Spectral properties of Fermi/GBM gamma-ray bursts and the GeV emission detection rate with Fermi/LAT
Spectral properties of Fermi/GBM gamma-ray bursts and the GeV emission detection rate with Fermi/LAT
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Fermi/GBM 伽马射线暴的光谱特性以及 Fermi/LAT 的 GeV 发射探测率
DOI：
10.1007/s11433-010-0030-4
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发表时间：
2010-05
影响因子：
6.4
通讯作者：
Tong XiaoFeng
中科院分区：
文献类型：
--
作者：
Liang EnWei;Lv HouJun;Tong XiaoFeng
利用2009年5月之前探测到的58个Fermi/GBM伽玛暴样本，将GBM伽玛暴的光谱特性与CGRO/BTASE和HETE-2探测到的伽玛暴进行了比较。我们的结果表明，光谱指数分布是非常一致的BATSE观测。然而，Ep分布与用BATSE和HETE-2观察到的Ep分布完全不同。GBM伽玛暴往往比BATSE样品更软，但比HETE-2样品更硬。这可能是由于仪器选择效应和人工样品效应对BATSE样品的影响。由基于Amati关系的光度指标得到的赝红移分布与雨燕伽玛暴的光谱红移分布基本一致。根据观测到的GBM谱估计了LAT对GBM伽玛暴的探测率，推测LAT探测到5个以上光子的GBM伽玛暴与GBM探测到的伽玛暴的爆发比为6%，即在1-300 GeV波段，LAT探测到5个以上光子的GBM伽玛暴的探测率为12个/年。这与费米运转前半年的结果基本一致。与理论预测相比，低探测率是揭示瞬发γ射线辐射机制和粒子加速的关键。
With a sample of 58 Fermi/GBM GRBs detected before 2009 May, we compare the spectral properties of GBM GRBs with those detected by CGRO/BTASE and HETE-2. Our results show that the spectral index distributions are very consistent with those observed by BATSE. However, theEpdistribution is quite different from that observed with BATSE and HETE-2. The GBM GRBs tend to be softer than the BATSE sample, but harder than the HETE-2 sample. This may be due to the instrumental selection effects and artificial sample effect on the BATSE sample. The distribution of the pseudo redshifts derived from the luminosity indicator based on the Amati-relation shows rough consistency with the spectroscopic redshifts of Swift GRBs. We estimate the detection rate of GBM GRBs with LAT based on the observed spectrum in the GBM band, and the inferred burst ratio of LAT detection with over 5 photons to GBM detection is 6%, yielding a detection rate pf 12 GRBs/yr with over 5 photons in the 1–300 GeV band. This is roughly consistent with the results in the first half year of Fermi operation. The low detection rate compared with theoretical predictions is a key for revealing the radiation mechanisms and particle acceleration of the prompt gamma-rays.
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DOI：
--
发表时间：
2009
期刊：
GRB Coordinates Network
影响因子：
--
作者：
M. Ohno;S. Cutini;J. Mcenery;J. Chiang;E. Koerding
通讯作者：
M. Ohno;S. Cutini;J. Mcenery;J. Chiang;E. Koerding
DOI：
10.1046/j.1365-8711.2003.06971.x
发表时间：
2002-12
影响因子：
4.8
作者：
D. Wei;W. Gao
通讯作者：
D. Wei;W. Gao
影响因子：
64.8
作者：
K. Hurley;B. Dingus;B. Dingus;Reshmi Mukherjee;Reshmi Mukherjee;P. Sreekumar;P. Sreekumar;C. K
通讯作者：
K. Hurley;B. Dingus;B. Dingus;Reshmi Mukherjee;Reshmi Mukherjee;P. Sreekumar;P. Sreekumar;C. K
DOI：
10.1086/421285
发表时间：
2003-09
期刊：
The Astrophysical Journal
影响因子：
--
作者：
D. Yonetoku;T. Murakami;T. Nakamura;R. Yamazaki;A. Inoue;K. University;Kyoto University;O. Universit
通讯作者：
D. Yonetoku;T. Murakami;T. Nakamura;R. Yamazaki;A. Inoue;K. University;Kyoto University;O. Universit
影响因子：
2
作者：
R. MacKay
通讯作者：
R. MacKay