This all-sky picture is compiled from gamma-rays collected and analyzed by the EGRET (Energetic Gamma-Ray Telescope) instrument aboard CGRO, the Compton Gamma-Ray Observatory.

To view a slide show of the Milky Way at increasing gamma-ray energies, compiled from EGRET data, go here.

How will GLAST be better than EGRET ?

The GLAST brochure describes the detector on

the top of page 19, page 20, page 21, page 22, page 23, and page 24.