WIDGET: System Performance and GRB Prompt Optical Observations

前50年简史：从GRB瞬时辐射与余辉发现到多信使时代

A Short History of the First 50 Years: from the GRB Prompt Emission and Afterglow Discoveries to the Multimessenger Era

本文回顾了伽马射线暴发现50年来的历史，从Vela和BeppoSAX卫星的早期发现到多信使时代，总结了各卫星与地面实验的贡献及当前未解问题与前景。

Prompt emission polarimetry of Gamma Ray Bursts with ASTROSAT CZT-Imager

X-ray and Gamma-ray polarization measurements of the prompt emission of Gamma-ray bursts (GRBs) are believed to be extremely important for testing various models of GRBs. So far, the available measurements of hard X-ray polarization of GRB prompt emission have not significantly constrained the GRB models, particularly because of the difficulty of measuring polarization in these bands. The CZT Imager (CZTI) onboard {\em AstroSat} is primarily an X-ray spectroscopic instrument that also works as a wide angle GRB monitor due to the transparency of its support structure above 100 keV. It also has …

Characterization of the GRB prompt fundamental plane using Fermi-GBM data

A recent work has found a tight global relation between the GRB prompt fluence, peak flux (based on the optimum time scale determined from the Bayesian Blocks-based analysis) and duration using data from the Fermi Gamma-Ray burst monitor, which they have dubbed as "Fundamental Plane". We quantitatively characterize the tightness of this Fundamental Plane relation by calculating the scatter in dex. We also check for a fundamental plane using the peak flux over time scales of 64 ms, 256 ms and 1024 ms. For our analysis, we incorporate the uncertainties in the above observables and carried out bo…

使用INTEGRAL上的IBIS在GRB 041219 A的瞬时发射中测量可变极化

Variable polarization measured in the prompt emission of GRB 041219A using IBIS on board INTEGRAL

偏振测量提供了对天体物理过程本质的直接洞察。不幸的是，只有少数仪器可用于这种伽马射线能量的测量，并且源需要非常明亮。伽马射线暴（GRB）是理想的候选者，因为它们在有限的时间间隔内具有大的通量，从而最大化可用的信噪比。到目前为止，已经报道了一些偏振测量，声称在伽玛暴的即时发射中存在高度偏振，但统计证据不足。我们使用INTEGRAL卫星上的IBIS望远镜测量了长而明亮的GRB 041219 A在200-800 keV能带的瞬发伽马射线发射的偏振。我们发现了一个可变的偏振度范围从小于4%的第一个峰到43+/-25%的整个第二个峰。两个峰的时间分辨分析表明高程度的偏振，并且第一峰中的零平均偏振可以通过在偏振角度和程度中观察到的快速变化来解释。我们的结果是一致的不同的模型在这些能量的伽玛暴的即时发射，但他们有利于同步辐射从一个相对论流出的磁场，这是相干的角度大小可比的发射区域的角度大小（~1/伽马）。事实上，该模型具有保持高极化水平并产生观察到的变化性的最佳能力。

用于天体物理时间序列及GRB瞬时辐射-余辉关系的Transformer模型

Transformer models for astrophysical time series and the GRB prompt-afterglow relation

本文将Transformer与密集神经网络结合，用于由GRB瞬时辐射预测余辉光变曲线，验证其建模天体物理时间序列因果关系的潜力与局限。