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    • Leo Pound Singer's avatar
      Document integer OBJECT fields in bayestar-localize-coincs · 6dd6a5e1
      Leo Pound Singer authored
      The script `bayestar-localize-coincs` saves FITS files with
      integer-valued `OBJECT` cards in their FITS headers. This is
      somewhat unusual, because the `OBJECT` card is usually a string
      used to give the designation of an astronomical object (such as
      `M83` or `Feige 55`). The `OBJECT` cards saved by
      `bayestar-localize-coincs`, on the other hand, are integers that
      refer to a coinc_event table row in the input LIGO-LW file. Add
      an explanation to the `bayestar-localize-coincs` command-line
      help message and also to the `COMMENT` in the FITS header.
      
      Here is an example FITS headere generated by
      `bayestar-localize-coincs`:
      
      ```
      SIMPLE  =                    T / conforms to FITS standard
      BITPIX  =                    8 / array data type
      NAXIS   =                    0 / number of array dimensions
      EXTEND  =                    T
      
      XTENSION= 'BINTABLE'           / binary table extension
      BITPIX  =                    8 / array data type
      NAXIS   =                    2 / number of array dimensions
      NAXIS1  =                   40 / length of dimension 1
      NAXIS2  =                19200 / length of dimension 2
      PCOUNT  =                    0 / number of group parameters
      GCOUNT  =                    1 / number of groups
      TFIELDS =                    5 / number of table fields
      TTYPE1  = 'UNIQ    '
      TFORM1  = 'K       '
      TTYPE2  = 'PROBDENSITY'
      TFORM2  = 'D       '
      TUNIT2  = 'sr-1    '
      TTYPE3  = 'DISTMU  '
      TFORM3  = 'D       '
      TUNIT3  = 'Mpc     '
      TTYPE4  = 'DISTSIGMA'
      TFORM4  = 'D       '
      TUNIT4  = 'Mpc     '
      TTYPE5  = 'DISTNORM'
      TFORM5  = 'D       '
      TUNIT5  = 'Mpc-2   '
      PIXTYPE = 'HEALPIX '           / HEALPIX pixelisation
      ORDERING= 'NUNIQ   '           / Pixel ordering scheme: RING, NESTED, or NUNIQ
      COORDSYS= 'C       '           / Ecliptic, Galactic or Celestial (equatorial)
      MOCORDER=                    9 / MOC resolution (best order)
      INDXSCHM= 'EXPLICIT'           / Indexing: IMPLICIT or EXPLICIT
      OBJECT  =                    0 / Unique identifier for this event
      INSTRUME= 'H1,L1,V1'           / Instruments that triggered this event
      DATE-OBS= '2012-07-17T22:13:12.220679' / UTC date of the observation
      MJD-OBS =    56125.92583588749 / modified Julian date of the observation
      DATE    = '2020-09-25T17:26:49.000000' / UTC date of file creation
      CREATOR = 'BAYESTAR'           / Program that created this file
      ORIGIN  = 'LIGO/Virgo'         / Organization responsible for this FITS file
      RUNTIME =         53.403897459 / Runtime in seconds of the CREATOR program
      DISTMEAN=     299.256659137929 / Posterior mean distance (Mpc)
      DISTSTD =    92.05707284960283 / Posterior standard deviation of distance (Mpc)
      LOGBCI  =    4.326877727439793 / Log Bayes factor: coherent vs. incoherent
      LOGBSN  =    7.485118470191388 / Log Bayes factor: signal vs. noise
      VCSVERS = 'ligo.skymap 0.5.1.dev5+g5fa79380.d20200925' / Software version
      HISTORY
      HISTORY Generated by calling the following Python function:
      HISTORY ligo.skymap.bayestar.localize(event=..., waveform='o2-uberbank', f_low=3
      HISTORY 0, min_inclination=0.0, max_inclination=1.5707963267948966, min_distance
      HISTORY =None, max_distance=None, prior_distance_power=2, cosmology=False, mcmc=
      HISTORY False, chain_dump=None, enable_snr_series=True, f_high_truncate=0.95)
      HISTORY
      HISTORY This was the command line that started the program:
      HISTORY bayestar-localize-coincs runs/O3/bns_astro/events.xml.gz --coinc-event-i
      HISTORY d 0 -o /tmp
      COMMENT
      COMMENT The integer value in the OBJECT card in this FITS header is a row ID
      COMMENT that refers to a coinc_event table row in the input LIGO-LW document.
      COMMENT
      ```
      6dd6a5e1
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