MDM Trouble Report for 2019 Nov 06

Telescope: 2.4m
Observer(s): Podjed (Dartmouth College)
Instrument: OSMOS/B

Problem(s) Encountered:
While taking spectroscopic and photometric flats, there
appeared a dark blob right of center in each image. Tried to 
change roi to see if it stayed. After chatting with Justin &
Eric, probably something on the collimator lens or detector
window. Not sure when/how it would have happened, the dark
hatch and mirrors were closed while the dome was opening.
Per Eric's advice, I took an image at a higher airmass to see
if it stayed in the same region or if it would be out of the
way but it was persistent in staying there; also took an 
image with the slit position indicated in the guide star 
selector as a test, but the artifact/blob remained. Eric said
he will have to take a look at the instrument in the morning.
[Clouds were an issue so this did not result in a huge loss
of hours in and of itself in the end.]

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Submitted on 2019 Nov 7 [5:50:50]