## Search

Now showing items 1-10 of 21

#### Multiple regression of GRB luminosity on light-curve properties

(Oxford University Press, 2009)

Statistical relations between the luminosity L of gamma-ray burster (GRBs) and several of
their other observable properties have been discovered. Four of these properties are considered
here: the spectral lag; a measure ...

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

(Oxford University Press, 2012)

Autocorrelation 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, ...

#### Estimation of the coherence time of stochastic oscillations from modest samples

(Oxford University Press, 2012)

‘Quasi-periodic’ or ‘solar-like’ oscillations can be described by three parameters – a characteristic
frequency, a coherence time (or ‘quality factor’) and the variance of the random
driving process. This paper is concerned ...

#### Fitting power-law distributions to data with measurement errors

(Oxford University Press, 2009)

If X, which follows a power-law distribution, is observed subject to Gaussian measurement
error e, thenX+e is distributed as the convolution of the power-lawand Gaussian distributions.
Maximum-likelihood estimation of ...

#### Fitting sinusoids to observations of rotating spotted stars

(Oxford University Press, 2007)

It is assumed that K blocks (e.g. seasons) of observations are available, and the parameters
characterizing a fixed-frequency sinusoidal variability (mean light level, amplitude, phase)
are constant within each of the ...

#### Statistical tests for changes in the amplitude, frequency or phase of a sinusoidal variation

(Oxford University Press, 2009)

The problem considered is that of testing for small changes over time in the properties of
a sinusoidal signal contaminated by noise. Two test statistics are proposed. The first is a
frequency domain statistic based on ...

#### Predicting gamma-ray burster redshifts from their prompt emission properties

(Oxford University Press, 2010)

This paper presents a study of the relation between gamma-ray burster redshift and several
of its prompt emission properties (spectral lag, light curve variability, peak energy, rise time
and the peak bolometric flux ...

#### Multivariate comparisons of the period–light-curve shape distributions of Cepheids in five galaxies

(Oxford University Press, 2007)

A number of published tests suitable for the comparison of multivariate distributions are
described. The results of a small power study, based on realistic Cepheid log period – Fourier
coefficient data, are presented. ...

#### The Nyquist frequency for irregularly spaced time-series: a calculation formula

(Oxford University Press, 2006)

Eyer & Bartholdi showed that the Nyquist frequency of irregularly sampled time-series can
be very high. In this paper, a calculation formula for the Nyquist frequency is presented. In
practice there is an upper limit of ...

#### Time series models of three sets of RXTE Observations of 4U 1543-47

(Oxford University Press, 2013)

The X-ray nova 4U 1543−47 was in a different physical state (low/hard, high/soft, and very high) during the
acquisition of each of the three time series analyzed in this paper. Standard time series models of the ...