POLAR-2, the next generation of GRB polarization detector
Nicolas Produit, Merlin Kole, Xin Wu, Nicolas De Angelis, Hancheng Li, Dominik Rybka, Agnieszka Pollo, Slawomir Mianowski, Jochen Greiner, J. Michael Burgess, J… 展开作者
Nicolas Produit, Merlin Kole, Xin Wu, Nicolas De Angelis, Hancheng Li, Dominik Rybka, Agnieszka Pollo, Slawomir Mianowski, Jochen Greiner, J. Michael Burgess, Jianchao Sun, Shuang-Nan Zhang
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Proceeding from the 38th International Cosmic Ray Conference (ICRC2023), 8 pages, 6 figures
POLAR-2伽马射线暴（GRB）偏振测量任务是成功POLAR任务的后续。POLAR于2016-2017年在中国天宫二号空间实验室上收集了六个月的数据。通过对14个GRB的偏振研究，POLAR测量到总体较低的偏振，并暗示了GRB偏振时间演化中意想不到的复杂性。GRB偏振的能量依赖测量将由N. de Angelis在GA21-09（8月2日）中展示。这些结果表明需要显著提高精度的测量。此外，最近引力波的发现及其与GRB的联系，证明需要一种高精度GRB偏振计，它既能提供高精度偏振测量，又能探测非常暗弱的GRB。POLAR-2偏振计基于与POLAR相同的康普顿散射测量原理，但能量范围更广，偏振事件的总有效面积提高了一个数量级。该设备由瑞士、中国、波兰和德国联合提出和开发，被选用于中国空间站安装，计划于2025年开始运行至少2年。
英文摘要：
The POLAR-2 Gamma-Ray Burst (GRB) Polarimetry mission is a follow-up to the successful POLAR mission. POLAR collected six months of data in 2016-2017 on board the Tiangong-2 Chinese Space laboratory. From a polarization study on 14 GRBs, POLAR measured an overall low polarization and a hint for an unexpected complexity in the time evolution of polarization during GRBs. Energy-dependent measurements of the GRB polarization will be presented by N. de Angelis in GA21-09 (August 2nd). These results demonstrate the need for measurements with significantly improved accuracy. Moreover, the recent discovery of gravitational waves and their connection to GRBs justifies a high-precision GRB polarimeter that can provide both high-precision polarimetry and detection of very faint GRBs. The POLAR-2 polarimeter is based on the same Compton scattering measurement principle as POLAR, but with an extended energy range and an order of magnitude increase in total effective area for polarized events. Proposed and developed by a joint effort of Switzerland, China, Poland and Germany, the device was selected for installation on the China Space Station and is scheduled to start operation for at least 2 years in 2025.
POLAR-2 -- Latest Developments of the Next Generation GRB Polarimeter
University of Geneva（日内瓦大学）；Max-Planck Institute for Extraterrestrial Physics（马克斯·普朗克地外物理研究所）；Geneva Observatory, ISDC, University of Geneva（日内瓦天文台，ISDC，日内瓦大学）；National Centre for Nuclear Research（国家核研究中心）；Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences（高能物理研究所粒子天体物理重点实验室，中国科学院）；University of Chinese Academy of Sciences（中国科学院大学）
In-Orbit GRB Identification Using LLM-based model for the CXPD CubeSat
School of Physical Science, University of Chinese Academy of Sciences（中国科学院大学物理科学学院）；School of Astronomy and Space Sciences, University of Chinese Academy of Sciences（中国科学院大学天文与空间科学学院）；National Astronomical Observatories, Chinese Academy of Sciences（中国科学院国家天文台）；Guangxi Key Laboratory for Relativistic Astrophysics, School of Physical Science and Technology, Guangxi University（广西大学物理科学与技术学院相对论天体物理重点实验室）；Zhejiang Lab（之江实验室）；New Cornerstone Science Laboratory, National Astronomical Observatories, Chinese Academy of Sciences（中国科学院国家天文台新基石科学实验室）
Science prospects for SPHiNX - a small satellite GRB polarimetry mission
伽马射线暴（GRB）是每天都在天空中发生的异常明亮的电磁事件。瞬发发射主要由X-/ $γ$ -射线控制。自50多年前发现伽玛暴以来，主要通过光谱和时间测量来研究。发射射流的性质和基本过程还没有很好的理解。一个有希望的前进方向是开发能够表征高能发射线偏振的任务。为此，SPHiNX任务是为小型卫星平台开发的。入射高能辐射（50-600 keV）的偏振特性通过在塑料和Gd $_3$ Al $_2$ Ga $_3$ O $_{12}$（Ce）（GAGG（Ce））晶体的分段阵列中重建康普顿散射相互作用来确定。在为期两年的任务期间，将观测到$\sim$ 200个伽玛暴，其中$\sim$ 50个伽玛暴产生的测量值中，偏振分数的确定相对误差为$\leq$ 10%。与当代特派团相比，这是一个重大改进。这种性能，结合重建伽玛射线暴定位和光谱特性的能力，将允许领先的类之间的歧视排放模型。
