TY - JOUR
T1 - A UNIFIED MODEL for GRB PROMPT EMISSION from OPTICAL to γ-RAYS; EXPLORING GRBs AS STANDARD CANDLES
AU - Guiriec, S.
AU - Kouveliotou, C.
AU - Hartmann, D. H.
AU - Granot, J.
AU - Asano, K.
AU - Mészáros, P.
AU - Gill, R.
AU - Gehrels, N.
AU - McEnery, J.
N1 - Publisher Copyright:
© 2016. The American Astronomical Society. All rights reserved..
PY - 2016/11/1
Y1 - 2016/11/1
N2 - 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.
AB - 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.
KW - acceleration of particles
KW - black hole physics
KW - distance scale
KW - gamma-ray burst: general
KW - radiation mechanisms: non-thermal
KW - radiation mechanisms: thermal
UR - http://www.scopus.com/inward/record.url?scp=84994322969&partnerID=8YFLogxK
U2 - 10.3847/2041-8205/831/1/L8
DO - 10.3847/2041-8205/831/1/L8
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AN - SCOPUS:84994322969
SN - 2041-8205
VL - 831
JO - Astrophysical Journal Letters
JF - Astrophysical Journal Letters
IS - 1
M1 - L8
ER -