Search for Polarization from the Prompt Gamma-Ray Emission of GRB 041219a with SPI on INTEGRAL
Search for Polarization from the Prompt Gamma-Ray Emission of GRB 041219a with SPI on INTEGRAL
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DOI：
10.1086/510676
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发表时间：
2006-10
期刊：
影响因子：
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通讯作者：
E. Kalemci;S. Boggs;C. Kouveliotou;M. Finger;M. Baring
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文献类型：
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作者：
E. Kalemci;S. Boggs;C. Kouveliotou;M. Finger;M. Baring
测量伽马射线暴（GRB）瞬发伽马射线发射的偏振可以显着提高我们对伽马射线暴发射机制以及驱动爆炸的潜在引擎的理解。我们使用 INTEGRAL 上的 SPI 仪器搜索了 GRB 041219a 瞬发 γ 射线发射中的偏振。使用 100-350 keV 能带中的多探测器重合事件，我们的分析得出该伽玛射线暴的偏振分数为 98% ± 33%。从统计上看，我们不能声称该来源进行了偏振检测。此外，不同的事件选择标准导致甚至不太显着的极化分数，例如，当分析中包含较高能量时获得较低的极化分数。我们不能强烈排除测量的调制由仪器系统学主导的可能性。因此，GRB 041219a 的 SPI 观测并没有显着约束 GRB 模型。然而，该测量证明了 SPI 测量偏振的能力以及为此分析开发的技术。
Measuring the polarization of the prompt γ-ray emission from gamma-ray bursts (GRBs) can significantly improve our understanding of both the GRB emission mechanisms as well as the underlying engine driving the explosion. We searched for polarization in the prompt γ-ray emission of GRB 041219a with the SPI instrument on INTEGRAL. Using multiple-detector coincidence events in the 100-350 keV energy band, our analysis yields a polarization fraction from this GRB of 98% ± 33%. Statistically, we cannot claim a polarization detection from this source. Moreover, different event selection criteria lead to even less significant polarization fractions, e.g., lower polarization fractions are obtained when higher energies are included in the analysis. We cannot strongly rule out the possibility that the measured modulation is dominated by instrumental systematics. Therefore, SPI observations of GRB 041219a do not significantly constrain GRB models. However, this measurement demonstrates the capability of SPI to measure polarization, as well as the techniques developed for this analysis.