This alog is intended as record keeping for a quick investigation into an out of observing mode data request for GPS time 1422964623 (Feb 7, 2025), when the LHO interferometer had just relocked, but calibration had not settled.

Relevant monitoring lines and kappa value trend can be seen on the calibration  LHO grafana page.

I picked a period 15 minutes after the gps time as well settled (although Kappa_C was trending up with thermalization) to create an estimated calibration model closer to what I think should have been applied at the GPS time.  I then took the ratio of that model's response function over the response function of the actually applied calibration model which was using the clearly frozen time dependent correction factors right after reaching low noise.

The attached plot of that ratio shows the ratio has a maximum deviation in magnitude of about 12% and 8 degrees.  I don't think this is exactly right, due to the clear trend in the kappa_C on the grafana page, but its close enough that I'd certainly be comfortable with a flat +/- 20%/20 degrees uncertainty statement.