FAST Polarization Catalog of FRB 20240114A
Tian-Cong Wang, Jun-Shuo Zhang, Xiao-Hui Liu, Wei-Yang Wang, Pei Wang, He Gao, Di Li, Bing Zhang, Wei-Wei Zhu, Jin-Lin Han, Ke-Jia Lee, Ye Li, Dengke Zhou, Wan-Jin Lu, Jintao Xie, Jianhua Fang, Jin-Huang Cao, Chen-Chen Miao, Yu-Hao Zhu, Yunchuan Chen, Si-Lu Xu, Huaxi Chen

TL;DR
This paper presents a comprehensive polarimetric catalog of over 6,000 bursts from FRB 20240114A, revealing temporal evolution in Faraday rotation and stable polarization properties, indicating a dynamic magneto-ionic environment.
Contribution
The study provides the first extensive, time-resolved polarization catalog of a repeating FRB, including detailed measurements and analysis of polarization evolution and emission geometry.
Findings
RM decreases linearly by ~200 rad/m^2 over 200 days
High linear polarization fraction with a lower bound around 76%
Circular polarization detected in 6.67% of bursts
Abstract
Polarization measurements of fast radio bursts (FRBs) probe the magnetized plasma surrounding their central engines. FRB~20240114A is an exceptionally active repeating source, with 17,356 bursts detected between 2024 January 28 and 2025 May 30 by FAST, enabling time-resolved polarimetric studies. In this work, we present a polarimetric catalog of 6,131 bright bursts (with a signal-to-noise ratio S/N 20, 35.3% of the total sample), including arrival time (MJD), dispersion measure (DM), burst width (W), bandwidth, Faraday rotation measure (RM), linear and circular polarization degrees (DOL, DOC), and intrinsic polarization angle (PA). We detect a clear temporal evolution of RM: after an initial stable phase, it decreases linearly by 200 over 200 days, forming a bimodal distribution, whereas DM remains stable at 528.9 $\rm…
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