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Gamma-ray bursts (GRBs) and GeV-TeV selected radio loud Active GalacticNuclei (AGNs) are compared based on our systematic modeling of the observedspectral energy distributions of a sample of AGNs with a single-zone leptonicmodel. We show that the correlation between the jet power (P_{jet}) and theprompt gamma-ray luminosity (L_{jet}) of GRBs is consistent, within theuncertainties, with the correlation between jet power and the synchrotron peakluminosity (L_{s, jet}) of flat spectrum radio quasars (FSRQs). Their radiationefficiencies (\varepsilon) are also comparable (>10% for most sources), whichincrease with the bolometric jet luminosity (L_{bol,jet}) for FSRQs and withthe L_{jet} for GRBs with similar power-law indices. BL Lacs do not follow theP_{jet}-L_{s, jet} relation of FSRQs. They have lower \varepsilon and L_{bol,jet} values than FSRQs, and a tentative L_{bol, jet}-\varepsilon relation isalso found, with a power-law index being different from that of the FSRQs. Themagnetization parameters (\sigma) of FSRQs are averagely larger than that of BLLacs. They are anti-correlated with $\varepsilon$ for the FSRQs, but positivecorrelated with \varepsilon for the BL Lacs. GeV Narrow-line Seyfert 1 galaxiespotentially share similar properties with FSRQs. Based on the analogy betweenGRBs and FSRQs, we suggest that the prompt gamma-ray emission of GRBs is likelyproduced by synchrotron process in a magnetized jet with high radiationefficiency, similar to FSRQs. The jets of BL Lacs, on the other hand, are lessefficient and are likely more matter dominated.

Radiation Mechanism and Jet Composition of Gamma-Ray Bursts and GeV-TeV selected Radio Loud Active Galactic Nuclei