Access to Astronomical Catalogues

VIII/41        The UTR-2 Very Low-Frequency Sky Survey Data  (Braude+ 1978-1982)
The UTR-2 Very Low-Frequency Sky Survey Data
Decametric survey of discrete sources in the northern sky.
II. Source catalogue in the range of declinations +10 to +20
     Braude S.Ya., Megn A.V., Rashokovski S.L., Ryabov B.P., Sharykin N.K.,
     Sokolov K.P., Tkatchenko A.P., Zhouk I.N.
    <Astrophys. Space Sci., 54, 37 (1978)>
    =1978Ap&SS..54...37B
Decametric survey of discrete sources in the northern sky.
V. Source catalogue in the range of declinations 0 to +10.
     Braude S.Ya., Megn A.V., Sokolov K.P., Tkatchenko A.P., Sharykin N.K.
    <Astrophys. Space Sci., 64, 73 (1979)>
    =1979Ap&SS..64...73B
Decametric survey of discrete sources.
VII. Source catalogue in the range of declination -2 to -13.
     Braude S.Ya., Miroshnitchenko A.P., Sokolov K.P., Sharykin N.K.
    <Astrophys. Space Sci., 74, 409 (1981)>
    =1981Ap&SS..74..409B
Decametric survey of discrete sources in the northern sky.
IX. Source catalogue in the declination range 52 to 60.
     Braude S.Ya., Sharykin N.K., Sokolov K.P., Zakcharenko S.M.
    <Astrophys. Space Sci., 111, 1 (1985)>
    =1985Ap&SS.111....1B
Decametric survey of discrete sources in the northern sky.
XI. The results of the UTR-2 very low-frequency sky survey in the declination
range 41 deg. to 52
     Braude S.Ya., Sokolov K.P., Zakcharenko S.M.
    <Astrophys. Space Sci., 213, 1 (1994)>
    =1994Ap&SS.213....1B
ADC_Keywords: Radio sources


Description:

    The results of the very-low frequency (16.7MHz) survey of discrete
    sources made with the UTR-2 radio telescope is presented. The survey
    concerns the declination zones -13° to -2°, 0° to 20°,
    and 41° to 60°. The UTR-2 radio source catalogue contains an
    estimate of the coordinates and flux densities of 1819 sources
    measured at a number of the lowest frequencies used in contemporary
    radio astronomy within the range from 10 to 25 MHz.

    The catalogue is made of two parts:

    mean.dat: the averaged values of the coordinates and the corresponding
    errors, the source flux-density at the middle UTR-2 frequency 16.7 MHz
    as obtained from measured spectrum of the source at all UTR-2
    frequencies and its error, the value of measured low-frequency
    spectral index with respect to which the estimate of has been
    obtained, the parameter W characterizing the integral reliability of
    the obtained source estimates and the corresponding object name from
    higher-frequency radio survey provided the source has been identified.
    To indicate the integral readability of the source parameters obtained
    we used the symbols A, B and C. These reliability estimates take into
    account the total number of measurements, coordinate scatter, number
    of frequencies and hour-angle settings at which the source parameters
    have been evaluated. The highly reliable observation results have been
    marked with symbol A . The sources whose parameters can be used
    without an additional analysis are marked with B and sources whose
    parameters are to be used with care have been marked with C.

    data.dat: this file contains the experimental estimates of the source
    coordinates and flux densities as well as their errors at each
    operating frequency of the UTR-2 in the order of their increasing; the
    total number (N) of successive observations according to which the
    estimates were obtained and the number of different hour-angle
    settings (NRA) of the reception pattern at which the source was
    observed. In cases when the observations did not allow us to obtain a
    reliable estimates of a source flux density the catalogue contains
    only their upper limits which are not accompanied by errors. The
    approximated values of as well as low-frequency spectral indices are
    presented only for those sources which have flux density estimates
    obtained at not less than three different UTR-2 frequencies.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
mean.dat         112     1819   Averaged values and cross-identifications
data.dat          59     8094   Experimental estimates at each operating
                                  frequency of the  UTR-2


