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

2; (2) NASA Goddard Space Flight Center; 3; (3) University of Maryland College Park; 4); (4) Center for Research; C. Kouveliotou; D. H. Hartmann; Exploration in Space Science; J. Granot

arxiv: 1606.07193 · v2 · pith:YKWSYLPPnew · submitted 2016-06-23 · 🌌 astro-ph.HE · astro-ph.CO

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

S. Guiriec (1 , 2 , 3 , 4) , C. Kouveliotou , D. H. Hartmann , J. Granot , K. Asano

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P. Meszaros R. Gill N. Gehrels J. McEnery ((1) George Washington University (2) NASA Goddard Space Flight Center (3) University of Maryland College Park (4) Center for Research Exploration in Space Science Technology)

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classification 🌌 astro-ph.HE astro-ph.CO

keywords emissiongamma-rayopticalpromptgrbscandlesdifferentgamma

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The origin of prompt emission from gamma ray bursts remains to be an open question. Correlated prompt optical and gamma-ray emission observed in a handful of GRBs strongly suggests a common emission region, but failure to adequately fit the broadband GRB spectrum prompted the hypothesis of different emission mechanisms for the low- and high-energy radiations. We demonstrate that our multi-component model for GRB gamma-ray prompt emission provides an excellent fit to GRB 110205A from optical to gamma-ray energies. Our results show that the optical and highest gamma-ray emissions have the same spatial and spectral origin, which is different from the bulk of the X- and softest gamma-ray radiation. Finally, our accurate redshift estimate for GRB 110205A demonstrates promise for using GRBs as cosmological standard candles.

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

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