Testing the blast wave model with Swift GRBs
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The complex structure of the light curves of Swift GRBs (e.g. superimposed flares and shallow decay) has made their interpretationand that of the blast wave caused by the burst, more difficult than 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 bycomparing the observed multi-wavelength light curves and X-ray spectra of a Swift sample to the predictions of the blast wave model.We can successfully interpret all of the bursts in our multi-wavelength sample of 10, except two, within the framework of the blastwave model, and we can estimate with confidence the electron energy distribution index for 6 of the sample. Furthermore we identify jetbreaks in almost half of the bursts. The values of k suggest that the circumburst density profiles are not drawn from only one of theconstant density or wind-like media populations. A statistical analysis of the distribution of p reveals that, even in the most conservativecase of least scatter, the values are not consistent with a single, universal value. This is in agreement with our results for a larger sample ofX-ray only afterglows which we summarise here.
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Curran, Peter; Starling, R.; van der Horst, A.; Wijers, R. (2009)The complex structure of the light curves of Swift Gamma-Ray Bursts (GRBs) has made theidentification of breaks, and the interpretation of the blast wave caused by the burst, moredifficult than in the pre-Swift era. We ...
Curran, Peter; Starling, R.; O’Brien, P.; Godet, O.; van der Horst, A.; Wijers, R. (2008)Context. Previously detected in only a few gamma-ray bursts (GRBs), X-ray flares are now observed in ~50% of Swift GRBs, thoughtheir origins remain unclear. Most flares are seen early on in the afterglow decay, while some ...
Curran, Peter; van der Horst, A.; Wijers, R.; Starling, R.; Castro-Tirado, A.; Fynbo, J.; Gorosabel, J.; Jarvinen, A.; Malesani, D.; Rol, E.; Tanvir, N.; Wiersema, K.; Burleigh, M.; Casewell, S.; Dobbie, P.; Guziy, S.; Jakobsson, P.; Jelinek, M.; Laursen, P.; Levan, A.; Mundell, C.; Naranen, J.; Piranomonte, S. (2007)Gamma-ray burst afterglow observations in the Swift era have a perceived lack of achromatic jet breaks compared with the BeppoSAX era. We present our multi-wavelength analysis of GRB060206 as an illustrative example of ...