Abstract
Abstract
The characteristics of the spectral evolution of the prompt emission of gamma-ray bursts (GRBs), which are closely related to the radiation mechanism (synchrotron or photosphere), are still an unsolved subject. Here, by performing the detailed time-resolved spectral fitting of GRB 131231A, which has a very bright and well-defined single pulse, some interesting spectral evolution features have been found. (i) Both the low-energy spectral index α and the peak energy E
p exhibit the “flux-tracking” pattern (“double-tracking” characteristics). (ii) The parameter relations, i.e., F (the energy flux)-α, F–E
p, and E
p–α, along with the analogous Yonetoku E
p–L
γ,iso relation for the different time-resolved spectra, show strong monotonous (positive) correlations, both in the rising and the decaying phases. (iii) The values of α do not exceed the synchrotron limit (α = −2/3) in all slices across the pulse, favoring the synchrotron origin. We argue that the one-zone synchrotron emission model with the emitter streaming away at a large distance from the central engine can explain all of these special spectral evolution characteristics.
Funder
National Natural Science Foundation of China
Key Program of Frontier Sciences
Strategic Priority Research Program
National Postdoctoral Program for Innovative Talents
China Postdoctoral Science Foundation funded project
Publisher
American Astronomical Society
Subject
Space and Planetary Science,Astronomy and Astrophysics
Cited by
26 articles.
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