Night report 2015-09-05

Observers: Tania Moraga, Cristina Romero-Cañizales, Lluís Galbany

TAT: Joe Anderson, Morgan Fraser

Data reducers: Thomas De Jaeger, Francisco Förster

******* LOG *******

21:20 UT EFOSC bias

21:29 UT EFOSC arcs

Conditions at the beginning of the night:

Cirrus clouds / DIMM seeing: 0.78" / Humidity ~ 30% / Wind speed < 10 m/s

Moon: 41%

22:40 UT EFOSC skyflat UBVRi

- Wind btw 12 and 15 m/s from North: we cannot observe sources with DEC~>-30

23:23 UT ASASSN-15lh Gr#11 and Gr#16 / seeing=0.98 & wind=9.6 m/s

at ~00:10 conditions have gotten worse: seeing~1.8 & wind~12.6 m/s

(although now sky is clearer). The seeing varies rapidly between

1.3 to 1.8 (approx). Before Gr#16 starts, we change the slit to 1.5"

01:40 UT While the OB for ASASSN-15lh is finishing, the wind has

considerably increased (>20 m/s, average ~17 m/s) --> dome closes!