The first night of Campaign 67 begins with a reasonable night of observing
at the Bok Telescope on Kitt Peak.
Light, scattered cirrus in the sky at sunset
moved away from the mountain by the time observations started and photometry
could be obtained along with spectropolarimetry. However, by 2200 local
time, cirrus moved back over the mountain until around 0300 when the sky cleared
again. At times, the clouds briefly halted observations and no photometry
could be secured for several blazars.
Although the seeing started out at 1.2 arcsec, it was 2-3 arcsec for
most of the night. The seeing improved to around 1.5 arcsec during
the last three hours of the night.
Over 20 blazars were successfully measured for polarization.