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Can I invoke the standard statement which used to be used for freeware ;

You are, of course, welcome to consult and make use of my pages at will. However, if you have found them useful in any appreciable way, please consider sending a small disbursement (even something as small as 1 Euro/Pound/Dollar/etc. would be received with appreciation).

B. Daugherty, 31 MH, Portsmouth PO5 3JG, Britain.

Gamma Ray Astronomy


There is a band of this radiation coming from the plane of the Milky Way, in addition to specific objects like neutron stars, and there is also a source at the center of the Milky Way.


Their wavelengths are smaller than the atoms in a mirror so γ-rays cannot be focused by reflection. Modern satellites use scintillators which convert γ-rays into photons The first dedicated Gamma Ray satellite was COS-B launched in 1975 by ESA.

1991 Compton


  • Milky Way
  • Cosmic rays ploughing into gas clouds. Believed to be much of cosmic gamma-ray source, allowing information to be derived on cosmic rays.
  • Some pulsars
  • Some quasars

Gamma Ray Bursters

A research satellite first detected a burster in 1968, although they had been detected by the military just before and kept secret. They are high-energy fluxes lasting several seconds - the flux detected is greater than any other object outside the Solar system.

Gamma-ray outbursts are distributed randomly across the sky and in 1997 were shown, by analysis of the all-sky map of bursts produced by the Compton Gamma-Ray Observatory and comparison with optically identified sources, to lie at distances of billions of light years.

Several thousand gamma-ray bursts have been detected.

Crab Nebula

Big Red Spot on Jupiter