IVOA and ADASS?

[Roy Williams]

Arnold Rots wrote:
> (2) Time is already properly defined in WhereWhen; why deviate from
>     that standard?
>   

Good point. The time standards for VOEvent are defined as a subset of 
the STC standard. To quote the specification:

The *coord_system_id* is built from a time part, a space part, and a 
center specification, concatenated ion that order with hyphen as a 
separator.

    * The time part can be UTC (Universal Time) or TT (Terrestrial
      Time). Currently, TT - UTC = 65.185 seconds.
    * The space part can be "FK5" or "ICRS" (for which the coordinates
      are right ascension and declination),
    * The center specification can be TOPO (surface of the Earth), GEO
      (geocentric coordinates), or BARY (barycentric coordinates).




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