MDM Trouble Report for 2003 Sep 27

Telescope: 1.3m
Observer(s): Bentz (OSU)
Instrument: Templeton

Problem(s) Encountered:
When I attempted to take biases earlier in the afternoon, I was
given an error message:

ccd_aread: wrong aio finished; expected 0.  This is bad.
***Error encountered in asynchronous read: data suspect
Failed, return code=0, elapsed=0.912000

The telescope seemed to work fine after this message, at least 
until later tonight.

Now the shutter on the telescope appears to be stuck.  Halfway 
through a set of five exposures on a standard star field 
(~12:00am), I noticed that the images suddenly looked funny.  
The stars appeared to be bleeding in one direction (up the 
screen) and the detector was shaded on the left side.  It 
looked almost like it does if you forget to move the guider out 
of the center of the beam.  Image sep27.104.fits was the first 
to show the problem.  Arlin Crotts helped me to figure out it 
was the shutter, and the bleeding stars were because the 
detector was still exposing while reading out. I took several
additional images (objects and biases) hoping it would fix 
itself, but no such luck.  We tried the command  shutter close  
and the computer said the shutter was closed, but the images
still looked the same.  We also tried the command  dl  to 
download the DSP again, and looked at the telescope to see if 
a wire had come loose around the shutter.  We couldn't find a 
way to fix the problem.  I have been taking images all night 
with biases immediately afterward to try and subtract out the 
smearing of the stars during the readout of the chip, but I'm
not sure this will result in useful data.

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Submitted on 2003 Sep 28 [4:59:00]