Researches On The Gamma-ray Burst Prompt Emission Of POLAR And Fermi

Gamma-ray Bursts（GRBs）are the most energetic stellar explosions in the universe.The observation of GRBs is of significant importance for understanding their physical origin and radiation mechanism.To constrain the prompt radiation mechanism of GRBs,the Gamma-ray Burst Polarimeter（POLAR）was developed by China and Europe.The main content of this paper is about POLAR.This paper is structured as follows.In Chapter 1,we firstly give a review of the observation progress and the major properties of GRBs.Then we briefly introduce the main theoretical models of GRBs and their estimation of polarization.In Chapter 2,the principle and on-orbit situation of POLAR are briefly described at first.POLAR detected many burst events.However,we found there are not only GRBs but also non-GRB events（i.e.solar flare and charged particles etc.）.We compared such burst events and generalized a method to distinguish GRBs and non-GRBs.At last,a summary of POLAR-detected GRBs so far is presented.In Chapter 3,we introduce a low-latency method and pipeline for GRB light curve and spectrum.Based on near real-time Fermi/GBM data,we developed a low-latency pipeline to automatically calculate the temporal and spectral properties of GRBs.With this pipeline,some important parameters can be obtained,such as T₉₀0 and fluence,within²0 min after the GRB trigger.For⁹0%of GRBs,T₉₀0 and fluence are consistent with the GBM catalog results within 2σerrors.This pipeline has been used by the Gamma-ray Bursts Polarimeter（POLAR）and the Insight Hard X-ray Modulation Telescope（Insight-HXMT）to follow up the bursts of interest.In Chapter 4,we sum up our main work and make a brief discussion.