TITLE: 08/31 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 158Mpc
INCOMING OPERATOR: Ryan C
SHIFT SUMMARY: Currently Observing at 158 Mpc and have been Locked for 5 hours. Lockloss was fast and easy to recover from - the IFO just needed my help grabbing ALSY for the same reason we've been seeing for a while: SCAN_ALIGNMENT had taken it to a good-looking spot (above 1), but it wasn't high enough to catch. A few taps was all that was needed.
We had another test of using the ASC Hi Gains button again! During the earthquake, peakmon started creeping up above 500, and picket fence was showing multiple stations were yellow or orange. I tried to hold off on leaving Observing as long as possible since the ground motion wasn't that bad yet, but I eventually started the transition to ASC Hi Gain when I saw peakmon hit 900, but it quickly went above 900 and by the time we started transitioning over, we were above 1200 and quickly increasing. Luckily, we didn't lose lock, but we were close, so I definitely should've transitioned over sooner! This earthquake went up to 2200 on peakmon. Afterwards, the transition back went smoothly.
LOG:

14:30 UTC Observing and Locked for almost 3 hours
17:17 Lockloss
    - Had to adjust ALSY a bit for it to be able to catch
18:30 NOMINAL_LOW_NOISE
    18:33 Observing
    20:06 Earthquake mode activated
    20:17 I took us out of Observing and selected ASC Hi Gain to try and ride out the earthquake
    20:34 Back to regular NLN gains and back into Observing
 

TITLE: 08/31 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 158Mpc
OUTGOING OPERATOR: Oli
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 13mph Gusts, 7mph 3min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.08 μm/s
QUICK SUMMARY:

• We've been locked for 4.5 hours
• Secondary microseism is decreasing, wind is low

Lockloss at 2025-08-31 17:17 UTC after 5.5 hours locked

Sun Aug 31 10:07:39 2025 INFO: Fill completed in 7min 35secs

TITLE: 08/31 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 157Mpc
OUTGOING OPERATOR: Tony
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 4mph Gusts, 2mph 3min avg
    Primary useism: 0.01 μm/s
    Secondary useism: 0.11 μm/s
QUICK SUMMARY:

Currently Observing at 156 Mpc and have been Locked for almost 3 hours.

TITLE: 08/30 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 158Mpc
INCOMING OPERATOR: Tony
SHIFT SUMMARY:

H1 has been locked entire shift and NO drops from Observing (H1 locked for 7.75hrs).  Did not get to run Simulines due to L1 also being UP the whole time.
LOG:  n/a

TITLE: 08/30 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 158Mpc
INCOMING OPERATOR: Corey
SHIFT SUMMARY: Observing at 158 Mpc and have been Locked for 2.5 hours. Relocking after the earthquake knocked us out was pretty easy - I just had to run an initial alignment after we lost lock in START_TR_CARM from a bad alignment.
LOG:

14:30 UTC Observing and Locked for over 13.5 hours
16:23-16:27 Small plane flying overhead Tagging DetChar
18:31 Out of Observing for Calibration suite
19:01 Lockloss during calibration sweep due to sudden local earthquake
    - Initial alignment run
21:10 NOMINAL_LOW_NOISE
    21:13 Observing

TITLE: 08/30 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 158Mpc
OUTGOING OPERATOR: Oli
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 11mph Gusts, 5mph 3min avg
    Primary useism: 0.01 μm/s
    Secondary useism: 0.13 μm/s
QUICK SUMMARY:

Handoff from Oli was straightforward.  I'll monitor L1 for downtime, in case H1 can have an opportunity for a Simulines Calibration opportunity (simulines failed earlier due to the Nevada EQ).  H1's currently been locked for 2.5hrs (almost thermalized). 

At the time of this measurement, we had been Locked for over 17.5 hours and so we were well thermalized. Close to the very end of simulines (4 excitations still running), we had a lockloss due to a local earthquake, so we only have the broadband measurements.

Calibration monitor screen

Broadband
2025-08-30 18:32:35 - 18:37:53 UTC
/ligo/groups/cal/H1/measurements/PCALY2DARM_BB/PCALY2DARM_BB_20250830T183242Z.xml

Lockloss at 2025-08-30 19:01 UTC due to sudden local earthquake (picket fence, ndscope) right near the end of running simulines. We had been Locked for just over 18 hours.

Sat Aug 30 10:08:29 2025 INFO: Fill completed in 8min 25secs

TITLE: 08/30 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 156Mpc
OUTGOING OPERATOR: Tony
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 1mph Gusts, 0mph 3min avg
    Primary useism: 0.01 μm/s
    Secondary useism: 0.13 μm/s
QUICK SUMMARY:

Observing at 156 Mpc and have been Locked for over 13.5 hours.

TITLE: 08/30 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 157Mpc
INCOMING OPERATOR: Tony
SHIFT SUMMARY: One lockloss with an easy recovery, we've been locked for 4 hours.
LOG: No log.

• 23:31 UTC lockloss

  • 01:01 UTC Observing

  • 03:27 UTC Superevent S250830m

I processed the OPLEV charge measurments that Rahul took on the 26th.

The charge on ETMY looks stable and low. The charge on ETMX appears high, the error bars are quite large but even with those each quadrant has increased since the last measurement.

23:31 UTC lockloss

(Jordan V., Tony S., Gerardo M.)