Observers:  Sun Mi Chung, Michael Fausnaugh, Loreto Barcos-Munoz
SA:  Dave T.
TO:  Steve A.

Summary:

Clear skies for most of the night.  However, we had to close the telescope at 07:00 UT due to high winds 
and re-opened at 10:30 UT.  Observed OSU_M31 from nautical twilight to 07:00 UT (when telescope closed).  
Once telescope re-opened at 10:30 UT, we observed another 20 minute block of OSU_M31.  With the remaining 
20 minutes before twilight, we tried to observe Uva_WISE/WISE_0612-06 but could not point in that direction 
due to high winds, so observed OSU_monitor/N2403 instead.


See below in the log for details regarding issues using the M31 science field to collimate.  


00:20 -- Take LBC biases
00:56 -- Take test skyflat 
01:05 -- Skyflats in V and R filters

01:11 -- Preset to M31 focus field
01:15 -- Start collimation with dofpia.  Sky is too bright, dofpia failed -- "Attempt to subscript sky with 
         NEWMAX is out of range.  Execution failed at fit_backgnd" 
01:19 -- Start dofpia again.  
01:26 -- Collimation completed!  Start co-pointing correction.  

**** 01:27 -- Nautical twilight ****** 

01:31 -- Preset to M31 science OB and begin exposures 
01:37 -- Seeing is ~1.1 arcsec      
01:53 -- Focus on the blue side deteriorating...  Seeing is  ~1 arcsec in red and skies are clear.
02:08 -- Start dofpia on the science field (i.e. without moving off target as requested by PI).  Finished at 02:13.
02:14 -- Start M31 science OB 
02:19 -- Seeing is ~0.9 arcsec.   Sky is clear.  
02:50 -- Focus 
02:54 -- Start science OB 
03:22 -- Seeing ~1.1"
03:31 -- Starting M31 short OB (focus looks stable)
03:42 -- Focus still looks stable, starting another M31 short 
03:54 -- Focus still stable, starting another M31 short 
03:57 -- Seeing ~1.
04:05 -- Focus 
04:09 -- Starting M31 science OB
04:49 -- Focus 
04:51 -- dofpia crashed...  "Attempt to subscript sky with NEWMAX is out of range.  Execution failed at fit_backgnd" 
04:53 -- dofpia,/backout 
04:54 -- Try dofpia again...  failed again.  Call the support astronomer.
04:58 -- Try dofpia in the focus field instead of the M31 field.  dofpia is now working.  

      From now on should NOT collimate with M31 in the center of the field, even if dofpia works the first few times.   
      It was likely just on the verge of being able to correctly fit the background each of the previous times, 
      but eventually failed, possibly because the seeing degraded a little bit and therefore it was more difficult to fit the background. 

      dofpia makes 2 assumptions -- that there are a number of true point sources and that the background is fairly 
      uniform.  Trying to fit a background with such a large gradient causes dofpia to fail.  Need to collimate 
      on a different field with a more uniform background.

05:06 -- dofpia on focus field is complete.
05:07 -- Start co-pointing correction 
05:12 -- Start M31 science OB. 
05:17 -- Seeing is ~0.9 arcsec.
05:49 -- collimate on the focus field. 
05:53 -- dofpia finished.  Start science OB. 
05:58 -- ~0.8 arcsec seeing in blue
06:51 -- Seeing is 1.2 arcsec 
07:01 -- Abort OB and close telescope due to high wind.

10:34 -- Opening up telescope.  
10:55 -- Send preset to M31 focus field 
10:57 -- Start collimation with dofpia
11:01 -- Start co-pointing 
11:05 -- Start M31 science OB.  Sky clear 
11:15 -- Seeing is ~1.7 arcsec.
11:34 -- Seeing is ~2 


11:40 -- Preset to UVa_WISE/WISE_0612-06.  Cancel this preset because it is in the southwest where winds are too high and above the telescope limit.

11:44 -- Preset to OSU_monitor/N2403.  Even though this program requires dark time and the source is close to the moon (55 deg), 
         there are no other sources we can go to at this time. 
11:48 -- Collimate  
11:52 -- Start OSU_monitor/N2403 science OB 
11:57 -- Seeing is ~1.2 arcsec 

12:22 -- Preset to twilight field, test exposure times. 
      	 Take twilights flats