The observations of the exceptionally bright gamma-ray burst (GRB) 130427A by the Large Area Telescope aboard the Fermi Gamma-ray Space Telescope provide constraints on the nature of these unique astrophysical sources. GRB 130427A had the largest fluence, highest-energy photon (95 GeV), longest γ-ray duration (20 hours), and one of the largest isotropic energy releases ever observed from a GRB. Temporal and spectral analyses of GRB 130427A challenge the widely accepted model that the nonthermal high-energy emission in the afterglow phase of GRBs is synchrotron emission radiated by electrons accelerated at an external shock.
- Pub Date:
- January 2014
- ASTRONOMY Physics, Astronomy, Applied-Physics;
- Astrophysics - High Energy Astrophysical Phenomena
- 30 pages, 6 figures. Accepted for publication in Science. Corresponding authors: S. Zhu (email@example.com)