发表机构
Institute for Nuclear Research of the Russian Academy of Sciences; Lomonosov Moscow State University（俄罗斯科学院核物理研究所; 莫斯科国立大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
该研究更新长伽马射线暴对费米-LAT观测的各向同性伽马射线背景贡献的估计，发现GRB 221009A的多TeV余辉未使长GRB成为IGRB的重要来源。
AI 中文摘要
伽马射线暴（GRB）产生的甚高能光子会被河外背景光吸收，部分再处理为GeV波段辐射。我们利用锚定GeV-TeV数据的GRB 221009A时间积分高能余辉模板，结合明确的瞬时能量与束流缩放关系，更新了长GRB对费米-LAT卫星观测的各向同性伽马射线背景（IGRB）贡献的先前估计。尽管观测到了多TeV余辉，级联成分仅占IGRB的1.6×10⁻⁴；包含直接GeV辐射后最大占比提升至1.1×10⁻³，但结果更依赖于种群平均宽带模板。河外背景光、传播实现方式、内禀光谱截断及种群设定的变化均未改变结论：GRB 221009A的多TeV探测并未使长GRB成为IGRB的重要来源。
英文摘要
Very-high-energy photons from gamma-ray bursts (GRBs) are absorbed by the extragalactic background light and partly reprocessed into the GeV band. We update previous estimates of the long-GRB contribution to the Fermi-LAT isotropic gamma-ray background (IGRB), using a time-integrated high-energy afterglow template of GRB 221009A, anchored by GeV-TeV data, together with an explicitly specified scaling with prompt energy and beaming. Despite the observed multi-TeV afterglow, the cascade component reaches only 1.6e-4 of the IGRB. Including direct GeV emission raises the maximum fraction to 1.1e-3, but makes the result more dependent on the population-averaged broadband template. Variations of the extragalactic background light, propagation implementation, intrinsic spectral cutoff, and population prescription do not change the conclusion: the multi-TeV detection of GRB 221009A does not make long GRBs a significant source of the IGRB.
Comments11 pages, 5 figures. V2: only LaTeX formatting changed
