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As the Advanced LIGO and Advanced Virgo interferometers, soon to be joined bythe KAGRA interferometer, increase their sensitivity, they detect anever-larger number of gravitational waves with a significant presence of highermultipoles in addition to the dominant $(2, 2)$ multipole. These highermultipoles can be detected with different approaches, such as theminimally-modeled burst search methods, and here we discuss one such approachbased on the coherent WaveBurst pipeline (cWB). During the inspiral phase thehigher multipoles produce chirps whose instantaneous frequency is a multiple ofthe dominant (2, 2) multipole, and here we describe how cWB can be used todetect these spectral features. The search is performed within suitable regionsof the time-frequency representation; their shape is determined by optimizingthe Receiver Operating Characteristics. This novel method has already been usedin the GW190814 discovery paper (Astrophys. J. Lett. 896 L44) and is very fastand flexible. Here we describe in full detail the procedure used to detect the(3,3) multipole in GW190814 as well as searches for other higher multipolesduring the inspiral phase, and apply it to another event that displays highermultipoles, GW190412, replicating the results obtained with different methods.The procedure described here can be used for the fast analysis of highermultipoles and to support the findings obtained with the model-based Bayesianparameter estimates

Minimally-modeled search of higher multipole gravitational-wave radiation in compact binary coalescence