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We constrain the physical composition of the outflows of GRBs 080916C and090510 with the prompt emission data and find that the former is likelymagnetic while the latter may be baryonic. The X-ray and optical afterglowemission of both GRBs can be reasonably fitted using the standard externalshock model but the density profiles of the circum-burst medium are different.We also propose a simple method to estimate the number of the seed photonssuppose the GeV afterglow photons are due to the inverse Compton radiation ofexternal forward shock electrons. The seed photons needed in the modeling aretoo many to be realistic for both events. The synchrotron radiation of theforward shock seems able to account for the GeV afterglow data.

GRB 080916C and GRB 090510: the high energy emission and the afterglow