The main (but not only) duty of a SciMon is to document when and why the detector falls out of lock - being in lock means that the interference pattern that the detector uses to sense length changes is
For the first half of my shift the detector was behaving itself nicely, and I thought we might make it through the whole 8 hours staying in science mode. But this hope was dashed when a reasonably local earthquake in Nevada knocked us out of lock. The disturbance from this lasted a while, but we got back into science mode and the end of my shift saw us back behaving well. There was also an unexpected interruption in the control room near the end of the run when a tour group came through to observe the detector in operation.
At the end of the shift I handed over to the next SciMon on the 4pm-12am shift, but I'll be back tomorrow. (Posts probably won't get much more exciting than this)