Factor analysis of the long gamma-ray bursts

Abstract

We study statistically 197 long gamma-ray bursts, detected and measured in detail by the BATSE instrument of the Compton Gamma-Ray Observatory. In the sample 10 variables, describing for any burst the time behavior of the spectra and other quantities, are collected. The factor analysis method is used to find the latent random variables describing the temporal and spectral properties of GRBs. The application of this particular method to this sample indicates that five factors and the $\REpk$ spectral variable (the ratio of peak energies in the spectrum) describe the sample satisfactorily. Both the pseudo-redshifts inferred from the variability, and the Amati-relation in its original form, are disfavored.

5 pages, acceptod to A&A

References in corpus (22)

• Intrinsic spectra and energetics of BeppoSAX Gamma-Ray Bursts with known redshifts
• The Ep,i - Eiso correlation in GRBs: updated observational status, re-analysis and main implications
• A Complete Catalog of Swift GRB Spectra and Durations: Demise of a Physical Origin for Pre-Swift High-Energy Correlations
• A Possible Cepheid-Like Luminosity Estimator for the Long Gamma-Ray Bursts
• Is Thermal Emission in Gamma-Ray Bursts Ubiquitous?
• Implications of Lag-Luminosity Relationship for Unified GRB Paradigms
• A 3rd Class of Gamma Ray Bursts?
• Outliers to the Isotropic Energy - Peak Energy Relation in GRBs
• Pulse Width Evolution in GRBs: Evidence for Internal Shocks
• The Epeak-Eiso plane of long Gamma Ray Bursts and selection effects
• Discovery of a tight correlation among the prompt emission properties of long Gamma Ray Bursts
• Cosmological versus Intrinsic: The Correlation between Intensity and the Peak of the nu F_nu Spectrum of Gamma Ray Bursts
• A new definition of the intermediate group of gamma-ray bursts
• Confirming the gamma-ray burst spectral-energy correlations in the era of multiple time breaks
• Further Study of the Gamma-Ray Bursts Duration Distribution
• Spectral analysis of Swift long GRBs with known redshift
• The GRB Variability/Peak Luminosity Correlation: new results
• Interpretations of gamma-ray burst spectroscopy. I. Analytical and numerical study of spectral lags
• The Brightness Distribution of Bursting Sources in Relativistic Cosmologies
• An intrinsic anisotropy in the angular distribution of gamma-ray bursts
• A Principal Component Analysis of the 3B Gamma-Ray Burst Data
• Statistical analysis of BATSE gamma-ray bursts: Self-similarity and the Amati-relation

Cited by in corpus (5)

• The Possible Impact of GRB Detector Thresholds on Cosmological Standard Candles
• Analysis of the duration--hardness ratio plane of gamma-ray bursts using skewed distributions
• Update on Testing the Isotropy of the Properties of Gamma-Ray Bursts
• On the Connection of Gamma-Ray Bursts and X-Ray Flashes in the BATSE and RHESSI Databases
• Latent characterisation of the complete BATSE gamma ray bursts catalogue using Gaussian mixture of factor analysers and model-estimated overlap-based syncytial clustering