A few more details about the ISC activity:

• the unplanned ISC support to the shift started at 21:24 UTC, when I was called to restart the Lock Acquisition with no beam hitting the B7 photodiode;
• with the West Arm locked and since the NI seemed aligned enough (looking at the B1p camera), I started to move the NE marionetta in order to get some flashes on the B7 PD;
• after a little less than an hour, at 22:17 UTC, I noticed that someone else was moving the suspension at the same time; I called the Control Room and the Operator told me that he was restoring the last saved position (which is in principle correct) but that:
  • he was not told that I had been called before and I was working on the Lock Acquisition;
  • the work on SNEB was still ongoing and it made no sense to try to lock before such work completed (and rightfully so);
• after the work on SNEB finished, around 22:48 UTC, I was called again in order to resume the recovery;
• I could only get flashes on B7_DC up to 0.2 mW, so I had to 'hack' the lock of the arm in order to succeed;
• once the North Arm locked, though, the angular dithering control could increase the arm cavity power up to 0.46 mW (little more than 50% of the standard), meaning that SNEB was misaligned;
• since nobody was present anymore, I waited until the Operator was given instructions about how to change the bench position;
• after that, Lock Acquisition could proceed and eventually succeeded, after a couple of trials and a couple of tunings:
  • Marco tuned the SSFS demodulation phase;
  • I tuned the PRCL demodulation phase, which was off by quite a bit (Delta = -0.35 rad); this will hopefully help in the transition to Dark Fringe (PRCL had a very low UGF during the transition), but most probably there is something else which needs some adjustment.

Science Mode was eventually achieved at 00:38 UTC.