INTERPRETATION OF THE UNPRECEDENTEDLY LONG-LIVED HIGH-ENERGY EMISSION OF GRB 130427A

Journal Article · Tue Aug 20 00:00:00 EDT 2013 · Astrophysical Journal Letters

DOI:https://doi.org/10.1088/2041-8205/773/2/L20· OSTI ID:22136594

Ruoyu, Liu; Xiangyu, Wang ^[1]; Xuefeng, Wu ^[2]

---

1. School of Astronomy and Space Science, Nanjing University, Nanjing 210093 (China)
2. Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008 (China)

High-energy photons (>100 MeV) are detected by the Fermi/Large Area Telescope from GRB 130427A up to almost one day after the burst, with an extra hard spectral component discovered in the high-energy afterglow. We show that this hard spectral component arises from afterglow synchrotron self-Compton (SSC) emission. This scenario can explain the origin of >10 GeV photons detected up to {approx}30, 000 s after the burst, which would be difficult to explain via synchrotron radiation due to the limited maximum synchrotron photon energy. The lower energy multi-wavelength afterglow data can be fitted simultaneously by the afterglow synchrotron emission. The implication of detecting the SSC emission for the circumburst environment is discussed.

• OSTI ID: 22136594
• Journal Information: Astrophysical Journal Letters, Vol. 773, Issue 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 2041-8205
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
AFTERGLOW
COMPTON EFFECT
COSMIC GAMMA BURSTS
GEV RANGE
MEV RANGE
PHOTONS
SYNCHROTRON RADIATION
TELESCOPES
WAVELENGTHS