jeffrey.bartlett@LIGO.ORG - posted 08:06, Sunday 26 February 2017 - last comment - 12:30, Sunday 26 February 2017(34413)
Ops Owl Shift Summary
Ops Shift Log: 02/25/2017, Owl Shift 08:00 – 16:00 (00:00 - 08:00) Time - UTC (PT)
State of H1: Locked at NLN, with 62.7 Mpc of range.
Intent Bit: Observing
Support: N/A
Incoming Operator: Ed
Shift Summary: A2L DTT script shows yaw is elevated. Will run the A2L script if LLO drops out of lock. Ran the A2L script while LLO was recovering from a Lockloss.
PI Mode 23 rang up and one minute later lost lock. At the time of the lockloss the End-X seismic (3-10 and 10-30 Hz) spiked off the top of the chart. Relocked with no problems. Damped PI Mode 27.
After relocking, the remainder of the shift was uninterrupted Observing.
Activity Log: Time - UTC (PT)
08:00 (00:00) Take over from Cheryl
09:08 (01:08) Drop out of Observing to run A2L script
09:16 (01:16) Back in Observing
13:59 (05:59) PI Mode 23 ringing up
14:00 (06:00) Lockloss –
14:22 (06:22) Relocked at NLN
14:25 (06:25) Damped PI Mode 27
16:00 (08:00) Turn over to Ed
The lockloss at ~14:00 UTC was likely caused or related to this 3.5 M earthquake: http://earthquake.usgs.gov/earthquakes/eventpage/uw61252706#executive
This was an unusual event: short but strong high-frequency seismic waves. It should be an interesting case to analyze.