¶ Chirp
The binary black hole mergers GW150914 and GW151226 each created a distinct "chirp" feature in the LIGO Hanford and LIGO Livingston data. Some LIGO searches look specifically for signals that chirp, and follow closely the prediction for mergers of black holes and/or neutron stars following Einstein's equations. The Gravity Spy data set likely contains some true gravitational-wave signals (we have no way to "turn off" gravitational-waves in our detectors, and there are likely to be more weaker signals present in addition to the very strong GW150914). Additionally, noise that resembles these chirps can be an important source of background in gravitational-wave searches.
For more information on the chirp-like structure of GW150914, see http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.116.061102
¶ Examples
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Audio of Chirp (with associated spectrogram) Make sure to wear good headphones!
