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Virgo Runs (O3)
magazzu - 6:58 Sunday 12 May 2019 (45869) Print this report
Operator Report - Night Shift 11 May 2019

ITF found in Science Mode. It unlocked at 22:39 UTC, possibly due to the bad weather. After a single unlock at LOW_NOISE_1, the ITF was back in Science Mode at 23:21 UTC.
At 0:22 UTC, for around 30 seconds, the Horizon abruptly dropped at 0. From the DMS it was possible to see some flags related to SNEB ( SBE and LC ) became red during this period ( see attached plot ).
ITF unlocked again at 1:55 UTC, unfortunately it started unlocking systematically at LOW_NOISE_3. I contacted the ISC onCall ( M. Mantovani ) that suggested to temporary disable the BS AA. After performing this action it was possible to reach again LOW_NOISE_3_SQZ. Science Mode from 3:39 UTC.

Downtime event - ISC
Switched to Troubleshooting Mode from 3:17 UTC to 3:39 UTC due to systematic unlocks reaching LOW_NOISE_3. Under request of the ISC OnCall I disabled the BS AA.
Action performed:
on ITF_LOCK.py on line 3784 and 3785:
BS.AATX_FLAG = 2.0 -> value changed to 1.0;
BS.AATY_FLAG = 2.0 -> value changed to 1.0;

ENV
Strong Sea activity during the shift. Also strong rain from around 22:25 UTC to 23:40 UTC.

Guard Tour

21:45 UTC - 22:19 UTC
0:16 UTC - 0:49 UTC
2:29 UTC - 3:03 UTC
4:10 UTC - 4:42 UTC

Images attached to this report
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