Many astrophysical phenomena are foreseen to emit GW transient signal with long duration (since few up to few hundreds seconds), such as fallback accretion, accretion disk instabilities, nonaxisymmetric deformations in magnetars. The theoretical predictions for those astrophysical processes cover a wide range of signal morphologies and in most cases are poorly known. In such cases, we need unmodeled search techniques.
We report on results of unmodeled long-duration transient searches in the third observing run of Advanced LIGO and Advanced Virgo. The search is performed using minimal assumptions and covers the range of 2s-500s duration in the frequency band of 24Hz-2048Hz. We use three different algorithms to improve detection capability and coverage of search parameter space thanks to different assumptions and data handling techniques.