The Effectiveness of the HETE-2 Triggering Algorithm

Details The Effectiveness of the HETE-2 Triggering Algorithm The Effectiveness of the HETE-2 Triggering Algorithm

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aipc..662...97t&link_type=abstract

GAMMA-RAY BURST AND AFTERGLOW ASTRONOMY 2001: A Workshop Celebrating the First Year of the HETE Mission. AIP Conference Proceed

Astronomy and Astrophysics

Astronomy

1

Gamma-Ray Sources, Gamma-Ray Bursts, Observation And Data Reduction Techniques, Computer Modeling And Simulation, Spaceborne And Space Research Instruments, Apparatus, And Components

Scientific paper

We determine the most effective trigger criteria for detecting GRBs on HETE-2. Our simulations include a full Monte Carlo tracking of the photons through the instrument, as well as randomly selected BATSE bursts. The HETE-2 flight triggering algorithm runs about thirty different triggers simultaneously. These criteria range from the traditional trigger style that uses one background which is located before the moment of interest (the potential burst), to most of the current HETE-2 criteria which include two backgrounds which bracket the moment of interest. The dual background style allows the software to be more effective when dealing with trends in the HETE-2 backgrounds. As a result, we have been able to set the threshold of the triggers to less than half of what has been used in previous experiments such as BATSE. Our simulations show that bracketed triggers give HETE-2 almost three times as many triggered GRBs and 23% more correct localizations than traditional trigger criteria run on the same gamma ray bursts. We have also shown that our new trigger set on HETE-2 finds 5% more gamma-ray bursts and produces 11% more correct on-board localizations than the previous set we ran on the satellite.

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