MDM Trouble Report for 2005 Feb 14

Telescope: 2.4m
Observer(s): Deokkeun An (OSU)
Instrument: Echelle

Problem(s) Encountered:
Every object image shows a big blob on its center
independent of filter selection. No such pattern
on dark/bias images were found.

You can see such a blob on
/data/pinatubo/visitor/deokkeun/n07/x_018.fits.

Probably it is not a problem of CCD itself; a bright
star shows quite dispersed stellar profile when it
is just located on the blob.

RETROCAM does not show such a blob on its images.
Some RETROCAM images can be found at
/data/pinatubo/visitor/deokkeun/.

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Submitted on 2005 Feb 14 [7:07:59]