Link to full report: https://wiki.ligo.org/DetChar/DataQuality/DQShiftLHO20170417

Summary below (see full report for details):

• Percentage of time spent observing (95.5%+51.6%+63.4%)/3 = 70.2%
  • planned commissioning in addition to regular maintenance reduced this percentage
• Typical BNS range of around 65-70 Mpc, but degraded a bit by the end of the day on Wednesday (just under 60 Mpc)
• Relatively quiet 50 hz - 100 hz glitching is continuing (reported in previous DQ shift)
• A population of glitches around 25-50 hz appeared on Wednesday, witnessed by the ETMY OpLev? (similar glitches have been noticed before)
  • Also coincident with FEC overflows
  • OpLev damping is OFF.