Zhang, Fu-Wen 2012 Fermi暴的长短暴统计

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Title:		Revisiting the Long/Soft-Short/Hard Classification of Gamma-Ray Bursts in the Fermi Era
Authors:		Zhang, Fu-Wen; Shao, Lang; Yan, Jing-Zhi; Wei, Da-Ming
Publication:		eprint arXiv:1201.1549
Publication Date:		01/2012
Origin:		ARXIV
Keywords:		Astrophysics - High Energy Astrophysical Phenomena
Comment:		26 pages, 9 figures
Bibliographic Code:		2012arXiv1201.1549Z

Abstract

We perform a statistical analysis of the temporal and spectral properties of the latest Fermi gamma-ray bursts (GRBs) to revisit the classification of GRBs. We find that the bimodalities of duration and the energy ratio (Epeak/Fluence) and the anti-correlation between spectral hardness (hardness ratio (HR), peak energy and spectral index) and duration (\Delta T) support the long/soft-short/hard classification scheme for Fermi GRBs. The HR - \Delta T anti-correlation strongly depends upon the spectral shape of GRBs and energy bands, and the bursts with the curved spectra in the typical BATSE energy bands show a tighter anti-correlation than those with the power-law spectra in the typical BAT energy bands. This might explain why the HR - \Delta T correlation is not evident for those GRB samples detected by instruments with a narrower/softer energy bandpass. We also analyze the intrinsic energy correlation for the GRBs with measured redshift and well defined peak energies. The current sample suggests Ep,rest=2455 \times (Eiso/10^{52})^{0.59} for short GRBs, significantly different from that for long GRBs. However, both the long and short GRBs comply with the same Ep,rest-Liso correlation.

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