Evolution of the radio spectral index as observed by Zanardo et al. (2010) during the period between 1517 and 8014 days after explosion (filled circles with errors), extrapolation (black circles without errors) of the linear fit (black line; from the same reference) up to the value αr = 0.5; then the constant αr is assumed. The red solid line represents the spectral index αr calculated by Eq. (8) with the dependence Qt(t) derived from the observed αr with the simple approximate formula (9); this Qt(t) is shown in Fig. 3. Green dashed line represents the case of the steady-state injection.
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