The POLAR Gamma-Ray Burst Polarization Catalog
Merlin Kole, Nicolas De Angelis, Francesco Berlato, J. Michael, Burgess, Neal Gauvin, Jochen Greiner, Wojtek Hajdas, Han-Cheng Li, Zheng-Heng, Li, Nicolas Produit, Dominik Rybka, Li-Ming Song, Jian-Chao Sun, Jaszek, Szabelski, Teresa Tymieniecka, Yuan-Hao Wang, Bo-Bing Wu

TL;DR
This paper presents the POLAR Gamma-Ray Burst Polarization Catalog, analyzing polarization data from 14 GRBs to understand their emission mechanisms, revealing mostly low polarization but some moderate, rapidly changing polarization signals within individual pulses.
Contribution
It provides the first detailed polarization measurements of GRBs in the 50-500 keV range using POLAR, including time-resolved analysis and a new joint spectral-polarimetric modeling approach.
Findings
Most GRBs show low or zero polarization in time-integrated analysis.
Time-resolved analysis reveals moderate polarization with changing angles within pulses.
Results suggest polarization signals may be washed out in time-integrated data.
Abstract
Despite over 50 years of research, many open questions remain about the origin and nature of GRBs. Polarization measurements of the prompt emission of these extreme phenomena have long been thought to be the key to answering a range of these questions. The POLAR detector was designed to produce the first set of detailed and reliable polarization measurements in an energy range of approximately 50-500 keV. During late 2016 and early 2017, POLAR detected a total of 55 GRBs. Analysis results of 5 of these GRBs have been reported in the past. The results were found to be consistent with a low or unpolarized flux. However, previous reports by other collaborations found high levels of polarization. We study the polarization for all the 14 GRBs observed by POLAR for which statistically robust inferences are possible. Additionally, time-resolved polarization studies are performed on GRBs with…
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