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Stumbleupon Review of :
http://www.spaceref.com/news/viewpr.html?pid=16187

From the page: “NASA Observes One of the Brightest Cosmic Explosions

Scientists detected a flash of light from across the Galaxy so powerful; it bounced off the moon and lit up the Earth’s upper atmosphere. The flash was brighter than anything ever detected from beyond our Solar System, and it lasted over a tenth of a second.