Byte-by-byte Description of file: mean.dat

   Bytes Format Units  Label    Explanations

   1- 13  A13   ---    Name    *Source name (individual data in file data.dat)
  15- 16  I2    h      RAh      Right ascension (1950)
  18- 19  I2    min    RAm      Right ascension (1950)
  21- 22  I2    s      RAs      Right ascension (1950)
  24- 26  I3    s      e_RAs    rms uncertainty on RAs
  28- 33  F6.2  deg    DEdeg    Declination (1950)
  35- 39  F5.2  deg    e_DEdeg  rms uncertainty on DEdeg
  41- 44  F4.1  MHz    Freq     ? Frequency
      46  A1    ---    l_S      Limit flag on fLux density
  47- 50  I4    Jy     S        ? Flux-density at frequency Freq
  52- 54  I3    %      e_S      ? rms uncertainty on flux density
  62- 65  F4.1  ---    SI       ? Low-frequency spectral index
  67- 69  F3.1  ---    e_SI     ? rms uncertainty on SI
      71  A1    ---    W       *[ABC] Integrated estimate of reliability
  74-112  A39   ---  OtherName  Other names

Note on Name: the name includes the publication number (2,5,7,9,11),
     "GRB" (the B indicates that 1950 positions are used in the name).
     hours and minutes of RA(1950), and degrees of Declination(1950).
     Up to 6 lines in file data.dat contain the experimental estimates
     of the source coordinates and flux densities as well as their errors
     at each operating frequency of the UTR-2.
Note on W: the reliability index takes the values:
     A: Highly reliable data
     B: Results that can be used without an additional analysis
     C: Data requiring additional analysis, up to an examination of the
        original analogue records


Byte-by-byte Description of file: data.dat

   Bytes Format Units  Label    Explanations

   1- 13  A13   ---    Name    *Source name, as in file mean.dat
  15- 16  I2    h      RAh      Right ascension (1950)
  18- 19  I2    min    RAm      Right ascension (1950)
  21- 22  I2    s      RAs      Right ascension (1950)
  24- 26  I3    s      e_RAs    rms uncertainty on RAs
  28- 33  F6.2  deg    DEdeg    Declination (1950)
  35- 39  F5.2  deg    e_DEdeg  rms uncertainty on DEdeg
  41- 44  F4.1  MHz    Freq     Frequency
      46  A1    ---    l_S      Limit flag on fLux density
  47- 50  I4    Jy     S        Flux-density at frequency Freq
  52- 54  I3    %      e_S      ? rms uncertainty on flux density
  56- 57  I2    ---    N        Total number of successful measurements
      59  I1    ---    NRA      Number of angular positions on RA of the
                                   reception pattern at which the source was
                                   observed

Note on Name: the name includes the publication number (2,5,7,9,11),
     "GRB" (the B indicates that 1950 positions are used in the name).
     hours and minutes of RA(1950), and degrees of Declination(1950).
     Up to 6 lines in file data.dat contain the experimental estimates
     of the source coordinates and flux densities as well as their errors
     at each operating frequency of the UTR-2.


Acknowledgements:
     For any information concerning to the  UTR-2 Very Low-Frequency Sky
     Survey, please, contact to:
                                 Dr. K.P. Sokolov
                                 Institute of Rsdio Astronomy
                                 4, Krasnoznamennaya Street
                                 Kharkov 310002
                                 UKRAINE
     E-mail:rai@ira.kharkov.ua
     FAX:   38 (0572) 47-65-06
     Phone: 38 (0572) 45-10-14 (office),  38 0572-44-09-37 (home)

References:
  Braude S.Ya. et al., Paper I., The UTR-2 Radio Telescope.
           Experimental Techniques and Data Processing     =1978Ap&SS..54....3B
  Braude S.Ya. et al., Paper II., 10° < DE < 20°   =1978Ap&SS..54...37B
  Braude S.Ya. et al., Paper IV., Spectra                  =1978Ap&SS..54..145B
  Braude S.Ya. et al., Paper V.,   0° < DE < 10°   =1979Ap&SS..64...73B
  Braude S.Ya. et al., Paper VI., Spectra                  =1979Ap&SS..64..127B
  Braude S.Ya. et al., Paper VII., -2°< DE ←13°   =1981Ap&SS..74..409B
  Braude S.Ya. et al., Paper VIII., Spectra                =1981Ap&SS..76..279B
  Braude S.Ya. et al., Paper IX., 52° < DE < 60°   =1985Ap&SS.111....1B
  Braude S.Ya. et al., Paper X., Spectra                   =1985Ap&SS.111..237B
  Braude S.Ya. et al., Paper XI., 41° < DE < 52°   =1994Ap&SS.213....1B
  Braude S.Ya. et al., Paper XII., Spectra                 =1995Ap&SS.226..245B
(End)     K.P. Sokolov [Ukrainia], Francois Ochsenbein [CDS]         15-Sep-1997