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This March 28, 2011 image provided by NASA shows composited images from Swift's Ultraviolet/Optical and X-ray telescopes of a gamma-ray explosion designated GRB 110328A. Scientists say this blast is unusual because the effects are long-lasting. More than a week later, they continue to see high-energy radiation spiking and fading at the source. Flaring from such an event usually lasts a couple of hours. (AP Photo/NASA, Swift, Stefan Immler)

This March 28, 2011 image provided by NASA shows composited images from Swift's Ultraviolet/Optical and X-ray telescopes of a gamma-ray explosion designated GRB 110328A. Scientists say this blast is unusual because the effects are long-lasting. More than a week later, they continue to see high-energy radiation spiking and fading at the source. Flaring from such an event usually lasts a couple of hours. (AP Photo/NASA, Swift, Stefan Immler)

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