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The Swift discovered GRB080319B was by far the most distant source everobserved at naked eye brightness, reaching a peak apparent magnitude of 5.3 ata redshift of z=0.937. We present our late-time optical (HST, Gemini & VLT) andX-ray (Chandra) observations, which confirm that an achromatic break occurredin the power-law afterglow light curve at ~11 days post-burst. This most likelyindicates that the gamma-ray burst (GRB) outflow was collimated, which for auniform 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 wellexplained if the GRB was accompanied by a supernova (SN), similar to those seenin some other long-duration GRBs. The latest observations are dominated bylight 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 bythe standards of other GRB hosts, which is suggestive of a low metallicityenvironment. Intriguingly, the properties of this extreme event - a small hostand bright supernova - are entirely typical of the very low-luminosity burstssuch as GRB980425 and GRB060218.

Late time observations of GRB080319B: jet break, host galaxy and accompanying supernova