MDM Trouble Report for 2006 Mar 25

Telescope: 2.4m
Observer(s): Finke, Shields (Ohio University)
Instrument: CCDS

Problem(s) Encountered:
During the afternoon we encountered a problem with some of
the arcs and the flatfield lamp, which resulted in a broad
spectral feature (resembling an accretion disk profile?!).
Problem occurred with the 350 grating centered at 4250 and
was visible in the flat, Ar, and Xe, but not Hg.   The feature
appeared at columns 829-890 and showed some evolution in
morphology when grating was tilted, but no significant shift
in columns.  The feature went away when we shifted to a
center wavelength of 4600.

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Submitted on 2006 Mar 26 [6:17:52]