Shifter: Beverly Berger
LHO Fellows: Pep Covas Vidal, Karl Toland
- Duty cycle 72.6% on Monday, 17.6% on Tuesday, 84.7% on Wednesday for a total average over the shift of 58.3%. The BNS range was typically 68 Mpc.
- LHO remained locked and in observing during an earthquake at about 19:00 UTC on Wednesday, 28 June, but the noise and glitch rate were significantly elevated during this period.
- Unusual acoustic features appear at EY on 26 and 28 June (as well as other days) including broadband sharp noise, especially around 1:30 UTC, narrowband extended noise at around 23 Hz, and nearly periodic noise bursts at around 9 Hz.
- The BSC3 accelerometer spectrogram seems anomalous and has done so since 16 May 2017.
- Strong noise bands appeared below 15 Hz in the bounce/roll mode region in the first lock after the 28 June 19:00 UTC earthquake and persisted until the first lock loss on 29 June. The timing matches from turning on the dither lines (see alog 37205).
- The 12:00 UTC range drop due to truck traffic has disappeared from h(t) even though the traffic's effect on seismic is clearly visible. This follows the modification of the Swiss cheese baffle. See for example alog 36979.
- Lock losses that began at 00:17 UTC on 26 June (see alogs 37119, 37122, 37126) were apparently traced to ISS DC coupling (see alog 37168 and comments) and were eliminated by resetting some loop parameters and lines in Guardian.
For complete results see https://wiki.ligo.org/DetChar/DataQuality/DQShiftLHO20170626