Gamma-ray bursts are extremely short-lived events, typically lasting only a few milliseconds.

Gamma-ray bursts emit high-energy photons in the MeV to GeV range.

Gamma-ray bursts can be produced by various cataclysmic events, including supernovae, neutron star mergers, and black hole formation.

Gamma-ray bursts are typically located at cosmological distances, millions of light-years away from Earth.

The afterglow is a faint emission that follows the initial gamma-ray burst and can last for days or even weeks.

The afterglow can emit radiation across a wide range of wavelengths, including radio waves, infrared radiation, optical light, and X-rays.

The afterglow is produced by various mechanisms, including synchrotron radiation, inverse Compton scattering, and bremsstrahlung radiation.

Studying gamma-ray bursts and their afterglows can provide valuable insights into the properties of neutron stars and black holes, the evolution of galaxies, and the large-scale structure of the universe.

The Swift Gamma-Ray Burst Mission is a NASA satellite dedicated to studying gamma-ray bursts and their afterglows.

GRB 780325A was the first gamma-ray burst detected, discovered in 1978 by the Vela satellites.

GRB 130427A holds the record for the longest gamma-ray burst, lasting approximately 2 minutes.

GRB 080916C is the closest gamma-ray burst detected to date, located approximately 2.4 billion light-years away.

GRB 980425 was the first gamma-ray burst to be associated with a supernova, SN 1998bw.

GRB 130427A is the most energetic gamma-ray burst detected, releasing approximately 10^54 ergs of energy.

GRB 170817A was associated with a kilonova, a short-lived optical transient produced by the merger of two neutron stars.