Summary of MD03.refstack.20121101

Similar to the MD03.GR0 (MD.GR0#MD03.GR0) refstacks for the 2011/2012 season, these include recent improvement and input cuts to help constrain the convolved stacks as well. Because the refstack is made with reprocessed pixels, the refstack pixels will now have the ubercalibration. Overall fewer inputs to the refstack were done this round and will not be excessively deep as last season.

MD03 observations:

  • starting end of October 2012
  • early November 2011 through March 2012 but a few z,y through mid-June 2012
  • Oct. 2010 to May 2011
Filter N total N FWHM<8 pixels N (FWHM<8 pixels for 2011/2012
g 484 405 81
r 472 424 89
i 602 547 148
z 837 781 298
y 386 367 152

Status:

  • 10/30/2012 exposure reprocessing started, including 2009 exposures to
  • 11/3 reftests run setup, evaluated.
  • 11/4 full refstack run setup
  • 11/7 release to datastore, run backlog of WS and SS diffims done.

MD03.V3 Processing (chip->warp + refstack)

Exposure reprocessing was done for only a limited number (~150) of the best images from 2009-2011 (not 2010-2011 like MD10,01,02 before since g,r, and somewhat i-band all seems to have not as good of seeing in 2011) to provide a balance of N input warps versus best seeing, excluding exposures with large background, low zeropoints and large elongation.

Processing chip-warp and the refstack itself has the same label, data_group

  • label: MD03.refstack.20121101 --> once set as active refstack for diffims, stack label will change to MD03.refstack, chip/cam/warp label will remain the same
  • data_group: MD03.refstack.20121101

New ipp-20121026 tag used but shouldn't be any large changes for refstack processing versus ipp-20120802.

Histograms of the FWHM major and minor and elongation from camera stage value (full exposure) for the sample of reprocessed exposures (red) and used for refstack.20121101 (top blue) and used for refstack.20111010 (bottom blue) in grizy order

Test stack (reftest) sample also made again for skycell.055 with different number of input warps.

  • label: MD03.reftest.20121101
  • data_group:
    • MD03.reftest.20121101.c#f<FWHM cut> where #=comparison run, <FWHM cut>=cut <fwhm_major from camProcessedExp x10>
    • MD03.reftest.20121101.all.<FWHM cut> where all means 2009+2010+2011 data possible, <FWHM cut>=cut <fwhm_major from camProcessedExp x10>
    • MD03.reftest.20121101.2010.<FWHM cut> where 2010 means 2010+2011 data only, <FWHM cut>=cut <fwhm_major from camProcessedExp x10>

Summary comparison table with the approximate FWHM (major) as the PSF FWHM from a center field skycell (V3=055) after running psphot on the stacks.

| data_group                    | filter  | stack_id | warps_in | warps_rej |  FWHM_MAJ   IQ_FW1 (pixels)
+-------------------------------+---------+----------+----------+-----------+
--> 2012/2013 refstack
| MD03.refstack.20121101        | y.00000 |  1734441 |       92 |        32 | 	 4.69  3.78
| MD03.refstack.20121101        | z.00000 |  1734507 |       87 |        16 | 	 4.63  3.64
| MD03.refstack.20121101        | i.00000 |  1734570 |       95 |        19 | 	 3.79  3.28
| MD03.refstack.20121101        | r.00000 |  1734637 |       83 |        17 | 	 3.78  3.21
| MD03.refstack.20121101        | g.00000 |  1734707 |       85 |        23 | 	 3.55  3.24

