What is a Gamma Ray Burst (GRB)?

About Gamma Ray Burst (GRB):

• GRBs are short-lived bursts of gamma-ray light, the most energetic form of light.
• GRB emits more energy in a few seconds than our Sun will emit in its lifetime and has two distinct emission phases:
  • the short-lived prompt emission (the initial burst phase that emits gamma-rays), followed by a long-lived multi-wavelength afterglow phase.
• The shortest GRBs likely mark the collision of two compact stellar remnants called neutron stars, and the longest bursts are thought to arise when a massive, rapidly spinning star collapses to form a black hole.
• When a GRB erupts, it is briefly the brightest source of cosmic gamma-ray photons in the observable Universe.

 What are Gamma Rays?

• Gamma rays have the smallest wavelengths and the most energy of any wave in the electromagnetic spectrum
• They are produced by the hottest and most energetic objects in the universe, such as neutron stars and pulsars, supernova explosions, and regions around black holes.
• On Earth, gamma waves are generated by nuclear explosions, lightning, and the less dramatic activity of radioactive decay.

 

---

Q1) What is the electromagnetic spectrum?

The electromagnetic (EM) spectrum is the range of all types of EM radiation. Radiation is energy that travels and spreads out as it goes – the visible light that comes from a lamp in your house and the radio waves that come from a radio station are two types of electromagnetic radiation. The other types of EM radiation that make up the electromagnetic spectrum are microwaves, infrared light, ultraviolet light, X-rays and gamma-rays.

Source: 'Monstrous' gamma-ray burst brightest seen since 'human civilization began'