Using Wavelets to Search Swift GRBs for QPOs

Journal Article · Fri Oct 15 00:00:00 EDT 2010 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3509323· OSTI ID:21439600

Morris, David; Battista, Fred; Dhuga, Kalvir; MacLachlan, Glen ^[1]

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1. George Washington University (United States)

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.

• OSTI ID: 21439600
• Journal Information: AIP Conference Proceedings, Vol. 1279, Issue 1; Conference: Conference on deciphering the ancient universe with gamma-ray bursts, Kyoto (Japan), 19-23 Apr 2010; Other Information: DOI: 10.1063/1.3509323; (c) 2010 American Institute of Physics; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
ASTROPHYSICS
CORRELATION FUNCTIONS
COSMIC GAMMA BURSTS
GAMMA ASTRONOMY
GAMMA DETECTION
NOISE
OSCILLATIONS
PERIODICITY
RED SHIFT
WAVE EQUATIONS
ASTRONOMY
COSMIC RADIATION
DETECTION
DIFFERENTIAL EQUATIONS
EQUATIONS
FUNCTIONS
IONIZING RADIATIONS
PARTIAL DIFFERENTIAL EQUATIONS
PHYSICS
PRIMARY COSMIC RADIATION
RADIATION DETECTION
RADIATIONS
VARIATIONS