The Gran Telescopio Canarias OSIRIS Broad Band First Data Release
  We present the first release of GTC OSIRIS Broad Band data archive. This is
an effort conducted in the framework of the Spanish Virtual Observatory to help
optimize science from the Gran Telescopio Canarias Archive. Data Release 1
includes 6 788 broad-band images in the Sloan griz filters obtained between
April 2009 and January 2014 and the associated catalogue with roughly 6.23
million detections of more than 630 000 unique sources. The catalogue contains
standard PSF and Kron aperture photometry with a mean accuracy better than 0.09
and 0.15 mag, respectively. The relative astrometric residuals are always
better than 30 mas and better than 15 mas in most cases. The absolute
astrometric uncertainty of the catalogue is of 0.12 arcsec. In this paper we
describe the procedure followed to build the image archive and the associated
catalogue, as well as the quality tests carried out for validation. To
illustrate some of the scientific potential of the catalogue, we also provide
two examples of its scientific exploitation: discovery and identification of
asteroids and cool dwarfs.
