Testing the intrinsic randomness in the angular distributions of gamma-ray bursts
Abstract
The counts-in-cells and the two-point angular correlation function method are used to test the randomness in the angular distributions of both the all gamma-ray bursts collected in the BATSE Catalog, and also their three subclasses (``short,'' ``intermediate,'' ``long''). The methods eliminate the non-zero sky-exposure function of BATSE instrument. Both tests suggest intrinsic non-randomness for the intermediate subclass; for the remaining three cases we use only the correlation function method. The confidence levels are between 95% and 99.9%. Separating the GRBs into two parts (``dim half'' and ``bright half,'' respectively) we obtain the result that the ``dim'' half shows a non-randomness at the 99.3% confidence level from the counts-in-cells test. .
- Publication:
-
Gamma-ray Bursts, 5th Huntsville Symposium
- Pub Date:
- September 2000
- DOI:
- 10.1063/1.1361516
- arXiv:
- arXiv:astro-ph/9912076
- Bibcode:
- 2000AIPC..526..102M
- Keywords:
-
- 98.70.Rz;
- 98.70.Sa;
- 98.62.Py;
- 98.80.Es;
- gamma-ray sources;
- gamma-ray bursts;
- Cosmic rays;
- Distances redshifts radial velocities;
- spatial distribution of galaxies;
- Observational cosmology;
- Astrophysics
- E-Print:
- 5 pages, 1 figure, contribution in 5th Huntsville Gamma-Ray Burst Symposium Proceedings