Anomalous grouping of some short BATSE GRBs
Z. Bagoly, L. G. Balazs, P. Veres, A. Meszaros, I. Horvath
TL;DR
This study analyzes the power spectra of short BATSE gamma-ray bursts, identifying a subset with unusual harmonic features and a significant dipole distribution, suggesting potential anisotropy in their origins.
Contribution
It introduces a novel analysis of harmonic power in short GRBs and reveals a significant anisotropic sky distribution of certain bursts.
Findings
22 GRBs with high harmonic power above 0.03 Hz
Strong dipole moment in sky distribution with 99.994% significance
Potential anisotropy in the spatial distribution of these GRBs
Abstract
The power spectra of 457 short BATSE bursts were analyzed, focusing on the 64 ms lightcurves' tails in the low energy bands. Using MC simulations, 22 GRBs were identified with unusually high harmonic power above 0.03 Hz. The sky distribution of these bursts shows an extraordinarily strong dipole moment with a 99.994% significance.
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Taxonomy
TopicsParticle physics theoretical and experimental studies · Gamma-ray bursts and supernovae · Quantum Chromodynamics and Particle Interactions