The signature of supernova ejecta in the X-ray afterglow of the γ-ray burst 011211

  title={The signature of supernova ejecta in the X-ray afterglow of the $\gamma$-ray burst 011211},
  author={J. N. Reeves and Darach Watson and Julian P. Osborne and Kenneth Alwyne Pounds and P. T. O’Brien and Alexander D. Short and Martin J. L. Turner and Mike G. Watson and Keith O. Mason and M. Ehle and Norbert Schartel},
Now that γ-ray bursts (GRBs) have been determined to lie at cosmological distances, their isotropic burst energies are estimated to be as high as 1054 erg (ref. 2), making them the most energetic phenomena in the Universe. The nature of the progenitors responsible for the bursts remains, however, elusive. The favoured models range from the merger of two neutron stars in a binary system to the collapse of a massive star. Spectroscopic studies of the afterglow emission could reveal details of the… 
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