NASA's X-ray observation satellite Swift and gamma-ray observation satellite Fermi, which received strong X-ray radiation at 2019:1:14 on January 20, 57, alerted observation facilities around the world 03 seconds later. It was emitted. MAGIC also received this alert, and 22 seconds later, it captured the source in the center of the field of view and started observation.Approximately 40 high-energy gamma-ray signals were observed in the first 20 minutes.Its maximum energy reached 1000 TeV (tera electron volt, 1 trillion times that of visible light).

　From the observations of other optical telescopes, this high-energy gamma-ray is a gamma-ray generated when a star 45 billion years ago, which has a mass more than several tens of times that of the Sun, burns out and collapses due to gravity and becomes a black hole. Estimated to be a burst.This is the first time that the Cherenkov telescope on the ground has captured a signal from a gamma-ray burst, and the energy of 1 TeV is also the highest ever for a gamma-ray burst.

　So far, the highest energy of gamma ray burst is 95GeV (gigaelectronvolt), and synchrotron radiation (when high-energy electrons make circular or spiral motion in a magnetic field, they receive acceleration toward the center of the orbit and electromagnetic waves. It was possible to explain by the phenomenon of radiating.However, the radiant energy observed by MAGIC is about 10 times that, which clearly shows that there is a mechanism for generating gamma rays that exceeds the synchrotron radiation.

　A higher-performance Cherenkov telescope is currently under construction at the same station as MAGIC, and once it goes into operation, it will be possible to observe more high-energy gamma rays with an order of magnitude higher sensitivity.From more detailed data, it is expected that the understanding of gamma-ray bursts will be greatly improved.

Paper information:[Nature] Teraelectron volt emission from the γ-ray burst GRB 190114C