Here is a list of the _known_ corrections to the systematic error that need to be accounted for when regenerating the O4a uncertainty budgets.



Issue
Start
End
Status

3.2 kHz ESD Driver Pole in CAL-CS Model (LHO:72043)
2023/04/26 (ER15)
2023/08/08 00:15 UTC
Rough fit exists. LHO:71787

 
Spoiled TDCFs due to noise in Kappa_UIM (LHO:71790, LHO:71846)
 
2023/07/20
 
2023/08/03
 
In progress. Pending correction file.
 

 
Thermalization effects seen in sensing function at 75W
 
ER15
 
2023/06/21
 
In progress by Cal group.
 
 
Thermalization effects seen in sensing function at 60W
 
2023/06/21
 
Now
 
In progress by Cal group.
 


There may be other corrections that are needed by additional unmodeled effects including OM2 hot/cold, drifting Kappa_T, and Pcal error that hasn't been accounted for (if any).

Useful reference: Record of Real-time Calibration Pipeline Parameter Changes: O4 (and ER15) -- H1 (DCC T2300297)