Norris 2009 短暴的低能延伸辐射

主要内容:
BATSE有些（1/4）短暴伴随有低能的延伸辐射（能段低的时标长），和Swift的比较（swift的能段低一些），发现这种延伸只到一定的程度，而不会一直延伸。

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Title:		Threshold for Extended Emission in Short Gamma-ray Bursts
Authors:		Norris, Jay P.; Gehrels, Neil; Scargle, Jeffrey D.
Affiliation:		AA(Physics and Astronomy Department, University of Denver, Denver, CO 80208, USA ), AB(Astroparticle Physics Laboratory, NASA/Goddard Space Flight Center, Greenbelt, MD 20771, USA ), AC(Space Science and Astrobiology Division, NASA/Ames Research Center, Moffett Field, CA 94035-1000, USA)
Publication:		The Astrophysical Journal, Volume 717, Issue 1, pp. 411-419 (2010). (ApJ Homepage)
Publication Date:		07/2010
Origin:		IOP
ApJ Keywords:		gamma-ray burst: general, methods: data analysis
DOI:		10.1088/0004-637X/717/1/411
Bibliographic Code:		2010ApJ...717..411N

Abstract

The initial pulse complex (IPC) in short gamma-ray bursts is sometimes accompanied by a softer, low-intensity extended emission (EE) component. In cases where such a component is not observed, it is not clear if it is present but below the detection threshold. Using Bayesian Block (BB) methods, we measure the EE component and show that it is present in one-quarter of a Swift/BAT sample of 51 short bursts, as was found for the Compton/BATSE sample. We simulate bursts with EE to calibrate the BAT threshold for EE detection and show that this component would have been detected in nearly half of BAT short bursts if it were present, to intensities ~10^-2 counts cm^-2 s^-1, a factor of 5 lower than actually observed in short bursts. In the BAT sample, the ratio of average EE intensity to IPC peak intensity, R _int, ranges over a factor of 25, R _int ~ 3 × 10^-3 to 8 × 10^-2. In comparison, for the average of the 39 bursts without an EE component, the 2σ upper limit is R _int < 8 × 10^-4. These results suggest that a physical threshold effect operates near R _int ~ few × 10^-3 below which the EE component is not manifest.

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