Chapman 2008 短暴两个来源：SGRB和双中子星并和

主要内容:
他们前面已经在astroph上写过这个内容的一篇文章了的.

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文章信息:

arXiv:0802.0008 [ps, pdf, other]

Title: Short gamma-ray bursts from SGR giant flares and neutron star mergers: two populations are better than one

Authors: Robert Chapman (1), Robert S. Priddey (1), Nial R. Tanvir (2) ((1) University of Hertfordshire, UK, (2) University of Leicester, UK)

Comments: 6 pages, 3 figures, 1 table. Submitted to MNRAS

Subjects: Astrophysics (astro-ph)

There is increasing evidence of a local population of short duration Gamma-ray Bursts (sGRB), but it remains to be seen whether this is a separate population to higher redshift bursts. Here we choose plausible Luminosity Functions (LF) for both neutron star binary mergers and giant flares from Soft Gamma Repeaters (magnetars, SGR), and combined with theoretical and observed Galactic intrinsic rates we examine whether a single population alone of progenitors can reproduce both the overall BATSE sGRB number counts and a local population, or whether a dual progenitor population is required. In addition we compare the predicted redshift distribution from our best fit models with the sGRB redshift distribution from the Swift era. We find that only a bimodal population consisting of lower and higher luminosity populations can reproduce both the overall BATSE sGRB number counts and a local population, as well as being consistent with Swift redshifts. Furthermore, the best fit luminosity parameters agree well with the known properties of SGR giant flares and classic short GRBs.