Very high energy follow-up programs of gravitational wave and transient alerts with the MAGIC telescopes

2017 ◽  
Author(s):  
Keyword(s):  
Gravitational Wave ◽  
High Energy ◽  
Very High Energy ◽  
Very High

scholarly journals H.E.S.S. Follow-up Observations of Binary Black Hole Coalescence Events during the Second and Third Gravitational-wave Observing Runs of Advanced LIGO and Advanced Virgo

2021 ◽  
Vol 923 (1) ◽  
pp. 109
Author(s):  
H. Abdalla ◽  
F. Aharonian ◽  
F. Ait Benkhali ◽  
E. O. Angüner ◽  
H. Ashkar ◽  
...  
Keyword(s):  
Black Hole ◽  
Gravitational Wave ◽  
High Energy ◽  
Binary Black Hole ◽  
Upper Limits ◽  
Very High Energy ◽  
Stereoscopic System ◽  
The Times ◽  
Very High

Abstract We report on the observations of four well-localized binary black hole (BBH) mergers by the High Energy Stereoscopic System (H.E.S.S.) during the second and third observing runs of Advanced LIGO and Advanced Virgo, O2 and O3. H.E.S.S. can observe 20 deg2 of the sky at a time and follows up gravitational-wave (GW) events by “tiling” localization regions to maximize the covered localization probability. During O2 and O3, H.E.S.S. observed large portions of the localization regions, between 35% and 75%, for four BBH mergers (GW170814, GW190512_180714, GW190728_064510, and S200224ca). For these four GW events, we find no significant signal from a pointlike source in any of the observations, and we set upper limits on the very high energy (>100 GeV) γ-ray emission. The 1–10 TeV isotropic luminosity of these GW events is below 1045 erg s−1 at the times of the H.E.S.S. observations, around the level of the low-luminosity GRB 190829A. Assuming no changes are made to how follow-up observations are conducted, H.E.S.S. can expect to observe over 60 GW events per year in the fourth GW observing run, O4, of which eight would be observable with minimal latency.

scholarly journals Recent follow-up observations of GRBs in the very high energy band with the MAGIC Telescopes

2016 ◽  
Author(s):  
Alessandro Carosi ◽  
Antonella Antonelli ◽  
Josefa Becerra Gonzalez ◽  
Alessio Berti ◽  
Stefano Covino ◽  
...  
Keyword(s):  
Energy Band ◽  
High Energy ◽  
High Energy Band ◽  
Very High Energy ◽  
Very High

scholarly journals Searching for very-high-energy electromagnetic counterparts to gravitational-wave events with the Cherenkov Telescope Array

2021 ◽  
Author(s):  
Barbara Patricelli ◽  
Alessandro Carosi ◽  
Lara Nava ◽  
Monica Seglar-Arroyo ◽  
Fabian Schüssler ◽  
...  
Keyword(s):  
Gravitational Wave ◽  
High Energy ◽  
Telescope Array ◽  
Cherenkov Telescope ◽  
Very High Energy ◽  
Very High

scholarly journals Search for High Energy emission from GRBs with MAGIC

2016 ◽  
Vol 12 (S324) ◽  
pp. 70-73
Author(s):  
Alessio Berti ◽  
Keyword(s):  
Gamma Ray ◽  
High Energy ◽  
Cherenkov Telescopes ◽  
Gamma Ray Imaging ◽  
Very High Energy ◽  
Γ Rays ◽  
High Energy Emission ◽  
The Universe ◽  
Very High

AbstractGamma-Ray Bursts (GRBs) are the most violent explosions in the Universe, releasing a huge amount of energy in few seconds. While our understanding of the prompt and the afterglow phases has increased with Swift and Fermi, we have very few information about their High Energy (HE, E ≲ 100) emission components. This requires a ground-based experiment able to perform fast follow-up with enough sensitivity above ~ 50 GeV. The MAGIC (Major Atmospheric Gamma-ray Imaging Cherenkov) telescopes have been designed to perform fast follow-up on GRBs thanks to fast slewing movement and low energy threshold (~ 50 GeV). Since the beginning of the operations, MAGIC followed-up 89 GRBs in good observational conditions. In this contribution the MAGIC GRBs follow-up campaign and the results which could be obtained by detecting HE and Very High Energy (VHE, E ≳ 100 GeV) γ-rays from GRBs will be reviewed.

scholarly journals MWL Picture Of The Blazar S5 0716+714 During Its Brightest Outburst

2016 ◽  
Author(s):  
Marina Manganaro ◽  
Giovanna Pedaletti ◽  
Marlene Doert ◽  
Denis Bastieri ◽  
Vandad Fallah Ramazani ◽  
...  
Keyword(s):  
Time Window ◽  
Spectral Energy Distribution ◽  
Broad Band ◽  
High Energy ◽  
Spectral Energy ◽  
Time Variability ◽  
Multi Wavelength ◽  
Very High Energy ◽  
Very High

S5 0716+714 is a well known BL-Lac object, one of the brightest and most active blazars. The discovery in the Very High Energy band (VHE, E > 100 GeV) by MAGIC happened in 2008. In January 2015 the source went through the brightest optical state ever observed, triggering MAGIC follow-up and a VHE detection with ~ sigma significance (ATel #6999). Rich multi-wavelength coverage of the flare allowed us to construct the broad-band spectral energy distribution of S5 0716+714 during its brightest outburst. In this work we will present the preliminary analysis of MAGIC and Fermi-LAT data of the flaring activity in January and February 2015 for the HE and VHE band, together with radio (Metsahovi, OVRO, VLBA, Effelsberg), sub-millimeter (SMA), optical (Tuorla, Perkins, Steward, AZT-8+ST7, LX-200, Kanata), X-ray and UV (Swift-XRT and UVOT), in the same time-window and discuss the time variability of the MWL light curves during this impressive outburst.

Strong interactions at very high energy

1964 ◽  
Vol 82 (1) ◽  
pp. 3-81 ◽  
Author(s):  
Evgenii L. Feinberg ◽  
Dmitrii S. Chernavskii
Keyword(s):  
High Energy ◽  
Strong Interactions ◽  
Very High Energy ◽  
Very High
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