Sunday, April 2, 2023

3940 - GAMMA RAY BURSTS - 2022 discoveries?

 

-   3940 -  GAMMA  RAY  BURSTS  -  2022 discoveries?    Gamma-ray bursts (GRBs) are brief, bright flashes of gamma-ray light that are thought to be the most powerful explosions in our universe since the Big Bang. GRBs are  released during extreme stellar explosions or supernovas, when a dying star runs out of fuel and collapses into a neutron star or even a black hole.


------------  3940  -  GAMMA  RAY  BURSTS  -  2022 discoveries?

-    The brightest gamma-ray burst ever detected is revealing new mysteries as scientists study it in greater detail.   Astronomers found that the evolution of the radio waves released by an enormous stellar explosion seen in 2022 was slower than models predicted, raising questions about how the release of energy evolves during ultra-powerful gamma-ray bursts.

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-    The brightest burst ever seen, known as “GRB 221009A”, was first detected on Oct. 9, 2022 by gamma-ray and X-ray telescopes. The likely supernova that caused the burst was 2.4 billion light-years away from Earth.

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-    While the burst itself lasted just a few seconds, it left behind an "afterglow" of emissions across the light spectrum that may persist for years. Initially, there is a bright forward shock caused by the materials ejected by the gamma-ray burst followed by a reverse shock back into the cloud of ejecta. Both shocks contribute to the afterglow.

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-    Researchers began gathering data from this afterglow within three hours of spotting the initial gamma-ray burst, finding that the burst was 70 times brighter than any burst ever detected. It's likely that a gamma-ray burst of this size is a 1 in 10,000-year event.

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-    Astronomers have not yet detected any sign of the supernova that spurred the gamma-ray burst, but they suspect that the stellar explosion resulted in the creation of a brand-new black hole.

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-    The far-off location of the burst, which is in the direction of the constellation “Sagitta, the Arrow,” went behind the sun, from Earth's perspective, in December 2022 and only re-emerged in mid-February. The clear line of sight will again enable astronomers to measure the remaining afterglow from the burst.

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                   March 31, 2023      GAMMA  RAY  BURSTS  -  2022 discoveries?            3926                                                                                                                          

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--------------------- ---  Sunday, April 2, 2023  ---------------------------

 

 

 

 

         

 

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