Periodicities in gamma-ray burst light curves

Details Periodicities in gamma-ray burst light curves Periodicities in gamma-ray burst light curves

Apr 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...195..123s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 195, no. 1-2, April 1988, p. 123-128.

Astronomy and Astrophysics

Astrophysics

5

Fourier Transformation, Gamma Ray Bursts, Light Curve, Periodic Variations, Stellar Oscillations, Low Frequencies, Random Processes

Scientific paper

Only one case is known where a gamma-ray burst (GRB) light curve indisputably exhibits a periodic behavior. However, a number of GRB light curves have claims for periodicity of varying degrees of plausibility. A vital part of each claim is some mathematical calculation of the significance of the period when compared to some appropriate hypothesis where no modulation is present. For the period search techniques of Fourier transforms, periodograms, and model fitting, well known statistical procedures allow the significance to be evaluated. However, a fourth period search technique, so called "pattern recognition", does not have any published means of estimating confidence levels. The authors present here a series of Monte Carlo calculations which allow for the judging of a period's significance. These results are then applied to periods proposed for sixteen bursts.

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