ENR CTIO Blanco 4-m 2014-06-16

Calibration error during the day Jun 16th 2014:
Calibrations were started around 3:30pm and by 5:49pm they were not done. There was no obvious error and observations continued, but digitizing the images took a long time. The Alaarm History page shows numerous Timeout warnings and one Alert related with the comfort Display. This is the same problem we saw during the run (about 23:00 local). At this point Javier Rojas + Kathy Vivas decided to inetrrupt the script and restart SISPI, which solved the problem. 
Result: no z and Y dome flats for the (16/17) night.

White light left activated on exterior of dome:
At about 21:30 local time, we noticed strong scattered light in u-band images (e.g. image 324087 chip N24). This structure was only apparent in u, not obvious in any other filter.It is not fixed on the detector but moves with the sky.  I suspect the culprit is uv-bright * kap Sco (u 1.32, v 2.4...) which was a short distance outside the field of view at the time. On inspecting the telescope for stray light, the telescope operator found a light left on. This has been turned off.  

Guiding difficulties;
No worse than (14/15) and (15/16). Upon advice of Kathy Vivas, we attempted set guideexptime 200 but stil experienced occasional guiding failures. Note that the (16/17) run (this night) pointed at denser starfields than the previous two nights.