Notes. Following the scheme in Sect. 3.1.2, different criteria were applied to find a consistent description of the late-time optical and X-ray afterglow data to reveal the nature of the circumburst medium. The light-curve segments were labelled following Panaitescu (2007, for the designated ID see also Table 2 ((S, J, j)=(spherical expansion, jet with sideways expansion, jet without lateral spreading), (1, 2) = (ν < ν_c, ν > ν_c), (a, b)=(ISM, wind); see also Table 2). If there was a break in the light curve, the segments were tagged with the subscript 1 and 2. The second column lists the light-curve segments and all closure relations that agree with the observational data within 3σ. The third and fourth column show the corresponding measured differences in the temporal and spectral slopes, if available. Their uncertainties are 1σ errors. If a criterion could not be applied or a solution was not found, we crossed the field out. The fifth and sixth columns show the conclusion based on all criteria, i.e., the segment label and the type of circumburst medium. The second last column summarises the results from the literature.

References. (1)  Rykoff et al. (2006); (2)  Cenko et al. (2006); (3)  Burrows et al. (2006); (4)  Mangano et al. (2007) (5)  Krühler et al. (2008); (6)  Racusin et al. (2008); (7)  Rossi et al. (2009); (8)  Krühler et al. (2009); (9)  Kann et al. (2010); (10) Starling et al. (2009); (11)  Greiner et al. (2009b); (12)  Gendre et al. (2010); (13)  McBreen et al. (2010); (14)  Cenko et al. (2010); (15) Šimon et al. (2010); (16)  Rau et al. (2010)