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Dying Supergiant Stars Implicated in Hours-long Gamma-Ray
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Dying Supergiant Stars Implicated in Hours-long Gamma-Ray Bursts

May 7, 2013
GRB 111209A exploded on Dec. 9, 2011. The blast produced high-energy emission for an astonishing seven hours, earning a record as the longest-duration GRB ever observed. This false-color image shows the event as captured by the X-ray Telescope aboard NASA's Swift satellite. Credit: NASA/Swift/B. Gendre (ASDC/INAF-OAR/ARTEMIS)