Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-04-06
AIP Conf.Proc.921:548-549,2007
Astronomy and Astrophysics
Astrophysics
2 pages. To appear in the Proceedings of the First International GLAST Symposium, Febuary 5-8, 2007, Stanford University, AIP,
Scientific paper
10.1063/1.2757445
The light curves produced by all-sky monitors, such as the Rossi X-ray Timing Explorer All-Sky Monitor and the Swift Burst Alert Telescope (BAT), generally have non-uniform error bars. In searching for periodic modulation in this type of data using power spectra it can be important to use appropriate weighting of data points to achieve the best sensitivity. It was recently demonstrated that for Swift BAT data a simple weighting scheme can actually sometimes reduce the sensitivity of the power spectrum depending on source brightness. Instead, a modified weighting scheme, based on the Cochran semi-weighted mean, gives improved results independent of source brightness. We investigate the benefits of weighting power spectra in period searches using simulated GLAST LAT observations of gamma-ray binaries.
Corbet Robin
Dubois Richard
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