Lazzati 2009 短暴可能只不过是长暴的偏轴观测

主要内容:
还说时标，红移分布，余辉都是吻合的。
不过也提出超新星等的观测还没有发现。
（估计是错的。）

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Title:		Short-duration Gamma-ray Bursts From Off-axis Collapsars
Authors:		Lazzati, Davide; Morsony, Brian J.; Begelman, Mitchell C.
Affiliation:		AA(Department of Physics, NC State University, 2401 Stinson Drive, Raleigh, NC 27695-8202, USA davide_lazzati@ncsu.edu), AB(Department of Astronomy, University of Wisconsin-Madison, 5534 Sterling Hall, 475 North Charter Street, Madison, WI 53706-1582, USA ), AC(JILA, University of Colorado, 440 UCB, Boulder, CO 80309-0440, USA ; Department of Astrophysical and Planetary Sciences, University of Colorado, 391 UCB, Boulder, CO 80309-0391, USA)
Publication:		The Astrophysical Journal, Volume 717, Issue 1, pp. 239-244 (2010). (ApJ Homepage)
Publication Date:		07/2010
Origin:		IOP
ApJ Keywords:		gamma-ray burst: general, hydrodynamics, relativistic processes
DOI:		10.1088/0004-637X/717/1/239
Bibliographic Code:		2010ApJ...717..239L

Abstract

We present two-dimensional (2D) high-resolution hydrodynamic simulations of the relativistic outflows of long-duration gamma-ray burst (GRB) progenitors. We analyze the properties of the outflows at wide off-axis angles, produced by the expansion of the hot cocoon that surrounds the jet inside the progenitor star. We find that the cocoon emission at wide angles may have properties similar to those of the subclass of short-duration GRBs with persistent X-ray emission. We compute the predicted duration distribution, redshift distribution, and afterglow brightness, and we find that they are all in agreement with the observed properties of short GRBs with persistent emission. We suggest that a supernova component, the properties of the host galaxies, and late afterglow observations can be used as a crucial test to verify this model.

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