Gamma ray burst

[alokmohan]

U.S. astronomers have determined flares seen after a gamma-ray burst are apparently a continuation of the burst itself.<br /><br />Gamma-ray bursts release in seconds the same amount of energy the sun will emit during its expected 10 billion-year lifetime. That energy comes from the core of a massive star collapsing to form a black hole or neutron star.<br /><br />Early in its mission, the National Aeronautics and Space Administration's Swift satellite's X-ray Telescope discovered the initial pulse of gamma-rays -- known as prompt emission -- is often followed by short-lived but powerful, X-ray flares, suggesting a GRB's central engines remain active long after the prompt emission.<br /><br />In the latest study, Hans Krimm and colleagues at the Universities Space Research Association and the Goddard Space Flight Center demonstrated X-ray flares are indeed a continuation of the prompt emission.<br /><br />"This pattern points to a continuous injection of energyhttp://www.sciencedaily.com/upi/index.php?feed=Science&article=UPI-1-20070523-12384100-bc-us-gammaraybursts.xml<br />

 

[docm]

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