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gamma-ray burst
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Written by
John Donald Fernie
Professor Emeritus, Department of Astronomy and Astrophysics, University of Toronto, Ontario. Author of Setting Sail for the Universe: Astronomers and their Discoveries.
John Donald Fernie
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gamma-ray burst, an intense, nonrepeating flash of high-energy gamma rays that appears unpredictably at arbitrary points in the sky at a rate of about one per day and typically last only seconds. First discovered in the 1960s, these powerfully luminous events long remained completely mysterious, since there seemed no evidence of their sources at visible or radio wavelengths. Such evidence was first found in 1997, and the sources are now known to be among the most distant objects in the universe. The objects are thought to be collapsing hypergiant stars or, perhaps in some cases, merging neutron stars. There also exists a small group of much weaker, repeating bursts, which are identified with more local objects.

John Donald Fernie