Christmas gamma-ray burst debated
This is one model, depicted in an artist's impression, of a mysterious gamma-ray burst observed last Christmas.
November 30th, 2011
06:18 PM ET
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Christmas gamma-ray burst debated

Last Christmas, researchers got a present that wasn't so neatly wrapped: an unusual gamma-ray burst.

This week in the journal Nature, two groups of scientists offer differing explanations for the strange observations about this gamma-ray burst, detected on December 25, 2010. It was discovered by the Burst Alert Telescope on NASA's Swift satellite.

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