Gamma-Ray Bursts Detected From BATSE DISCLA Data

Abstract

We have searched for gamma-ray bursts (GRB) in the BATSE DISCLA data covering the period TJD 8365-10528. We employ an algorithm that uses the background both before and after the onset of the burst, and that requires an excess of at least 5 sigma over background in the energy range 50-300 keV. For the initial set of 7536 triggers, we find strong concentrations at given geographic locations of the satellite. After excluding these geographic areas, we are left with 4485 triggers. We exclude triggers close in position to solar flares, CygX-1, and Nova Persei 1992 when active, as well as soft bursts close to the sun. We accept 1018 triggers that occur within 230 sec of a GRB listed in the BATSE catalog, and upon visual inspection classify 881 triggers as magnetospheric events and 404 as GRBs. The final sample of 1422 GRBs represents effectively 2.0 years of isotropic exposure, for an annual rate of 710 GRBs per year.

4 pages, 3 figures, Astronomy & Astrophysics Suppl. Ser. in press, proceedings of the Workshop "Gamma Ray Bursts in the Afterglow Era" held in Rome, November 1998

Cited by in corpus (10)

• Luminosity Function of Gamma-Ray Bursts Derived Without Benefit of Redshifts
• How Sample Completeness Affects Gamma-Ray Burst Classification
• An Off-line Scan of the BATSE Daily Records and a Large Uniform Sample of Gamma-Ray Bursts
• Luminosities and Space Densities of Short Gamma-Ray Bursts
• Redshift distribution and luminosity function of long gamma-ray bursts from cosmological simulations
• Search for Non-Triggered Gamma Ray Bursts in the BATSE Continuous Records: Preliminary Results
• The Decline of the Source Population of Gamma-Ray Bursts and Their Luminosity Function
• A calorimetric test for Kerr black holes in gamma-ray bursts
• The GUSBAD Catalog of Gamma-Ray Bursts
• Are Supershells Powered by Multiple Supernovae? Modeling the Radio Pulsar Population Produced by OB Associations