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We present Ulysses and NEAR data from the detection of the short orintermediate duration (2 s) gamma-ray burst GRB000301C (2000 March 1.41 UT).The gamma-ray burst (GRB) was localised by the Inter Planetary Network (IPN)and RXTE to an area of 50 arcmin^2. A fading optical counterpart wassubsequently discovered with the Nordic Optical Telescope (NOT) about 42h afterthe burst. The GRB lies at the border between the long-soft and the short-hardclasses of GRBs. If GRB000301C belongs to the latter class, this would be thefirst detection of an afterglow to a short-hard burst. We present UBRI and JHKphotometry from the time of the discovery until 11 days after the burst.Finally, we present spectroscopic observations of the optical afterglowobtained with the ESO VLT Antu telescope 4 and 5 days after the burst. Theoptical light curve is consistent with being achromatic from 2 to 11 days afterthe burst and exhibits a break. A broken power-law fit yields a shallowpre-break decay power-law slope of a_1=-0.72+-0.06, a break time oft_b=4.39+-0.26 days after the burst, and a post-break slope of a_2=-2.29+-0.17,which is best explained by a sideways expanding jet in an ambient medium ofconstant mean density. In the optical spectrum we find absorption features thatare consistent with FeII, CIV, CII, SiII and Ly-a at a redshift of2.0404+-0.0008. We find evidence for a curved shape of the spectral energydistribution of the observed afterglow. It is best fitted with a power-lawspectral distribution with index b ~ -0.7 reddened by an SMC-like extinctionlaw with A_V~0.1 mag. Based on the Ly-a absorption line we estimate the HIcolumn density to be log(N(HI))=21.2+-0.5. This is the first direct indicationof a connection between GRB host galaxies and Damped Ly-a Absorbers.Comment: 13 pages, 11 figures, accepted for publication in A&A. Revised and  updated section on afterglow SED (6.2). Findingchart added. References  update

The afterglow of the short/intermediate-duration gamma-ray burst GRB 000301C: A jet at $\mathsf{{\vec z}=2.04}$