http://adsabs.harvard.edu/abs/2010MNRAS.402.2403M

The Australia Telescope 20GHz Survey (AT20G), Version XX October 2009
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The Australia Telescope 20GHz Survey (AT20G), Version XX October 2009.
     Murphy T., Sadler E. M., Ekers R. D., Massardi M., Hancock P. J.,
     Mahony, E., Ricci R., Burke-Spolaor S., Calabretta M., Chhetri R.,
     De Zotti G., Edwards P. G., Ekers J. A., Jackson C. A., Kesteven M. J.,
     Lindley E., Newton-McGee K., Phillips C., Roberts P., Sault R. J.,
     Staveley-Smith L., Subrahmanyan R., Walker M. A., Wilson W. E.
Monthly Notices of the Royal Astronomical Society, Volume 402, Issue 4, pp. 2403-2423.
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ADC_Keywords: Radio sources ; Surveys ; Radio continuum 
Keywords: radio continuum: general -- catalogues -- surveys -- galaxies: active 
          -- cosmic microwave background -- methods: data analysis

Description:
 The Australia Telescope 20GHz Survey (AT20G) is a blind radio survey carried
 out at 20~GHz with the Australia Telescope Compact Array (ATCA) from 2004 to
 2008, and covers the whole sky south of declination 0\degr. The AT20G source
 catalogue presented here is an order of magnitude larger than any previous
 catalogue of high-frequency radio sources, and includes 5890 sources above a
 20~GHz flux-density limit of 40\,mJy.  All AT20G sources have total
 intensity and polarisation measured at 20~GHz, and most sources south of
 declination $-15\degr$ also have near-simultaneous flux-density measurements
 at 5 and 8~GHz. A total of 1559 sources were detected in polarised total
 intensity at one or more of the three frequencies.


File Summary:
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 FileName   Lrecl   Records    Explanations
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ReadMe         80         .   This file
at20gcat.dat   140     5890   The AT20G Catalogue, Version 1.0 (2009-10-15)
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See also:
    J/MNRAS/384/775/AT20G : Australia Telescope 20GHz (AT20G) Survey: Bright 
                            Source Sample (Massardi+ 2008)

Byte-by-byte Description of file: at20gcat.dat
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   Bytes Format Units   Label     Explanations
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   1- 19  A19   ---     Name      IAU designation
  21- 22  I2    h       RAh       Right Ascension J2000 (hours) (1)
  24- 25  I2    min     RAm       Right Ascension J2000 (minutes)
  27- 31  F5.2  s       RAs       Right Ascension J2000 (seconds)
      33  A1    ---     DE-       Declination J2000 (sign) (2)
  34- 35  I2    deg     DEd       Declination J2000 (degrees)
  37- 38  I2    arcmin  DEm       Declination J2000 (minutes)
  40- 43  F4.1  arcsec  DEs       Declination J2000 (seconds)
  45- 49  I5    mJy/bm  S20	  Peak brightness at 20 GHz (in mJy/beam) (3)
  51- 53  I3    mJy/bm  e_S20	  Uncertainty on S20
  55- 59  I5    mJy/bm  S8	  Peak brightness at 8 GHz (in mJy/beam) (3)
  61- 63  I3    mJy/bm  e_S8	  Uncertainty on S8
  65- 69  I5    mJy/bm  S5	  Peak brightness at 5 GHz (in mJy/beam) (3)
  71- 73  I3    mJy/bm  e_S5	  Uncertainty on S5
  75- 77  A3    ---     Epoch     Epoch of observation at 20,8,5 GHz (4)
      79  A1    ---     Quality   Quality flag (g=good or p=poor)
  81- 83  A3    ---     Flags     Other flags (5)
  85- 89  I5  	mJy/bm	P20	  Polarized flux density (or limit) at 20 GHz
  91- 92  I2	mJy/bm  e_P20	  Uncertainty on P20
  94- 98  F5.1	---     m20	  Fractional polarisation at 20 GHz
 100-102  I3	deg	PA20	  Position angle at 20 GHz
 104-108  I5  	mJy/bm	P8	  Polarized flux density (or limit) at 8 GHz
 110-111  I2	mJy/bm  e_P8	  Uncertainty on P8
 113-117  F5.1	---     m8	  Fractional polarisation at 8 GHz
 119-121  I3	deg	PA8	  Position angle at 8 GHz
 123-127  I5  	mJy/bm	P5	  Polarized flux density (or limit) at 5 GHz
 129-130  I2	mJy/bm  e_P5	  Uncertainty on P5
 132-136  F5.1	---     m5	  Fractional polarisation at 5 GHz
 138-140  I3	deg	PA5	  Position angle at 5 GHz

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Note (1): The mean uncertainty in RA is 0.9 arcsec. See Sec 4.1 of the paper.

Note (2): The mean uncertainty in Dec is 1.0 arcsec. See Sec 4.1 of the paper.

Note (3): See Sec 3.3.2 for calculation of fluxes for extended sources.

Note (4): The 3 digits give the epoch code for the 3 frequencies. 
          See Table 3 of the paper for an explanation of the epoch codes.

Note (5): Possible values for flags: e=extended source, h=Galactic HII region,
     	  p=Galactic planetary nebula, m=Magellanic clouds source, 
	  l=no match in low frequency surveys, b=large and extended.
	  See the paper for more details of these classifications.