Gamma-ray burst
gamma-ray bursts are the brightest and most energetic electromagnetic events known to occur in the universe. They were first detected in 1967 by the Vela satellites, which had been designed to detect covert nuclear weapons tests. A subclass of GRBs appear to originate from the merger of binary neutron stars. In October 2018, astronomers reported that GRB 150101B and GW170817, a gravitational wave event detected in 2017, may have been produced by the same mechanism.
About Gamma-ray burst in brief
gamma-ray bursts are the brightest and most energetic electromagnetic events known to occur in the universe. Bursts can last from ten milliseconds to several hours. They were first detected in 1967 by the Vela satellites, which had been designed to detect covert nuclear weapons tests. A subclass of GRBs appear to originate from the merger of binary neutron stars. In October 2018, astronomers reported that GRB 150101B and GW170817, a gravitational wave event detected in 2017, may have been produced by the same mechanism. In November 2019, researchers reported a notable gamma ray burst, named GRB 1901C, which produced the highest energy cosmic event ever observed for a cosmic event – about 1,000 electron volts – and may be caused by a kilonova. It has been hypothesized that a gamma-rays burst in the Milky Way, pointing directly towards the Earth, could cause a mass extinction event. The sources of most GRBs are billions of light years away from Earth, implying that the explosions are both extremely energetic and extremely rare (see below). For decades after the discovery of the GRBs, astronomers searched for a counterpart at other wavelengths: i.e. white dwarfs, pulsars, supernovae, and other objects in positional coincidence with a GRB burst. Astronomers considered many distinct classes of objects, including supernovars and pulsars. In January 2019, astronomers considered any astronomical object in a positional position with a burst of gamma ray energy – such as a supernovar or a neutron star – as a distinct object.
The results of this search were published in the journal The Astrophysics of Supernovae and Black Holes, published by the University of California, Los Alamos, on January 14, 2019. It is the first time in the history of astrophysics that the authors have looked at objects in such a positional state. The authors conclude that GRBs may be more common than previously understood, according to the nature of the merger events, and both may be the result of a more common mechanism – the neutron stars merger. They conclude that the GRB events may be a result of both a merger of neutron stars, as well as a neutron-star merger, which may be both the cause of the burst and the origin of the gamma rays. The study is published as part of the Astrophysical Journal Supplement, which also includes an article on the effects of gravitational waves on our understanding of the universe and the formation of new stars. The full article is available online at: http://www.astrophysicaljournal.com/news/article/grb-150101b-gmb-1414C- gravitational-wave-events-in-positional-coinciding-occurrence-with-a-supernovar-and-black-hole-collision-of-two-neutron-star-merger-merging-of two- neutron-stars-that-may-be-the-same.
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This page is based on the article Gamma-ray burst published in Wikipedia (as of Dec. 06, 2020) and was automatically summarized using artificial intelligence.
