The Non-triggered Supplement to the BATSE Gamma-ray Burst Catalogs

Details The Non-triggered Supplement to the BATSE Gamma-ray Burst Catalogs The Non-triggered Supplement to the BATSE Gamma-ray Burst Catalogs

Dec 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...193.7907k&link_type=abstract

American Astronomical Society, 193rd AAS Meeting, #79.07; Bulletin of the American Astronomical Society, Vol. 30, p.1373

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The Burst and Transient Source Experiment (BATSE) onboard the Compton Gamma Ray Observatory detects gamma-ray bursts (GRBs) and other astronomical transients using a real-time burst detection (or ``trigger'') system running onboard the spacecraft. I describe a search of 6 years of archival BATSE data for GRBs and other transients that were not detected by the onboard system. The result is a catalog of ``non-triggered'' GRBs. This catalog increases the number of GRBs detected with BATSE by 48% during the time period of the search. The intensity distribution of the GRBs detected with our search (both triggered and non-triggered) reaches peak fluxes that are a factor of ~ 2 lower than could be studied previously. The mean value of the V/Vmax statistic for these bursts is 0.177 +/- 0.006. This is the lowest value so far obtained for a global sample of GRBs. The differential peak flux distribution is consistent with cosmological models in which the co-moving gamma-ray burst rate approximately traces the star formation history of the Universe. These results suggest that more sensitive detectors are likely to discover relatively few ``classical'' GRBs fainter than the BATSE detection threshold.

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