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SV 11 2 » History » Version 7

Angelo Fausti neto, 11/03/2012 10:38 AM

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h1. SV Notes for MJD 56234 (starting evening of November 2)
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h2. Observers
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| *Observer 1* | *Observer 2* | *Run Manager* | *SISPI Expert on Call*| *Eyeball Squad*|
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| Soares Santos | Depoy | Soares Santos | Honscheid | Romer |
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h2. DECam Configuration and Setup
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|SISPI Configuration File|  *sv.ini*|
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|DECam constants |*DECAM:CURRENT*|
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|Proposal ID| *2012B-0003*|
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|Image Processing (Calibration)| *NCSA*|
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|Image Processing (First Cut)|*NCSA*|
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h2. Almanac
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Twilight ends 21:34, middle of night to hand over to community SV at 01:26
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Moonrise at 23:24, 84% illuminated, 54 degrees away from our Mini-Survey field on Stripe 82.
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h2. Weather Conditions 
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* [[Tololo Weather Links]]
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h2. Observing Plan and Goals for the Night
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# [[Calibration_Observations|Standard bias and dome flat]] sequence during afternoon
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# [[Calibration Observations|Dark frames]] if no bright lights needed in dome.  _Try to get darks today, more important than getting all domes again_
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# Please try to get dome open for temperature equilibration at earliest appropriate time, be sure all cooling/ventilation systems are on.
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# [[Calibration Observations|i-band twilight flats]] - _Quit twilights as soon as sky is dark enough for stds_
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Operate through night with the baseline Focus&Alignment configuration (Telescope and filter LUTs in use, z Trim on, accumulate).  Take note of how large the first focus correction is after slewing to new field: this will determine whether it will be habitually necessary to take a short (~30s) exposure after each slew to allow donuts/AOS to determine new focus position.  
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Monitor Conditions:
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# Check on DIMM status, running if at all possible.
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# Make sure RASICAM is online if weather conditions permit.
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# A few times per night ask the operator to contact the other telescopes on Tololo to get their seeing value. Record those in the eLog.
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If *good* conditions - sky is clear and seeing is <=1.1":
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# [[Calibration_Observations|Photometric standards]] sequence as soon as dark enough (grizY in 3 fields at different airmasses,  preferably one at X < 1.25, one at X = 1.25-1.65 and one at X > 1.65).  Follow link for the suggested fields and scripts.  Douglas suggests standards can begin 30 min before astronomical twilight.  
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# [[SN_Observing|SN template observations]] in gr for ~2 hrs until moon elevates sky brightness.  Given the guiding errors invalidate nearly all of yesterday's SN template observations, we should just start the sequence afresh.
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# *If the 200s exposures are still trailed* abandon the SN templates, use time for debugging as needed, and spend sky time taking the [[Star_Flat_Observations]] with 50s exposure times to ameliorate trailing.
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# [[SN_Observing|SN template observations]] in iz for remainder of half-night (will not have time to complete all of them)
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# 1:10 AM repeat another [[Calibration_Observations|photometric standards]] sequence of grizY in 3 fields
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# Request of Dara to repeat grizY standards in 2 or 3 fields at AM twilight.
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If *moderate* conditions - thin clouds, and/or poorer seeing <=1.4"
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# [[Calibration_Observations|Photometric standards]] in evening twilight
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# [[Star_Flat_Observations|StarFlat sequences]] of 20 wide dithers in each grizY (g and r first, with Moon down).  Move to lowest accessible Galactic latitude (b>=10 degrees) to increase stellar density w/o crowding.  Should take ~20 x (80+30)s = 37 min per filter, ~3 hrs total.
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# If time permits: [[Polar_Axis|Polar Axis]] determination exposures.
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# [[Calibration_Observations|Photometric standards]] at 1:10 AM
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If *poor* conditions - thicker clouds and/or seeing >1.4"
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# [[Calibration_Observations|Photometric standards]] at evening and 1:10 AM  if thin clouds or clear
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# Take [[Star_Flat_Observations|StarFlat sequence]] in i band if thin clouds or clear
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# [[Polar_Axis|Polar Axis]] determination
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# DECal sweeps that were not completed during commissioning
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Regardless of cloud conditions, If QR indicates FWHM of PSF is stable at <= 1.1" at any period:
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# Take 2 focus frames in i band, 25 um steps +- 100 um from donut-recommended best focus position.  [This is to determine best focus for science array relative to best focus for F/A CCDs.]
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h2. Notes from the 4PM Meeting and Additional Comments
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Eyeball squad and SN squad both report that nearly all long exposures are seriously trailed.  Trails are diagonal, not aligned to E-W.  So top priority for tonight is to insure that guider is on and working properly.  The QR report of FWHM's clearly showed worse FWHM on all the long exposures.
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Extensive debate ensued about the nature of the problem.  GUIDER=3 is set in headers of all the trailed images.
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Edited the plan above to reflect that SN templates should not be taken if the guiding issue persists.
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h2. Notes from Observers
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Here is "Night Summary":http://decam03.fnal.gov:8080/nightsum/nightsum-56234/nightsum.html
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*Quick Reduce*
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!2012-11-03.png!
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!2012-11-03-bkg.png!
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h2. Notes on Analyses of Night's Data:
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* Bunch of E1 exposures, some have good enough guiding to be templates.
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* Useful standards and twilights both AM and PM.
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* *145907-145952* are star flat sequences in i, z, and part of Y.
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* *145999-146010, 146019-035* are 30s r exposures from community time marching around sky in 0.7-degree steps, could be useful for star flats etc.
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* *146075-089* another such sequence.