Short-Bright GRBs: spectral properties

Details Short-Bright GRBs: spectral properties Short-Bright GRBs: spectral properties

2003-12-11

arxiv.org/abs/astro-ph/0312294v1

Astronomy and Astrophysics

Astrophysics

4 pages, 4 figures. To appear in the proceedings of the 2003 GRB Conference (Santa Fe, NM, 2003 Sep 8-12)

Scientific paper

10.1063/1.1810803

We study the spectra of short-bright GRBs detected by BATSE and compare them with the average and time resolved spectral properties of long-bright bursts. We confirm that short events are harder than long bursts, as already found from the comparison of their (fluence) hardness ratio, but we find that this difference is mainly due to a harder low energy spectral component present in short bursts, rather than to a (marginally) different peak energy. Moreover, we find that short GRBs are similar to the first 1 sec emission of long bursts. The comparison of the energetic of short and long bursts also suggests that short GRBs do not obey the peak energy--equivalent isotropic energy correlation recently proposed for long events, implying that short GRBs emit lower energy than long ones. Nonetheless, short bursts seem to emit a luminosity similar to long GRBs and under such hypothesis their redshift distribution appears consistent with that observed for long events. These findings might suggest the presence of a common mechanism at the beginning of short and long bursts which operates on different timescales in the these two classes.

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