Discovery of a redshifted Iron K-feature in the X-ray afterglow of GRB 000214.

Details Discovery of a redshifted Iron K-feature in the X-ray afterglow of GRB 000214. Discovery of a redshifted Iron K-feature in the X-ray afterglow of GRB 000214.

Oct 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000head....5.3003a&link_type=abstract

American Astronomical Society, HEAD Meeting #5, #30.03; Bulletin of the American Astronomical Society, Vol. 32, p.1231

Astronomy and Astrophysics

Astronomy

Scientific paper

We report the detection (3σ significance level) of a strong iron emission line in the X-ray spectrum of the afterglow of GRB 000214 (``Valentine's Day Burst'') observed by BeppoSAX. An emission line feature was observed with a centroid energy of 4.7+/-0.2 keV which, if interpreted as Kα emission from hydrogen-like iron, corresponds to a redshift of z=0.47. The intensity (EW ~ 2 keV) and duration (tens of hours) of the line give information on the distance, from the burst region, of the emitting material (R>=3*E15 cm) and its mass (M>=0.7Msun). We show that these results are not easily reconciled with the binary merger and hypernova models for gamma ray bursts.

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