At 2257utc, noticed L1 go to the YELLOW ("Calib not ready") state on gwistat.  Went to check LLO screenshots to confirm L1 looked down (it mostly looked down although some screenshots took a few minutes to update showing so).  Ran to let Robert know. 

At 2302, H1 was dropped out of Observing.  Robert did some measurment set-up in the Control Room, and then went out to the LVEA to turn on an amplifier which is set up in the H1 PSL area.  Robert has been approved to have 1hr of measurement time.