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We present a model for gamma-ray bursts where a dissipative photosphereprovides the usual spectral peak around MeV energies accompanied by asubdominant thermal component. We treat the initial acceleration of the jet ina general way, allowing for magnetic field- and baryon dominated outflows. Inthis model, the GeV emission associated with GRBs observed by Fermi LAT, arisesas the interaction of photospheric radiation and the shocked electrons at thedeceleration radius. Through recently discovered correlations between thethermal and non-thermal peaks within individual bursts, we are able to inferwhether the jet was Poynting flux or baryon dominated.

Hints of the jet composition in gamma-ray bursts from dissipative photosphere models