Observation of X-ray lines from a gamma-ray burst (GRB991216): evidence of moving ejecta from the progenitor.

@article{Piro2000ObservationOX,
  title={Observation of X-ray lines from a gamma-ray burst (GRB991216): evidence of moving ejecta from the progenitor.},
  author={Luigi Piro and Gordon P. Garmire and M. Garcia and Giulia Stratta and Enrico Costa and Marco Feroci and P. M{\'e}sz{\'a}ros and Mario Vietri and Hale V. Bradt and Dale A. Frail and Filippo Frontera and Jules P. Halpern and John Heise and Kevin Hurley and Nobuyuki Kawai and R. Marc Kippen and F. E. Marshall and Toshiaki Murakami and Vladimir V. Sokolov and Toshiaki Takeshima and Atsumasa Yoshida},
  journal={Science},
  year={2000},
  volume={290 5493},
  pages={
          955-8
        }
}
We report on the discovery of two emission features observed in the x-ray spectrum of the afterglow of the gamma-ray burst (GRB) of 16 December 1999 by the Chandra X-ray Observatory. These features are identified with the Ly(alpha) line and the narrow recombination continuum by hydrogenic ions of iron at a redshift z = 1.00 +/- 0.02, providing an unambiguous measurement of the distance of a GRB. Line width and intensity imply that the progenitor of the GRB was a massive star system that ejected… 
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