On multiple classes of gamma-ray bursts, as deduced from autocorrelation functions or bivariate duration/hardness ratio distributions

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dc.contributor.authorKoen, Chris
dc.contributor.authorBere, A.
dc.date.accessioned2013-10-20T21:13:55Z
dc.date.available2013-10-20T21:13:55Z
dc.date.issued2012
dc.description.abstractAutocorrelation functions (ACFs) of 119 gamma-ray bursts (GRBs) monitored by the Burst Alert Telescope (BAT) on Swift are calculated. Contrasting with previous results for smaller numbers of bursts from other missions, the widths of the ACFs are not bimodally distributed. Although the distribution appears slightly asymmetrical, underlying mixtures of distributions can also probably be ruled out. Factors contributing to differences between the results presented here, and those in the literature, may include the differences in energy passbands used, and the superior sensitivity of the BAT instrument (which affects e.g. the redshift distribution of the detected GRB). The second part of the paper is concerned with the fitting of mixtures of bivariate Gaussians to the joint duration/hardness ratio data of 325 GRBs. A careful analysis confirms that a three-component mixture is the statistically most acceptable, but it is shown that the implied marginal distribution of the hardness ratios does not fit the data very well. It is also stressed that mixture components cannot automatically be assumed to represent different classes of GRBs. The point is illustrated by showing two substantially different, but statistically almost equivalent, mixture models for the distribution of 571 BAT-determined GRB durations.en_US
dc.description.accreditationWeb of Scienceen_US
dc.identifier.citationKoen, C. & Bere, A. (2012). On multiple classes of gamma-ray bursts, as deduced from autocorrelation functions or bivariate duration/hardness ratio distributions. Monthly Notices of the Royal Astronomical Society, 420: 405–415en_US
dc.identifier.issn0035-8711
dc.identifier.urihttp://hdl.handle.net/10566/777
dc.language.isoenen_US
dc.privacy.showsubmitterfalse
dc.publisherOxford University Pressen_US
dc.rights© 2012 copyright Oxford University Press. This file may be freely used for educational purposes, as long as it is not altered in any way. Acknowledgement of the authors and the source is required.
dc.source.urihttp://dx.doi.org/10.1111/j.1365-2966.2011.20045.x
dc.status.ispeerreviewedtrue
dc.subjectMethods: statisticalen_US
dc.subjectGamma-ray burst: generalen_US
dc.titleOn multiple classes of gamma-ray bursts, as deduced from autocorrelation functions or bivariate duration/hardness ratio distributionsen_US
dc.typeArticleen_US

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