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Aims: With this paper we want to investigate the highly variable afterglowlight curve and environment of gamma-ray burst (GRB) 060526 at $z=3.221$.Methods: We present one of the largest photometric datasets ever obtained for aGRB afterglow, consisting of multi-color photometric data from the ultravioletto the near infrared. The data set contains 412 data points in total to whichwe add additional data from the literature. Furthermore, we presentlow-resolution high signal-to-noise spectra of the afterglow. The afterglowlight curve is modeled with both an analytical model using broken power lawfits and with a broad-band numerical model which includes energy injections.The absorption lines detected in the spectra are used to derive columndensities using a multi-ion single-component curve-of-growth analysis fromwhich we derive the metallicity of the host of GRB 060526. Results: Thetemporal behaviour of the afterglow follows a double broken power law withbreaks at $t=0.090\pm0.005$ and $t=2.401\pm0.061$ days. It shows deviationsfrom the smooth set of power laws that can be modeled by additional energyinjections from the central engine, although some significant microvariabilityremains. The broadband spectral-energy distribution of the afterglow shows nosignificant extinction along the line of sight. The metallicity derived from\ion{S}{II} and \ion{Fe}{II} of [S/H] = --0.57 $\pm$0.25 and [Fe/H] =--1.09$\pm$0.24 is relatively high for a galaxy at that redshift but comparableto the metallicity of other GRB hosts at similar redshifts. At the position ofthe afterglow, no host is detected to F775W(AB) = 28.5 mag with the HST,implying an absolute magnitude of the host M(1500 \AA{})$>$--18.3 mag which isfainter than most long-duration hosts, although the GRB may be associated witha faint galaxy at a distance of 11 kpc.

Photometry and spectroscopy of GRB 060526: A detailed study of the afterglow and host galaxy of a z=3.2 gamma-ray burst