Gamma Ray Burst- BOAT- GRB221009A
What’s in News:
- A gamma ray burst originated in the constellation Sagitta, called GRB221009A about 2.4 billion light years away is being called “the BOAT” – the brightest of all time – and is so powerful it has even affected Earth’s atmosphere
About
- This type of gamma ray burst (GRB) is thought to occur when a massive star explodes in a supernova, leaving behind a black hole.
- The explosion creates an extraordinary jet of light which makes up the GRB itself, and then the supernova causes a dimmer afterglow.
- This particular GRB appears so bright partially because it is about 2.4 billion light years away from Earth, making it one of the closest GRBs ever spotted in addition to being the brightest.
- GRB221009A is so bright that it is affecting Earth, even from billions of light years away.
- Naval radio transmitters recorded a strange disturbance in the upper atmosphere, which seems to have been caused by the powerful light from the GRB slamming into it.
- Detectors that search for high-energy photons – particles of light – have also seen extraordinary particles with energies far higher than anything produced at the Large Hadron Collider.
What is a Supernova?
- In a nutshell, a supernova is the violent explosion of a dying star. There are several sorts of supernova explosions, but all may generate more energy in a few seconds than our sun does in its whole lifetime.
- For a brief moment, certain supernovae may outshine an entire galaxy.
- As a star burns through its fuel and begins to cool, the outward forces of pressure drop. When the pressure drops low enough in a massive star, gravity suddenly takes over and the star collapses in just seconds. This collapse produces the explosion we call a supernova.
What are Gamma-ray Bursts?
- Gamma-ray bursts (GRBs) are short-lived bursts of gamma-ray light, the most energetic form of light. Lasting anywhere from a few milliseconds to several minutes, GRBs shine hundreds of times brighter than a typical supernova and about a million trillion times as bright as the Sun.
- A gamma-ray burst will emit the same amount of energy as a supernova, caused when a star collapses and explodes, but in seconds or minutes rather than weeks.
- When a GRB erupts, it is briefly the brightest source of cosmic gamma-ray photons in the observable Universe.
- They are associated with the deaths of massive stars in supernovas; though not every supernova produces a gamma-ray burst.
- Two different classes of bursts: long-duration and short-duration, but the end result in both cases is a brand new black hole.
- Long-duration bursts last anywhere from 2 seconds to a few hundreds of seconds (several minutes), with an average time of about 30 seconds. They are associated with the deaths of massive stars in supernovas; though not every supernova produces a gamma-ray burst.
- Short duration bursts are those that last less than 2 seconds; lasting anywhere from a few milliseconds to 2 seconds with an average duration of about 0.3 seconds (or 300 milliseconds). These bursts appear to be associated with the merger of two neutron stars into a new black hole or a neutron star with a black hole to form a larger black hole.
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