Swift observations of GRB050128: the early X-ray afterglow
  Swift discovered GRB050128 with the Burst Alert Telescope and promptly pointed its narrow field instruments to monitor the afterglow. X-ray observations started 108 s after the trigger time. The early decay of the afterglow is relatively flat with a temporal decay modeled with a power law with index ~ -0.3. A steepening occurs at later times (~ 1500 s) with a power law index of ~ -1.3. During this transition, the observed X-ray spectrum does not change. We interpret this behaviour as either an early jet break or evidence for a transition from the fast cooling regime to the slow cooling regime in a wind environment. 
S. Campana, L.A. Antonelli, G. Chincarini, S. Covino, G. Cusumano, D.   Malesani, V. Mangano, A. Moretti, C. Pagani, P. Roma...