  The Swift discovered GRB080319B was by far the most distant source ever
observed at naked eye brightness, reaching a peak apparent magnitude of 5.3 at
a redshift of z=0.937. We present our late-time optical (HST, Gemini & VLT) and
X-ray (Chandra) observations, which confirm that an achromatic break occurred
in the power-law afterglow light curve at ~11 days post-burst. This most likely
indicates that the gamma-ray burst (GRB) outflow was collimated, which for a
uniform jet would imply a total energy in the jet E_{jet} \gsim 10^{52} erg.
Our observations also show a late-time excess of red light, which is well
explained if the GRB was accompanied by a supernova (SN), similar to those seen
in some other long-duration GRBs. The latest observations are dominated by
light from the host and show that the GRB took place in a faint dwarf galaxy
(r(AB)\approx27.0, rest-frame M_B\approx-17.2). This galaxy is small even by
the standards of other GRB hosts, which is suggestive of a low metallicity
environment. Intriguingly, the properties of this extreme event - a small host
and bright supernova - are entirely typical of the very low-luminosity bursts
such as GRB980425 and GRB060218.
