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Title:
Stacking gravitational wave signals from soft gamma repeater bursts
Authors:
Kalmus, P.; Cannon, K. C.; Márka, S.; Owen, B. J.
Affiliation:
AA(California Institute of Technology, Pasadena, California 91125, USA; Columbia University, New York, New York 10027, USA), AB(California Institute of Technology, Pasadena, California 91125, USA), AC(Columbia University, New York, New York 10027, USA), AD(Institute for Gravitation and the Cosmos, Center for Gravitational Wave Physics, and Department of Physics, The Pennsylvania State University, University Park, Pennsylvania 16802, USA)
Publication:
Physical Review D, vol. 80, Issue 4, id. 042001 (PhRvD Homepage)
Publication Date:
08/2009
Origin:
APS
PACS Keywords:
Gravitational wave detectors and experiments, Data analysis: algorithms and implementation; data management, Gravitational radiation, magnetic fields, and other observations
DOI:
10.1103/PhysRevD.80.042001
Bibliographic Code:
2009PhRvD..80d2001K

Abstract

Soft gamma repeaters (SGRs) have unique properties that make them intriguing targets for gravitational wave (GW) searches. They are nearby, their burst emission mechanism may involve neutron star crust fractures and excitation of quasinormal modes, and they burst repeatedly and sometimes spectacularly. A recent LIGO search for transient GW from these sources placed upper limits on a set of almost 200 individual SGR bursts. These limits were within the theoretically predicted range of some models. We present a new search strategy which builds upon the method used there by “stacking” potential GW signals from multiple SGR bursts. We assume that variation in the time difference between burst electromagnetic emission and burst GW emission is small relative to the GW signal duration, and we time-align GW excess power time-frequency tilings containing individual burst triggers to their corresponding electromagnetic emissions. Using Monte Carlo simulations, we confirm that gains in GW energy sensitivity of N1/2 are possible, where N is the number of stacked SGR bursts. Estimated sensitivities for a mock search for gravitational waves from the 2006 March 29 storm from SGR 1900+14 are also presented, for two GW emission models, “fluence-weighted” and “flat” (unweighted).
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