منابع مشابه
Short-Hard Gamma-Ray Bursts
Two types of Gamma-ray bursts (GRBs) are observed: short duration hard spectrum GRBs and long duration soft spectrum GRBs. For many years long GRBs were the focus of intense research while the lack of observational data limited the study of short-hard GRBs (SHBs). In 2005 a breakthrough occurred following the first detections of SHB afterglows, longer wavelength emission that follows the burst ...
متن کاملShort-Duration Gamma-Ray Bursts
Gamma-ray bursts (GRBs) display a bimodal duration distribution, with a separation between the shortand long-duration bursts at about 2 sec. The progenitors of long GRBs have been identified as massive stars based on their association with Type Ic core-collapse supernovae, their exclusive location in starforming galaxies, and their strong correlation with bright ultraviolet regions within their...
متن کاملA Unified Model of Short and Long Gamma-Ray Bursts, X-Ray Rich Gamma-Ray Bursts, and X-Ray Flashes
Taking into account the recent suggestion that a short gamma-ray burst (GRB) looks like the first 1 sec of a long GRB, we propose that the jet of a GRB consists of multiple sub-jets or sub-shells (i.e., an inhomogeneous jet model). The multiplicity of the sub-jets along a line of sight ns is an important parameter. If ns is large (≫ 1) the event looks like a long GRB, while if ns is small (∼ 1)...
متن کاملFlares In Long And Short Gamma Ray Bursts
The many similarities between the prompt emission pulses in gamma ray bursts (GRBs) and X-ray flares during the fast decay and afterglow phases of GRBs suggest a common origin. In the cannonball (CB) model of GRBs, this common origin is mass accretion episodes of fall-back matter on a newly born compact object. The prompt emission pulses are produced by bipolar ejections of highly relativistic ...
متن کاملTemporal properties of short and long gamma-ray bursts
Abstract. A temporal analysis was performed on a sample of 100 bright short GRBs with T90<2s from the BATSE Current Catalog along with a similar analysis on 319 long bright GRBs with T90>2s from the same catalog. The short GRBs were denoised using a median filter and the long GRBs were denoised using a wavelet method. Both samples were subjected to an automated pulse selection algorithm to obje...
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ژورنال
عنوان ژورنال: Journal of High Energy Astrophysics
سال: 2015
ISSN: 2214-4048
DOI: 10.1016/j.jheap.2015.04.002