CNN - April 29, 2009
(CNN) -- Edo Berger got an alert early last Thursday morning when a satellite detected a 10-second blast of energy known as a gamma ray burst coming from outer space.
Telescopes around the world swiveled to focus on the explosion, soon picking up infrared radiation, which travels more slowly than gamma rays. Berger waited for the visible light which he expected to come next.
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The gamma radiation from GRB 090423, which took 13 billion years to reach earth, was detected by a NASA satellite called Swift. The infrared radiation was detected by the Gemini Observatory in Hawaii.