  Gaia will not observe 50000 brown dwarfs, but about 100 times less. However,
these <~ 500 brown dwarfs will be benchmarks for many substellar topics. It is
possible to identify them in advance and make the list public to all
astronomers worldwide through a virtual observatory-compliant "Gaia brown
dwarf" catalogue. This M-, L- and T-dwarf Archive of Interest for Astrophysics
would tabulate precise Gaia astrometry, multiband photometry, high- and
low-resolution spectroscopy and homogeneously derived astrophysical parameters.
Spanish observatories may play a key role in the catalogue preparation.
