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Published online by Cambridge University Press: 22 July 2013
Long duration Gamma Ray Bursts (LGRB) are thought to originate from massive rotatingstars and the interaction of their expanding jet will be affected by the structure oftheir circumburst medium. In this work we use rotating stellar models of massive stars todetermine the state of circumbust material in various types of progenitor scenarios and wedescribe how this external matter can appear in GRB observations.