Threshold effects on V/V(max) for gamma-ray bursts

Details Threshold effects on V/V(max) for gamma-ray bursts Threshold effects on V/V(max) for gamma-ray bursts

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993ap%26ss.201..347h&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 201, no. 2, p. 347-358.

Astronomy and Astrophysics

Astronomy

9

Gamma Ray Astronomy, Gamma Ray Bursts, Angular Distribution, Astronomical Models, Gamma Ray Observatory, Heliosphere, Spaceborne Astronomy, Spatial Distribution

Scientific paper

The interpretation of the observed gamma-ray burst V/V(max) statistic in terms of spatial distributions is model-dependent. Detection of gamma-ray bursts requires the counting rate in one or more detectors to exceed a threshold C(lim) determined from a time-dependent background rate B(t). The sampling depth of the burst detector is thus time-dependent, and, if burst sources are nonuniform in space, the observed V/V(max) distribution will be affected by B(t). We demonstrate this effect with a simple geometric distribution of standard candles and argue that V/V(max) statistic without information on threshold variations is insufficient for rigorous data analysis. Peak count rates and threshold values must be given separately for all events in order to facilitate a meaningful comparison of observations with theoretical distribution models.

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