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 Hubble Tracks the Fading Optical Counterpart of a Gamma-Ray
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Hubble Tracks the Fading Optical Counterpart of a Gamma-Ray Burst

February 8, 2005
The Hubble telescope has made an important contribution toward solving one of astronomy's greatest enigmas by allowing astronomers to continue watching the fading visible-light counterpart of a gamma-ray burst, one of the most energetic and mysterious events in the universe.

The so-called optical counterpart is presumably a cooling fireball from the catastrophic event that triggered the massive burst of invisible gamma rays ? the highest-energy radiation in the universe. This event may have unleashed as much energy in a few seconds as the Sun does in 10 billion years! The orange dot in the center of this Hubble image represents the burst's visible-light glow.