Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.1008f&link_type=abstract
American Astronomical Society, AAS Meeting #211, #10.08; Bulletin of the American Astronomical Society, Vol. 39, p.743
Astronomy and Astrophysics
Astronomy
Scientific paper
The gamma-ray burst / X-ray flash events 031203, discovered by INTEGRAL, and 060218, discovered by Swift, represent two of only five GRB-supernovae with optical spectroscopic confirmation of their supernova components. Yet their observed high-energy properties offer a sharp contrast: While GRB 031203 was detected as a short 40-s burst with a spectrum peaking at ˜90; keV, XRF 060218 was a >2000-s long, smoothly evolving burst with a peak energy of 4.9 keV. At the same time, the observation of an evolving dust-scattered X-ray halo following GRB 031203 has been used to argue that this event was actually an X-ray flash. Taking this observation as our starting point, we investigate the intriguing question of whether the 031203 and 060218 events might in fact have been ``cosmic twins'' with nearly-identical high-energy properties.
Feng Lu
Fox Daniel
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