Using Wavelets to Search Swift GRBs for QPOs

Details Using Wavelets to Search Swift GRBs for QPOs Using Wavelets to Search Swift GRBs for QPOs

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aipc.1279..394m&link_type=abstract

DECIPHERING THE ANCIENT UNIVERSE WITH GAMMA-RAY BURSTS. AIP Conference Proceedings, Volume 1279, pp. 394-396 (2010).

Astronomy and Astrophysics

Astronomy

Gamma-Ray Sources (Astronomical), Redshift, Wave Equations, Gamma-Ray Sources, Gamma-Ray Bursts, Distances, Redshifts, Radial Velocities, Spatial Distribution Of Galaxies, Relativistic Wave Equations

Scientific paper

Motivated by discussion of possible quasi-periodic oscillations in GRB090709A, we examine the wavelet transform of GRB090709A for evidence of the purported QPO. Our approach accounts for both white noise and red noise, with the red noise based on the auto-correlation function of the GRB090709A lightcurve. Encouraged by the robustness of the result, we repeat the analysis on all Swift-triggered GRBs, treating the red noise properties of each GRB individually. We find that time-integrated wavelet peak power agrees well with peak power derived from FFT techniques but the wavelet technique suggests the power is often localized early in the burst.

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