from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A short-lived, localized, and intense burst of gamma radiation that originates outside the solar system from an unknown source.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A flash of gamma rays that seem to originate from a random point in the sky; their most likely sources are believed to be supernova explosions of a very massive stars and mergers of neutron stars.
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