Three Types of Gamma-Ray Bursts

@article{Mukherjee1998ThreeTO,
  title={Three Types of Gamma-Ray Bursts},
  author={Soma Mukherjee and Eric D. Feigelson and G. Jogesh Babu and Fionn Murtagh and Chris Fraley and Adrian E. Raftery},
  journal={The Astrophysical Journal},
  year={1998},
  volume={508},
  pages={314-327}
}
A multivariate analysis of gamma-ray burst (GRB) bulk properties is presented to discriminate between distinct classes of GRBs. Several variables representing burst duration, fluence, and spectral hardness are considered. Two multivariate clustering procedures are used on a sample of 797 bursts from the Third BATSE Catalog, a nonparametric average linkage hierarchical agglomerative clustering procedure validated with Wilks' Λ* and other multivariate analysis of variance tests and a parametric… Expand
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References

SHOWING 1-10 OF 83 REFERENCES
Spectral evolution of a subclass of gamma-ray bursts observed by batse
Among the gamma-ray bursts (GRBs) observed by the Burst and Transient Source Experiment (BATSE) on board the Compton Gamma Ray Observatory we define a subclass of bursts based on similar morphology:… Expand
The continuum spectral characteristics of gamma-ray bursts observed by BATSE
Distributions of the continuum spectral characteristics of 260 bursts in the first Burst and Transient Source Experiment (BATSE) catalog are presented. The data are derived from flux ratios… Expand
The Third BATSE Gamma-Ray Burst Catalog
The Burst and Transient Source Experiment (BATSE) on the Compton Gamma Ray Observatory (CGRO) has triggered on 1122 cosmic gamma-ray bursts between 1991 April 19 and 1994 September 19. These events… Expand
Identification of two classes of gamma-ray bursts
We have studied the duration distribution of the gamma-ray bursts of the first BATSE catalog. We find a bimodality in the distribution, which separates GRBs into two classes: short events (less than… Expand
Evidence for two distinct morphological classes of gamma-ray bursts from their short time scale variability
We have analyzed the 241 bursts for which peak counts (C)max exist in the publicly available Burst and Transient Source Experiment (BATSE) catalog. Introducing peak counts in 1024 ms as a measure of… Expand
Evidence for the Galactic Origin of Gamma-Ray Bursts
We propose a new criterion to divide the classical gamma-ray bursts into two classes on the basis of their distribution in the duration-hardness plane. We study the two proposed classes separately,… Expand
The Identification of Two Different Spectral Types of Pulses in Gamma-Ray Bursts
It is shown in this study that two different types of spectral emission are generally produced in gamma-ray bursts. A subset of bursts is identified that exhibits a marked lack of fluence above 300… Expand
The Hardness-Duration Diagram of Gamma-Ray Bursts
The hardness-duration diagram for gamma-ray bursts still contains undiscovered important information about the intrinsic properties of these phenomena. We analyze these diagrams for the PHEBUS and… Expand
The Long and the Short of Gamma-Ray Bursts
We report evidence from the Third BATSE Gamma-Ray Burst Catalog that long (T90 > 10 s) and short (T90 < 10 s) gamma-ray bursts (GRBs) represent distinct source populations. Their spatial… Expand
Duration distributions of bright and dim BATSE gamma-ray bursts
We have measured the T(sub 90) and T(sub 50) durations of bright and dim gamma-ray bursts detected by the Compton Gamma-Ray Observatory's (CGRO) Burst and Transient Source Experiment (BASTE). The… Expand
...
1
2
3
4
5
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