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Caballero-Garcia, M. Jelinek, N. Orekhova, O. Burhonov, P. Ferrero, P.-H. T. Tam, P. Minaev, Q.-W. Tang, R. Aptekar, R. Cunniffe, R. Inasaridze, R. Opiela, R. Sanchez-Ramirez, S. Bondar, S. B. Pandey, S. Jeong, S. Karpov, S. Oates, T. Fatkhullin, V. Rumyantsev, V. Sasyuk, V. V. Sokolov, X.-F. Wu, X.-Y. Wang, Y.-D. Hu, Z. G. Dai","submitted_at":"2016-12-09T17:04:54Z","abstract_excerpt":"The ejecta composition is an open question in gamma-ray bursts (GRB) physics. Some GRBs possess a quasi-thermal spectral component in the time-resolved spectral analysis, suggesting a hot fireball origin. Others show a featureless non-thermal spectrum known as the \"Band\" function, consistent with a synchrotron radiation origin and suggesting that the jet is Poynting-flux-dominated at the central engine and likely in the emission region as well. There are also bursts showing a sub-dominant thermal component and a dominant synchrotron component suggesting a likely hybrid jet composition. 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