A Third Class of Gamma-Ray Bursts?

@article{Horvth1998ATC,
  title={A Third Class of Gamma-Ray Bursts?},
  author={Istv{\'a}n T. Horv{\'a}th},
  journal={The Astrophysical Journal},
  year={1998},
  volume={508},
  pages={757-759}
}
  • I. Horváth
  • Published 1998
  • Physics
  • The Astrophysical Journal
Two classes of gamma-ray bursts have been identified so far, characterized by T90 durations shorter and longer than approximately 2 s. We show here that the BATSE 3B data allow a good fit with three Gaussian distributions in log T90. The χ2 statistic indicates a 40% probability for two-Gaussian fits, whereas the three-Gaussian fit probability is 98%. Using another statistical method, it is argued that the probability that the third class is a random fluctuation is less than 0.02%. 

Tables from this paper

Likelihood Estimation of Gamma Ray Bursts Duration Distribution
Two classes of Gamma Ray Bursts have been identified so far, characterized by T90 durations shorter and longer than approximately 2 seconds. It was shown that the BATSE 3B data allow a good fit withExpand
A further study of the BATSE Gamma-Ray Burst duration distribution
Two classes of gamma-ray bursts have been identified so far, characterized by durations shorter and longer than about 2 s. In 1998 two independent papers indicated the existence of the third class ofExpand
Analysis of the Swift Gamma‐Ray Bursts duration
Two classes of gamma‐ray bursts have been identified in the BATSE catalogs characterized by durations shorter and longer than about 2 seconds. There are, however, some indications for the existenceExpand
Classification of Swift's gamma-ray bursts
Context. Two classes of gamma-ray bursts have been identified in the BATSE catalogs characterized by durations shorter and longer than about 2 seconds. There are, however, some indications for theExpand
How does the shape of gamma-ray bursts’ pulses affect the duration distribution?
  • M. Tarnopolski
  • Physics
  • Monthly Notices of the Royal Astronomical Society
  • 2021
Gamma-ray bursts (GRBs) come in two types, short and long. The distribution of logarithmic durations of long GRBs is asymmetric rather than Gaussian. Such an asymmetry, when modelled with a mixtureExpand
A DISTINCT PEAK-FLUX DISTRIBUTION OF THE THIRD CLASS OF GAMMA-RAY BURSTS: A POSSIBLE SIGNATURE OF X-RAY FLASHES?
Gamma-ray bursts (GRBs) are the most luminous events in the universe. Going beyond the short-long classification scheme, we work in the context of three burst populations with the third group ofExpand
Statistical Evidence for Three Classes of Gamma-Ray Bursts
Two different multivariate clustering techniques, the K-means partitioning method and the Dirichlet process of mixture modeling, have been applied to the BATSE gamma-ray burst (GRB) catalog, toExpand
The duration distribution of Swift Gamma-Ray Bursts
Decades ago two classes of gamma-ray bursts were identified and delineated as having durations shorter and longer than about 2 s. Subsequently indications also supported the existence of a thirdExpand
Analysis of the Duration–Hardness Ratio Plane of Gamma-Ray Bursts Using Skewed Distributions
It was recently shown that the $T_{90}-H_{32}$ distributions of gamma-ray bursts from CGRO/BATSE and Fermi/GBM are well described by a mixture of only two skewed components, making the presumedExpand
Analysis of Fermi gamma-ray burst duration distribution
Two classes of GRBs, short and long, have been determined without any doubts, and are usually prescribed to different physical scenarios. A third class, intermediate in $T_{90}$ durations, has beenExpand
...
1
2
3
4
5
...

References

SHOWING 1-10 OF 10 REFERENCES
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 thanExpand
Three Types of Gamma-Ray Bursts
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 spectralExpand
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 eventsExpand
The first BATSE gamma-ray burst catalog
The Burst and Transient Source Experiment (BATSE) on the Compton Gamma Ray Observatory (CGRO) has triggered on 1637 cosmic gamma-ray bursts between 1991 April 19 and 1996 August 29. These eventsExpand
Cosmological Brightness Distribution FITS of Gamma-Ray Burst Sources
We discuss detailed fits of the BATSE and PVO gamma-ray burst peak-flux distributions with Friedman models taking into account possible density evolution and standard candle or power law luminosityExpand
The 4B BATSE gamma-ray burst catalog
The 4B catalog of gamma-ray bursts includes all BATSE triggered bursts from launch until 29 August 1996. The total number of bursts is 1637, including 515 bursts since the end of the 3B catalog. TheExpand
BATSE Gamma-Ray Burst Line Search. V. Probability of Detecting a Line in a Burst
The physical importance of the apparent discrepancy between the detections by pre-BATSE missions of absorption lines in gamma-ray burst spectra and the absence of a BATSE line detection necessitatesExpand
The Fourth BATSE Gamma-Ray Burst Catalog (Revised)
The Burst and Transient Source Experiment (BATSE) on the Compton Gamma Ray Observatory (CGRO) has triggered on 1637 cosmic gamma-ray bursts between 1991 April 19 and 1996 August 29. These eventsExpand
Numerical Recipes: FORTRAN
TLDR
The Diskette v 2.04, 3.5'' (720k) for IBM PC, PS/2 and compatibles [DOS] Reference Record created on 2004-09-07, modified on 2016-08-08. Expand
Submitted to ApJ
  • 1998