A UNIFIED MODEL for GRB PROMPT EMISSION from OPTICAL to γ-RAYS; EXPLORING GRBs AS STANDARD CANDLES

S. Guiriec, C. Kouveliotou, D. H. Hartmann, J. Granot, K. Asano, P. Mészáros, R. Gill, N. Gehrels, J. McEnery

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Abstract

The origin of prompt emission from gamma-ray bursts (GRBs) remains to be an open question. Correlated prompt optical and γ-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 γ-ray prompt emission provides an excellent fit to GRB 110205A from optical to γ-ray energies. Our results show that the optical and highest γ-ray emissions have the same spatial and spectral origin, which is different from the bulk of the X- and softest γ-ray radiation. Finally, our accurate redshift estimate for GRB 110205A demonstrates promise for using GRBs as cosmological standard candles.

Original languageEnglish (US)
Article numberL8
JournalAstrophysical Journal Letters
Volume831
Issue number1
DOIs
StatePublished - Nov 1 2016

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All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Guiriec, S., Kouveliotou, C., Hartmann, D. H., Granot, J., Asano, K., Mészáros, P., Gill, R., Gehrels, N., & McEnery, J. (2016). A UNIFIED MODEL for GRB PROMPT EMISSION from OPTICAL to γ-RAYS; EXPLORING GRBs AS STANDARD CANDLES. Astrophysical Journal Letters, 831(1), [L8]. https://doi.org/10.3847/2041-8205/831/1/L8