- IFO was observing with an average duty cycle of (71 + 73.3 + 67.2 + 93.8 + 93.6 + 88.2 + 91.9)/7 = 82.7% for the week.
- The BNS range hovered around 118Mpc on Monday and Tuesday, rest of the days it was around 115Mpc.
- Increased low frequency glitches (10-30Hz ) due to high microseism, especially Thursday onwards.
- Earthquakes and high microseism knocked the IFO out of lock a number of times throughout the week. Earthquakes alog 54061 alog 54014 alog 54111 alog 54157 microseism alog 54142
- On Saturday and Sunday, there was a lockloss due to unknown causes. alog 54160 alog 54167.
- Corner Station air compressor duty cycle reduced significantly to reduce the noise that it was creating. alog 54071.
- Issues with seismon on Friday, it was not updating. alog 54149
- Wandering Pcal X line in the high frequency region.

Link to the entire DQ Shift wiki page :https://wiki.ligo.org/DetChar/DataQuality/DQShiftLHO20191223