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Piro L, Garmire G, Garcia M, et al. Observation of X-ray lines from a gamma-ray burst (GRB991216): evidence of moving ejecta from the progenitor. Science. 2000;290(5493):955-8doi: 10.1126/science.290.5493.955.
Piro, L., Garmire, G., Garcia, M., Stratta, G., Costa, E., Feroci, M., Mészáros, P., Vietri, M., Bradt, H., Frail, D., Frontera, F., Halpern, J., Heise, J., Hurley, K., Kawai, N., Kippen, R. M., Marshall, F., Murakami, T., Sokolov, V. V., Takeshima, T., & Yoshida, A. (2000). Observation of X-ray lines from a gamma-ray burst (GRB991216): evidence of moving ejecta from the progenitor. Science (New York, N.Y.), 290(5493), 955-8. https://doi.org/10.1126/science.290.5493.955
Piro, L, et al. "Observation of X-ray lines from a gamma-ray burst (GRB991216): evidence of moving ejecta from the progenitor." Science (New York, N.Y.) vol. 290,5493 (2000): 955-8. doi: https://doi.org/10.1126/science.290.5493.955
Piro L, Garmire G, Garcia M, Stratta G, Costa E, Feroci M, Mészáros P, Vietri M, Bradt H, Frail D, Frontera F, Halpern J, Heise J, Hurley K, Kawai N, Kippen RM, Marshall F, Murakami T, Sokolov VV, Takeshima T, Yoshida A. Observation of X-ray lines from a gamma-ray burst (GRB991216): evidence of moving ejecta from the progenitor. Science. 2000 Nov 03;290(5493):955-8. doi: 10.1126/science.290.5493.955. PMID: 11062121.
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Science. 2000 Nov 03;290(5493):955-8. doi: 10.1126/science.290.5493.955.

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

Science (New York, N.Y.)

L Piro, G Garmire, M Garcia, G Stratta, E Costa, M Feroci, P Mészáros, M Vietri, H Bradt, D Frail, F Frontera, J Halpern, J Heise, K Hurley, N Kawai, R M Kippen, F Marshall, T Murakami, V V Sokolov, T Takeshima, A Yoshida

Affiliations

  1. Istituto Astrofisica Spaziale, Consiglio Nazionale delle Ricerche (CNR), Via Fosso del Cavaliere, 00133 Roma, Italy. [email protected]

PMID: 11062121 DOI: 10.1126/science.290.5493.955

Abstract

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, before the GRB event, a quantity of iron approximately 0.01 of the mass of the sun at a velocity approximately 0.1 of the speed of light, probably by a supernova explosion.

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