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The origin of prompt emission from gamma ray bursts remains to be an openquestion. Correlated prompt optical and gamma-ray emission observed in ahandful of GRBs strongly suggests a common emission region, but failure toadequately fit the broadband GRB spectrum prompted the hypothesis of differentemission mechanisms for the low- and high-energy radiations. We demonstratethat our multi-component model for GRB gamma-ray prompt emission provides anexcellent fit to GRB 110205A from optical to gamma-ray energies. Our resultsshow that the optical and highest gamma-ray emissions have the same spatial andspectral origin, which is different from the bulk of the X- and softestgamma-ray radiation. Finally, our accurate redshift estimate for GRB 110205Ademonstrates promise for using GRBs as cosmological standard candles.

A Unified Model for GRB Prompt Emission from Optical to $\gamma$-Rays: Exploring GRBs as Standard Candles