Fit of the dust extinction, AV, to the spectrum of GRB 151021A. The grey and black lines show the full raw and binned X-shooter spectrum, respectively. The corresponding raw error spectrum is shown as the bottom dark grey line. The spectrum was normalized to the acquisition magnitude overplotted as the orange square. The intrinsic afterglow spectrum derived from the Swift/XRT spectrum with a slope change of Δβ = 0.5 is shown as the blue solid line with the errors on the power-law slope shown as the blue, dashed lines. An extinction curve with the best fit value of AV = 0.20 ± 0.03 mag is shown as the red, solid line and the error on the fit is shown by the red, dashed lines.
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