Predicted thermal X-ray light curve for Run 3 (in blue), compared to that inferred from Swift/XRT (in black, reproduced from Orlando & Drake 2012). A comparison with the results of multi-dimensional hydrodynamical simulations showed that our model is unable to account for the complexity of the emission rise. Only the average luminosity past three weeks, the solid part of the curve, was therefore used as a constraint on the non-thermal processes.