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