There was a ~3 hours lock at 7:00 UTC on July 13th.

Surprisingly, I did not find any aLOG entry related to this lock.

My full report is linked at the end of the page.

In brief:

• Although there seem to be issues with calibration, the range was "high" and relatively stable.
• The glitch rate is very low, although doubts have been raised about the interpretation of this data (the new version of Omicron may be reporting lower glitch rates than it used to)
• Lock loss was probably due to an earthquake

Outstanding issues:

• Whatever its value, the glitch rate increased by a factor ~10 in the last 30 minutes of the lock for unknown reasons
• In the last 50 minutes, a broad peak appeared (and was "stable") around 20 Hz. origin is unknown. BRUCO seems to suggest it could be related to the beamsplitter suspension.
• The laudest glitches seem all to have similar shape and frequency content. I was unable (partly for lack of data) to correlate them with any other channel.

Full report:

https://wiki.ligo.org/DetChar/DataQuality/DQShiftLHO20150713

NOTE: for whomever was present at the DetChar call where i presented the report, I added a number of updates (you can find them by searching the page for "update") based on the feedback received during the call.