2002/01/08 by Ya. Tikhomirova, Ya. Yu. Tikhomirova, Tikhomirova, Ya. +5
Mathematics · Physics and Astronomy · #Astrophysics (astro-ph) #FOS: Physical sciences #Gamma-ray bursts and supernovae #Statistical and numerical algorithms #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/0201108
6 pages, 3 figures, 2 tables, submitted to MNRAS
arxiv created 2002/01/08 · openalex publication_date 2002/01/08 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
There still exists the possibility that the phenomenon of gamma-ray bursts (GRBs) is a mixture of events of different nature, even within the class of long (>2 s) bursts. We try to put statistical constraints on a possible non-cosmological component using the uniform GRB catalog of Stern & Tikhomirova obtained from an overall scan of the full 9.1 year BATSE 1024 ms data. The sample consists of 3906 GRBs and includes non-triggered bursts with peak fluxes down to 0.1 photons cm-2 s-1. We find no significant deviations from isotropy. The constraints on a non-cosmological population are still weak. The allowed contribution of a GRB subpopulation originating from an extended galactic halo is about 60% and the upper limit on an Eucledian component (e.g., nearby galactic or non-cosmological extragalactic GRBs) is 23%. The results concern mainly the class of long GRBs.