[Comm2011] twilights at different rotator angles

[Gijs Verdoes Kleijn]

Hi John and Edwin,

As a quick check I have divided the raw twilights at different rotator 
angles by the one at rotangle=0: see top of this page:
http://wiki.astro-wise.org/projects:omegacam:commissioning:flatfields
~2-3% differences in twilightflats as a function of rotator angle are seen.

I think another analysis route is needed to say more than this about 
dependence on rotator angle. My first thought is to look again at 
twilightflats*gain

Best wishes, Gijs


-- 
--------------------------------------------------------------------
|dr Gijs Verdoes Kleijn         |   astronomer                     |
|e-mail: verdoes at astro.rug.nl   |   OmegaCEN / Kapteyn Institute / |
|www: www.astro.rug.nl/~verdoes |   Target                         |
|tel: +31-50-3638326            |   University of Groningen        |
|mobile: +31-654658050          |   postal address:                |
|                               |   Kapteyn Astronomical Institute |
|                               |   Postbus 800, 9700 AV, Groningen|
|                               |   The Netherlands                |
--------------------------------------------------------------------