--> reftest comparisons		
| MD03.reftest.20121101.all.51  | g.00000 |  1729857 |       80 |        20 | 	 4.65  3.66
| MD03.reftest.20121101.2010.51 | g.00000 |  1729958 |       49 |        11 | 	 5.04  3.78
| MD03.reftest.20121101.c1f48   | g.00000 |  1731775 |       33 |         7 | 	 4.50  3.51
| MD03.reftest.20121101.c1f51   | g.00000 |  1731776 |       70 |        18 | 	 4.66  3.70
| MD03.reftest.20121101.c1f53   | g.00000 |  1731777 |       99 |        31 | 	 4.71  3.81
| MD03.reftest.20121101.c1f55   | g.00000 |  1731778 |      130 |        43 | 	 4.79  3.90
---	
| MD03.reftest.20121101.all.46  | r.00000 |  1729855 |       97 |        26 | 	 4.59  3.54
| MD03.reftest.20121101.2010.46 | r.00000 |  1729856 |       71 |        19 | 	 4.88  3.92
| MD03.reftest.20121101.c1f43   | r.00000 |  1731771 |       34 |         8 | 	 4.48  3.48
| MD03.reftest.20121101.c1f45   | r.00000 |  1731772 |       62 |        14 | 	 4.66  3.57
| MD03.reftest.20121101.c1f47   | r.00000 |  1731773 |      107 |        25 | 	 4.84  3.68
| MD03.reftest.20121101.c1f48   | r.00000 |  1731774 |      134 |        27 | 	 4.91  3.76
---
| MD03.reftest.20121101.all.42  | i.00000 |  1729853 |       78 |        17 | 	 3.68  3.18
| MD03.reftest.20121101.2010.42 | i.00000 |  1729854 |       70 |        17 | 	 3.67  3.17
| MD03.reftest.20121101.c1f40   | i.00000 |  1731767 |       39 |         9 | 	 3.57  3.07
| MD03.reftest.20121101.c1f42   | i.00000 |  1731768 |       61 |        14 | 	 3.66  3.15
| MD03.reftest.20121101.c1f44   | i.00000 |  1731769 |       95 |        19 | 	 3.78  3.28
| MD03.reftest.20121101.c1f47   | i.00000 |  1731770 |      124 |        34 | 	 3.79  3.33
---
| MD03.reftest.20121101.all.38  | z.00000 |  1729851 |       69 |        18 | 	 3.68  3.16
| MD03.reftest.20121101.2010.38 | z.00000 |  1729852 |       60 |        18 | 	 3.71  3.17
| MD03.reftest.20121101.c1f37   | z.00000 |  1731763 |       30 |         7 | 	 3.62  3.15
| MD03.reftest.20121101.c1f38   | z.00000 |  1731764 |       52 |        10 | 	 3.69  3.17
| MD03.reftest.20121101.c1f39   | z.00000 |  1731765 |       87 |        15 | 	 3.78  3.21
| MD03.reftest.20121101.c1f40   | z.00000 |  1731766 |      123 |        27 | 	 3.81  3.21
---
| MD03.reftest.20121101.all.41  | y.00000 |  1729749 |       88 |        21 | 	 3.45  3.11
| MD03.reftest.20121101.2010.39 | y.00000 |  1729750 |       87 |        21 | 	 3.46  3.10
| MD03.reftest.20121101.c1f36   | y.00000 |  1731759 |       29 |         4 | 	 3.37  2.93
| MD03.reftest.20121101.c1f41   | y.00000 |  1731760 |       60 |        14 | 	 3.47  3.11
| MD03.reftest.20121101.c1f48   | y.00000 |  1731761 |       97 |        33 | 	 3.56  3.27
| MD03.reftest.20121101.c1f49   | y.00000 |  1731762 |      106 |        37 | 	 3.58  3.32

--> previous 2011/2012 refstack		
| MD03.refstack.20111010        | g.00000 |   442420 |      114 |         5 | 	 4.90  3.97
| MD03.refstack.20111010        | r.00000 |   439278 |      123 |         4 | 	 4.92  3.83 	
| MD03.refstack.20111010        | i.00000 |   438012 |      116 |         7 | 	 4.13  3.61
| MD03.refstack.20111010        | z.00000 |   435261 |      125 |        18 | 	 3.94  3.25
| MD03.refstack.20111010        | y.00000 |   429837 |      108 |         7 | 	 4.04  3.83



As before, the FWHM_MAJOR with the central skycell can be variable and more so with largely different input sets. Comparison with the psf_major/minor maps are more useful between refstack versions.

Problems

  • generally edge skycells have issues, need better containment of those still. Possibly from adding 2009, even more here in MD03 (see Core coverage below).
  • some convolved stacks have strange/poor FWHM PSF -- reprocessed using DEEP_STACK config with lighter input restrictions so may not have best FWHM, but 99% on the edge of field so won't anyways. Seems to be fewer problems compared to previous refstacks.
    • g: ---
    • r: ---
    • i: 017, 082 -- basically oddly large FWHM, redo with DEEP_STACK didn't change so kept original.
    • z: 038 -- oddly large FWHM, redo with DEEP_STACK helped and --replaced-- original.
    • y: 021 -- oddly large FWHM, redo with DEEP_STACK didn't really help and kept original. 087 -- poor target PSF and redo with DEEP_STACK --replaced-- original.
  • bad cell arc in primarily skycell.033,024,025,026,047 y-band from ota14, cell 31. Not really seen in skycell.036 like others.
  • poor/bad cell arc in primarily skycell.064 g-band (and less so in other filters) from ota43, cell 54? see MD10.refstack.20120705 where was in skycell.054.
  • misc clusters of ghosts in g-band
  • skycal photometry basically fails but doesn't fault for skycell.077 (and possibly 078, 087) with ZPT_ERR~1.05 and is the cause of the shallow detection limit @0.2 mag map. (probably want a fault if ERR>X config option)

Core coverage is the default set

82-87
x1-x8
12-17
  • weaker (fewer inputs) for 012,017,021,028,071,078,082,087 in various filters
  • using 2009 data and even in other years has provided some additional edge skycells in the refstack to be aware or wary of. Likely won't be covered enough for many diffims.
    • g: 005, 030, 040, 050, 095
    • r: 004, 005, 058, 095
    • i: ---
    • z: 004, 005, 006, 030, 050, 093, 094
    • y: ---

Refstack Summary

Refstacks run through the staticsky (single filter mode so basic psphot with deteff measurements) and skycal stage on the unconvolved stacks to make the map plots (full 5 filter version still having occasional faults to work through):

  • label: MD03.refstack.20121101, MD03.refstack.20121101
  • data_group: MD03.refstack.20121101.1x20121104, MD03.refstack.20120927.1x20121104.cal20121104

Source photometry psf_major,_minor maps (grizy):

Magnitude of sources@5-sigma maps (grizy):

Detection efficiency magnitude @50% recovery (500 fakes, grizy):

Attachments