources so far. The real-time followup of neutrino events turned out to be the most successful approach in neutrino point-source searches. It brought, among others, the most compelling evidence for ...Conference Paper -
Multiwavelength observations in 2019-2020 of a new very-high-energy gamma-ray emitter: the flat spectrum radio quasar QSO B1420+326
(2022)PoS: Proceedings of Science ~ 37th International Cosmic Ray Conference (ICRC 2021)The flat-spectrum radio quasar QSO B1420+326 underwent an enhanced γ-ray flux state seen by Fermi-LAT at the turn of 2019/2020. Compared to the low state both the position and luminosity of the two spectral energy distribution peaks changed by at least two orders of magnitude. The high state resulted in the discovery of the very-high-energy (>100 GeV) γ-ray emission from the source by the MAGIC telescopes. The organized multiwavelength ...Conference Paper -
Relentless multi-wavelength variability of Markarian 421 and Markarian 501
(2022)PoS: Proceedings of Science ~ 37th International Cosmic Ray Conference (ICRC 2021)Mrk 421 and Mrk 501 are two close bright and well-studied high-synchrotron-peaked blazars, which feature bright and persistent GeV and TeV emission. We use the longest and densest dataset of unbiased observations of these two sources, obtained at TeV and GeV energies during 5 years with the FACT telescope and Fermi-LAT. To characterize the variability and derive constraints on the emission mechanism, we augment the dataset with contemporaneous ...Conference Paper