A Search for Nontriggered Gamma-Ray Bursts in the BATSE Continuous Records: First Results
Abstract
An off-line scan for nontriggered gamma-ray bursts (GRBs) in the BATSE daily records at 1024 ms time resolution covering about 7 yr of observations gave 1353 nontriggered and 1581 triggered GRBs. The scan efficiency was measured by adding artificial test bursts to the data. The logN-logP distribution could be extended down to peak fluxes, P~0.1 photons cm-2 s-1. Previous indications of a turnover at small P are not confirmed. The logN-logP distribution cannot be fitted with a standard candle model with a nonevolving GRB source population, assuming that there are no large non-GRB contaminations. It is likely that the intrinsic luminosity function of GRBs is wide.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- September 2000
- DOI:
- 10.1086/312873
- arXiv:
- arXiv:astro-ph/9903094
- Bibcode:
- 2000ApJ...540L..21S
- Keywords:
-
- Gamma Rays: Bursts;
- Methods: Data Analysis;
- Astrophysics
- E-Print:
- 4 pages, LaTeX, to appear in Proceedings "Gamma Ray Bursts in the Afterglow Era", Rome, November 1998, A&