This is just a thought, but it may be possible to fit the power-reduction curve to the TRX or TRY DC signals at every lock loss during the recent observation run. Though I'm not sure how useful they would be.

Mmm, ring-down measurement at the lock-loss is complicated. We need to consider about:

• How fast the injection beam was shutted out?
• What is the main reason of the ring-down? IMC lock loss, kick of ETMs, PRM, BS or ...? It is difficult to say.
• Arm cavity is not independent from the other arm cavity and the PRC. So, the finesse of each cavity and the PRC affect to the ring-down signal
• And more

I don't know what kind of information we can extract from the ring-down of each lock loss. Do we have?