Mission Archive

2 missions found

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Fermi

Active

NASA · 2008

Low Earth orbit

A NASA observatory that surveys the whole sky in gamma rays every three hours, studying pulsars, black-hole jets and gamma-ray bursts.

Swift

Completed

NASA · 2004

Low Earth orbit

A NASA observatory that caught gamma-ray bursts and turned within about a minute to observe their afterglows in X-ray, ultraviolet and visible light. Built for a two-year mission, it observed more than 2,000 bursts over nearly 22 years, until atmospheric drag pulled it too low to point steadily.