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A method is described for the detection and estimation of transient chirpsignals that are characterized by smoothly evolving, but otherwise unmodeled,amplitude envelopes and instantaneous frequencies. Such signals areparticularly relevant for gravitational wave searches, where they may arise ina wide range of astrophysical scenarios. The method uses splines withcontinuously adjustable breakpoints to represent the amplitude envelope andinstantaneous frequency of a signal, and estimates them from noisy data usingpenalized least squares and model selection. Simulations based on waveformsspanning a wide morphological range show that the method performs well in asignal-to-noise ratio regime where the time-frequency signature of a signal ishighly degraded, thereby extending the coverage of current unmodeledgravitational wave searches to a wider class of signals.

Spline Based Search Method For Unmodeled Transient Gravitational Wave Chirps