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arXiv 0907.0714astro-ph.HE
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GRB 080916 C高能gamma-ray辐射的费米观测

Fermi Observations of high-energy gamma-ray emissions from GRB 080916C

Hiroyasu Tajima

摘要:

用费米伽马射线暴监测仪和大面阵望远镜对长持续时间的伽马射线暴GRB 080916 C进行了观测,发现它在8 - 13.2 GeV之间具有单一的谱型。E>100 MeV的发射比E<1 MeV的发射晚约5 s,并且即使在E<100 MeV的光子变得不可检测之后也持续更长时间。相对于GROND的红移约为4.35,这意味着该伽玛暴具有最大的已报道的各向同性伽马射线能量释放,E_{iso}约为8.8 x10^{54}尔格。它还对伽玛射线暴外流洛伦兹因子设定了严格的下限,Gamma_{min} ~890,并限制了量子引力质量标度,M_{QG} > 1.3 x 10^{18} GeV/c^2。

英文摘要:

Observations of the long-duration Gamma-Ray Burst GRB 080916C by the Fermi Gamma-ray Burst Monitor and Large Area Telescope show that it has a single spectral form from 8 keV to 13.2 GeV. The E>100 MeV emission was ~5 s later than the E<1 MeV emission and lasted much longer even after photons with E<100 MeV became undetectable. The redshift from GROND of z~4.35 means that this GRB has the largest reported apparent isotropic gamma-ray energy release, E_{iso} ~ 8.8 x10^{54} ergs. It also sets a stringent lower limit on the GRB outflow Lorentz factor, Gamma_{min}~890, and limits the quantum gravity mass scale, M_{QG} > 1.3 x 10^{18} GeV/c^2.

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