Astron. Astrophys. Suppl. Ser. 138, 409-412
M. Schmidt
Send offprint request: M. Schmidt
California Institute of Technology, Pasadena, CA 91125, U.S.A
e-mail: mxs@deimos.caltech.edu
Received January 21; accepted February 28, 1999
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 
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 s 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.
Key words: gamma-ray bursts
Copyright The European Southern Observatory (ESO)
