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We present UBVRIZJsHKs broad band photometry of the host galaxy of the darkgamma-ray burst (GRB) of February 10, 2000. These observations represent themost exhaustive photometry given to date of any GRB host galaxy. A grid ofspectral templates have been fitted to the Spectral Energy Distribution (SED)of the host. The derived photometric redshift is z=0.842^+0.054_-0.042, whichis in excellent agreement with the spectroscopic redshift (z=0.8463+/-0.0002)proposed by Piro et al. (2002) based on a single emission line. Furthermore, wehave determined the photometric redshift of all the galaxies in an area of6'x6' around the host galaxy, in order to check for their overdensity in theenvironment of the host. We find that the GRB 000210 host galaxy is asubluminous galaxy (L ~ 0.5+/-0.2 L*), with no companions above our detectionthreshold of 0.18+/-0.06 L*. Based on the restframe ultraviolet flux a starformation rate of 2.1+/-0.2 Solar Masses per year is estimated. The best fit tothe SED is obtained for a starburst template with an age of 0.181^+0.037_-0.026Gyr and a very low extinction (Av~0). We discuss the implications of theinferred low value of Av and the age of the dominant stellar population for thenon detection of the GRB 000210 optical afterglow.

A multi-colour study of the dark GRB 000210 host galaxy and its environment