Operators name: Yasui, Nakagaki
Shift time: 16-24 (JST)

Summary:

Check Items:
VAC,CRY,TEMP There was no problem.

16:00 OBSERVING from previous shift time
18:08 LOCK LOSS* (17:39 M5.5 Earthquake in Indonesia)
18:43 OBSERVING (automatically recovered)
20:10 LOCK LOSS (20:10 M3.9 Earthquake in Nagano, Japan)
20:41 OBSERVING (automatically recovered)
24:00 OBSERVING

* I ran the "PR3_alignment_check.py" script at 18:08 lock loss and was instructed to perform a PR3 alignment. (Probably unnecessary).
  I asked Ushiba-san to investigate.