3 research outputs found
Factor analysis of the spectral and time behavior of long GRBs
A sample of 197 long BATSE GRBs is studied statistically. In the sample 11
variables, describing for any burst the time behavior of the spectra and other
quantities, are collected. The application of the factor analysis on this
sample shows that five factors describe the sample satisfactorily. Both the
pseudo-redshifts coming from the variability and the Amati-relation in its
original form are disfavored.Comment: In GAMMA-RAY BURSTS 2007: Proceedings of the Santa Fe Conferenc
New Statistical Results on the Angular Distribution of Gamma-Ray Bursts
We presented the results of several statistical tests of the randomness in
the angular sky-distribution of gamma-ray bursts in BATSE Catalog. Thirteen
different tests were presented based on Voronoi tesselation, Minimal spanning
tree and Multifractal spectrum for five classes (short1, short2, intermediate,
long1, long2) of gamma-ray bursts, separately. The long1 and long2 classes are
distributed randomly. The intermediate subclass, in accordance with the earlier
results of the authors, is distributed non-randomly. Concerning the short
subclass earlier statistical tests also suggested some departure from the
random distribution, but not on a high enough confidence level. The new tests
presented in this article suggest also non-randomness here.Comment: in GAMMA-RAY BURSTS 2007: Proceedings of the Santa Fe Conferenc