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arXiv · 1305.1261

High energy emission of GRB 130427A: evidence for inverse Compton radiation

Yi-Zhong Fan·P. H. T. Tam·Fu-Wen Zhang·Yun-Feng Liang·Hao-Ning He·Bei Zhou·Rui-Zhi Yang·Zhi-Ping Jin·Da-Ming Wei
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Abstract

A nearby super-luminous burst GRB 130427A was simultaneously detected by six $γ$-ray space telescopes ({\it Swift}, Fermi-GBM/LAT, Konus-Wind, SPI-ACS/INTEGRAL, AGILE and RHESSI) and by three RAPTOR full-sky persistent monitors. The isotropic $γ-$ray energy release is of $\sim 10^{54}$ erg, rendering it the most powerful explosion among the GRBs with a redshift $z\leq 0.5$. The emission above 100 MeV lasted about one day and four photons are at energies greater than 40 GeV. We show that the count rate of 100 MeV-100 GeV emission may be mainly accounted for by the forward shock synchrotron radiation and the inverse Compton radiation likely dominates at GeV-TeV energies. In particular, an inverse Compton radiation origin is established for the $\sim (95.3,~47.3,~41.4,~38.5,~32)$ GeV photons arriving at $t\sim (243,~256.3,~610.6,~3409.8,~34366.2)$ s after the trigger of Fermi-GBM. Interestingly, the external-inverse-Compton-scattering of the prompt emission (the second episode, i.e., $t\sim 120-260$ s) by the forward-shock-accelerated electrons is expected to produce a few $γ-$rays at energies above 10 GeV, while five were detected in the same time interval. A possible unified model for the prompt soft $γ-$ray, optical and GeV emission of GRB 130427A, GRB 080319B and GRB 090902B is outlined. Implication of the null detection of $>1$ TeV neutrinos from GRB 130427A by IceCube is discussed.

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Yi-Zhong Fan, P. H. T. Tam, Fu-Wen Zhang, Yun-Feng Liang, Hao-Ning He, Bei Zhou, Rui-Zhi Yang, Zhi-Ping Jin, Da-Ming Wei. 2013-08-22. High energy emission of GRB 130427A: evidence for inverse Compton radiation. https://doi.org/10.1088/0004-637x%2F776%2F2%2F95

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