Ghirlanda 2007 短暴的硬度与距离

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astro-ph/0701448 [abs, ps, pdf, other] :

Title: On the spectra and distance scale of short Gamma Ray--Bursts
Authors: Giancarlo Ghirlanda (INAF - Osservatorio Astronomico di Brera)
Comments: To be published in the proceedings of the conference "SWIFT and GRBs: Unveiling the Relativistic Universe", Venice, June 5-9, 2006. To appear in "Il Nuovo Cimento"

I discuss the spectral properties of short GRBs detected by BATSE and compare them with long events. The detailed modeling of short GRB spectra shows that their being (on average) harder than long events (as it has been found by comparing their hardness ratios) is indeed due to a harder low energy spectral component (i.e. the powerlaw of the Band or cutoff-powerlaw model) in short GRBs which, instead, have a peak energy similar to long events. Another open issue is the distance scale to short GRBs. While the few redshift measurements suggests that they are at z<1,>