Here are the highlights of my data quality shift report for the week of 3/25-3/31.

• Duty cycle of 49.7% for the week between ~140-160 Mpc
• Roughly hour long periods of very low frequency (<30 Hz) noise in the strain which could not be reliably seen in seismic BLRMS or PEM overviews (see figure 1) 
  • Associated with range drops
  • Seen only on Tuesday
  • LASSO should be rerun on this day to try to identify correlations
• The SNR distribution of glitches was unexpected on Friday and Saturday - there is an overabundance of SNR ~10 Omicron triggers (see figure 2)
  • Hveto was not successful in vetoing this population
• There is a population of moderate (order 10) SNR glitches at 1100 Hz that appeared in the second half of the week (see figure 3)
  • The central frequency is apparently constant over time, so I suspect there is a common mechanism for this glitch
  • They start at roughly midnight UTC on Friday (3/29)
  • No clear morphology in Qscans
• There were several days where the number of spectral artifacts was over the alert threshold. It's unclear to me whether that is due to a lack of observing data or poor data quality

The full report can be found here: https://wiki.ligo.org/DetChar/DataQuality/DQShiftLHO20240325