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<p>In <a href="page.php?w=gamma-ray_astronomy">gamma-ray astronomy</a>, <b>gamma-ray bursts</b> (<b>GRBs</b>) are extremely energetic events occurring in distant <a href="page.php?w=Galaxy">galaxies</a> which represent the brightest and most powerful class of explosion in the Universe. These extreme <a href="page.php?w=Electromagnetic_radiation">electromagnetic</a> emissions are second only to the <a href="page.php?w=Big_Bang">Big Bang</a> as the most energetic and luminous phenomena known. Gamma-ray bursts can last from a few milliseconds to several</p><p>
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