Angular distribution of GRBs

L. G. Balázs, A. Mészáros, I. Horváth, Z. Bagoly, P. Veres, G. Tusnády

Research output: Contribution to journalArticle

Abstract

We studied the complete randomness of the angular distribution of BATSE gamma-ray bursts (GRBs). Based on their durations and peak fluxes, we divided the BATSE sample into 5 subsamples (short1, short2, intermediate, long1, long2) and studied the angular distributions separately. We used three methods to search for non-randomness in the subsamples: Voronoi tesselation, minimal spanning tree, and multifractal spectra. To study any non-randomness in the subsamples we defined 13 test-variables (9 from Voronoi tesselation, 3 from the minimal spanning tree and one from the multifractal spectrum). We made Monte Carlo simulations taking into account the BATSE's sky-exposure function. We tested the randomness by introducing squared Euclidean distances in the parameter space of the test-variables. We recognized that the short1, short2 groups deviate significantly (99.90%, 99.98%) from the fully random case in the distribution of the squared Euclidean distances but this is not true for the long samples. In the intermediate group, the squared Euclidean distances also give significant deviation (98.51%).

Original languageEnglish
Pages (from-to)17-25
Number of pages9
JournalActa Polytechnica
Volume52
Issue number2
Publication statusPublished - 2012

ASJC Scopus subject areas

  • Engineering(all)

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    Balázs, L. G., Mészáros, A., Horváth, I., Bagoly, Z., Veres, P., & Tusnády, G. (2012). Angular distribution of GRBs. Acta Polytechnica, 52(2), 17-25.