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The searches of impulsive gravitational waves (GW) in the data of theground-based interferometers focus essentially on two types of waveforms: shortunmodeled bursts and chirps from inspiralling compact binaries. There is roomfor other types of searches based on different models. Our objective is to fillthis gap. More specifically, we are interested in GW chirps with an arbitraryphase/frequency vs. time evolution. These unmodeled GW chirps may be consideredas the generic signature of orbiting/spinning sources. We expect quasi-periodicnature of the waveform to be preserved independent of the physics which governsthe source motion. Several methods have been introduced to address thedetection of unmodeled chirps using the data of a single detector. Thoseinclude the best chirplet chain (BCC) algorithm introduced by the authors. Inthe next years, several detectors will be in operation. The joint coherentanalysis of GW by multiple detectors can improve the sight horizon, theestimation of the source location and the wave polarization angles. Here, weextend the BCC search to the multiple detector case. The method amounts tosearching for salient paths in the combined time-frequency representation oftwo synthetic streams. The latter are time-series which combine the data fromeach detector linearly in such a way that all the GW signatures received areadded constructively. We give a proof of principle for the full sky blindsearch in a simplified situation which shows that the joint estimation of thesource sky location and chirp frequency is possible.

Best network chirplet-chain: Near-optimal coherent detection of unmodeled gravitation wave chirps with a network of detectors