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The complex structure of the light curves of Swift GRBs has made theirinterpretation and that of the blast wave caused by the burst, more difficultthan in the pre-Swift era. We aim to constrain the blast wave parameters:electron energy distribution, p, density profile of the circumburst medium, k,and the continued energy injection index, q. We do so by comparing the observedmulti-wavelength light curves and X-ray spectra of a Swift sample to thepredictions of the blast wave model.  We can successfully interpret all of the bursts in our sample of 10, excepttwo, within the framework of the blast wave model, and we can estimate withconfidence the electron energy distribution index for 6 of the sample.Furthermore we identify jet breaks in half of the bursts. A statisticalanalysis of the distribution of p reveals that, even in the most conservativecase of least scatter, the values are not consistent with a single, universalvalue. The values of k suggest that the circumburst density profiles are notdrawn from only one of the constant density or wind-like media populations.

Swift GRBs and the blast wave model