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We present the results of a LIGO search for short-duration gravitationalwaves (GWs) associated with the 2006 March 29 SGR 1900+14 storm. A new searchmethod is used, "stacking'' the GW data around the times of individualsoft-gamma bursts in the storm to enhance sensitivity for models in whichmultiple bursts are accompanied by GW emission. We assume that variation in thetime difference between burst electromagnetic emission and potential burst GWemission is small relative to the GW signal duration, and we time-align GWexcess power time-frequency tilings containing individual burst triggers totheir corresponding electromagnetic emissions. We use two GW emission models inour search: a fluence-weighted model and a flat (unweighted) model for the mostelectromagnetically energetic bursts. We find no evidence of GWs associatedwith either model. Model-dependent GW strain, isotropic GW emission energyE_GW, and \gamma = E_GW / E_EM upper limits are estimated using a variety ofassumed waveforms. The stacking method allows us to set the most stringentmodel-dependent limits on transient GW strain published to date. We find E_GWupper limit estimates (at a nominal distance of 10 kpc) of between 2x10^45 ergand 6x10^50 erg depending on waveform type. These limits are an order ofmagnitude lower than upper limits published previously for this storm andoverlap with the range of electromagnetic energies emitted in SGR giant flares.

Stacked Search for Gravitational Waves from the 2006 SGR 1900+14 Storm