Document Type
Article
Publication Date
6-4-2018
Publication Title
The Astrophysical Journal
Volume
859
Issue
2
First page number:
1
Last page number:
8
Abstract
Gamma-ray burst (GRB) 120729A was detected by Swift/BAT and Fermi/GBM, and then rapidly observed by Swift/XRT, Swift/UVOT, and ground-based telescopes. It had a single long and smooth \gamma-ray emission pulse, which extends continuously to the X-rays. We report Lick/KAIT observations of the source, and make temporal and spectral joint fits of the multiwavelength light curves of GRB 120729A. It exhibits achromatic light-curve behavior, consistent with the predictions of the external shock model. The light curves are decomposed into four typical phases: onset bump (Phase I), normal decay (Phase II), shallow decay (Phase III), and post-jet break (Phase IV). The spectral energy distribution (SED) evolves from prompt \gamma-ray emission to the afterglow with photon index from Γγ=1.36 to Γ≈1.75. There is no obvious evolution of the SED during the afterglow. ...(Please see article full tet for complete abstract.)
Keywords
Gamma-ray burst: General; Gamma-ray burst: Individual (GRB 120729A); Methods: Observational; Radiation mechanisms: Non-thermal
Disciplines
Astrophysics and Astronomy
File Format
application/pdf
File Size
728 Kb
Language
English
Creative Commons License
This work is licensed under a Creative Commons Attribution 3.0 License.
Repository Citation
Huang, L.,
Wang, X.,
Zheng, W.,
Liang, E.,
Lin, D.,
Zhong, S.,
Zhang, H.,
Huang, X.,
Filippenko, A. V.,
Zhang, B.
(2018).
GRB 120729A: External Shock Origin for Both the Prompt Gamma-Ray Emission and Afterglow.
The Astrophysical Journal, 859(2),
1-8.
http://dx.doi.org/10.3847/1538-4357/aaba6e