EAPSI: Demystifying the Observed Gamma Ray Burst Tracking Between the Peak Energy and Luminosity

伽玛射线暴（GRB）是宇宙中能量最大的事件之一。然而，很多是未知的，这些对象，如关键信息的结构，其准直外流或射流。这一信息很难推断，因为伽玛射线暴观测站无法提供伽玛射线暴相对于探测器的方位信息。本项目将研究一种方法，通过探索观测到的时间分辨光谱峰值能量和伽玛射线暴探测光变曲线之间的跟踪起源，来确定伽玛射线暴几何方位的难以捉摸的信息。运行模拟伽玛射线暴辐射将使我们能够识别跟踪关系和视角之间的相关性，对于一个给定的伽玛射线暴。该项目将在RIKEN与Shigehiro Nagataki博士一起进行。这项合作将建立在该小组以前对喷流结构进行的研究的基础上，并允许使用伽马射线暴的磁流体动力学模拟，这将使我们能够充分探索峰值能量和光度之间的关系。伽玛射线暴辐射传输的模拟将进行后处理蒙特卡罗辐射传输代码。这些编码分别散射流出的每个光子，直到它自由逃逸。这使得光变曲线和光谱计算在各种视角的模拟伽玛射线暴与最小的假设正在进行。一种定量的方法来测量峰值能量和光变曲线强度之间的跟踪将被开发。这将有助于确定跟踪行为的特征如何随着视角的变化而变化。该奖项是东亚和太平洋夏季研究所计划的一部分，由美国国家科学基金会和日本科学促进会共同资助，旨在支持美国研究生的夏季研究。

Gamma Ray Bursts (GRBs) are some of the most energetic events in the universe. However, much is unknown about these objects such as critical information about the structure of their collimated outflow or jet. This information is hard to deduce due to the fact that GRB observatories are unable to provide information related to the orientation of the GRB in relation to the detector. This project will investigate a means to determining the elusive information of GRB geometrical orientation by exploring the origin of the observed tracking between the time resolved spectral peak energy and the light curve of a GRB detection. Running simulations of GRB radiation will allow us to identify a correlation between the tracking relation and the viewing angle for a given GRB. This project will be conducted at RIKEN with Dr. Shigehiro Nagataki. This collaboration will build upon previous studies conducted by the group on jet structure as well as allow for the use of magnetohydrodynamic simulations of GRBs which will allow us to fully explore the relation between the peak energy and the luminosity. The simulations of GRB radiation transfer will be conducted with post-processing Monte Carlo Radiation Transfer codes. These codes individually scatter each photon in an outflow until it freely escapes. This allows for light curves and spectra to be calculated at various viewing angles of the simulated GRB with minimal assumptions being made. A quantitative way to measure the tracking between the peak energy and the light curve intensity will be developed. This will aid in determining how the characteristics of tracking behavior changes as a function of viewing angle.This award, under the East Asia and Pacific Summer Institutes program, supports summer research by a U.S. graduate student and is jointly funded by NSF and the Japan Society for the Promotion of Science.