New Insights into Gamma-ray Burst Polarization from GRB 180720B

Recent research has provided significant insights into the polarization of gamma-ray bursts (GRBs), specifically focusing on GRB 180720B. The study, titled "Polarization Measurement of Gamma-ray Bursts with Fermi-GBM: The Case of GRB 180720B," utilized the Fermi Gamma-ray Burst Monitor (GBM) to analyze the polarimetric properties of this bright GRB. The researchers detected photons that scattered off Earth's atmosphere, allowing them to differentiate between polarized and unpolarized gamma-ray emissions.

The findings indicate a polarization degree (PD) of 72% with considerable uncertainties, and a polarization angle (PA) of 91 degrees. Notably, the PA aligns with earlier optical measurements taken shortly after the burst's prompt emission, suggesting a consistent method for future studies. This research supports the hypothesis that some GRBs may exhibit high polarization levels, a notion that could reshape our understanding of these cosmic events.

The implications of these findings are profound, as they not only enhance our comprehension of GRBs but also pave the way for future dedicated polarimetric studies. Upcoming instruments designed specifically for GRB polarization measurement could further validate these results and expand our knowledge of the mechanisms driving these powerful cosmic phenomena. The full study can be accessed through arXiv at arXiv:2408.13199.