It’s a boat: astronomers observe “brightest ever” gamma-ray burst

Astronomers believe that the gamma-ray burst GRB 221009A marks the birth of a new black hole at the center of a collapsing star. Source: NASA/Swift/Cruz deWilde On the morning of October 9, several space-based detectors captured a powerful gamma-ray burst (GRB) passing through our solar system, sending astronomers around the world busy to train their telescopes for that part. It moved. Collect important data about events and their afterglow. Astronomers, designated GRB 221009A, say the gamma-ray burst is the most powerful ever recorded and likely the “birth cry” of a new black hole. The incident was immediately published on Astronomer’s Telegram, and observations are still ongoing. “Our research group called this explosion ‘BOAT’ or the brightest explosion ever. Because these explosions are noticeable when you look at the thousands of explosions detected by gamma-ray telescopes since the 1990s. ” said Jillian Rastinejad, a graduate student at Northwestern University. Rastinejad led one of two independent teams using the Gemini South telescope in Chile to study the afterglow of the event. Polytechnic University of Bari, Italy Bari’s graduate student and graduate member, Roberta Pillera, said, “This explosion is exciting because it is much closer than a typical GRB, and it can detect many details that would otherwise be too faint to see.” Said Fermi Wide Area Telescope (LAT) collaboration. “But it’s doubly exciting because it’s one of the most lively and glowing explosions I’ve ever seen, regardless of distance.” The first gamma-ray bursts were observed thanks to the launch of the Vela satellite in the late 1960s by the US They were intended to detect gamma-ray signals from nuclear weapons testing under the 1963 nuclear test ban treaty with the Soviet Union. The United States feared that the Soviet Union was conducting a covert nuclear test in violation of the treaty.In July 1967, two of its satellites picked up flashes of gamma rays that were apparently not a sign of a nuclear weapons test. captured the afterglow approximately an hour after GRB 221009A was first detected NASA/Swift/A. Beardmore (University of Leicester) The data was deleted, but later, with improved equipment, the Vela satellite recorded several more gamma-ray bursts. The Los Alamos National Laboratory team analyzed when each explosion was detected by a different satellite to estimate the sky position of 16 such explosions, and they found that the explosion occurred on Earth or in the solar system. didn’t come , and published their conclusions in the Astrophysical Journal in 1973. There are two types of gamma-ray bursts. Most (70%) are long bursts lasting more than 2 seconds, often accompanied by a bright afterglow. They are usually associated with galaxies where stars form rapidly. Astronomers believe that the long burst is related to the collapse of a massive star to form a neutron star or black hole (or newly formed magneta). Baby black holes will create very powerful jets of particles that move close to the speed of light, powerful enough to pierce the remnants of progenitor stars that emit X-rays and gamma rays. Gamma-ray bursts lasting less than 2 seconds (about 30%) are considered short bursts and are usually emitted in regions where few stars are formed. Astronomers believe these gamma-ray bursts are the result of the two neutron stars or neutron stars that make up the “kilonova” merging with a black hole. That hypothesis was confirmed in 2017 when a LIGO collaboration captured gravitational wave signals from two neutron stars merging with a powerful gamma-ray burst associated with the kilonova. Earlier this year, astrophysicists discovered a mysterious X-ray they believed could be the first to detect kilonova “afterglow” from the same merger. (Or it may be the first observation of matter falling into a black hole formed after a merger.)
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