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Pulse-resolved Classification and Characteristics of Long-duration Gamma-Ray Bursts with Swift-BAT Data. II. Main Bursts versus Extended Emissions

  • Authors: Liang Li, Xiao Wang, Zhi-Li Cui, Cheng-Long Xiao, Wen Li, Yu Wang, Zi-Gao Dai, Rong-Gen Cai

Liang Li et al 2026 The Astrophysical Journal Supplement Series 285 .

  • Provider: AAS Journals

Caption: Figure 2.

Observer-frame distribution comparisons between the ME (G1) and EE (G2) components for the 24 long GRBs in our ME+EE sample. Each panel shows histogram counts (not normalized) for paired episode-level measurements derived in a uniform Swift-BAT bandpass. (a) ﹩{\mathrm{log}}_{10}({T}_{90}\,{{\rm{s}}}^{-1})﹩. (b) Hardness ratio. (c) ﹩{\mathrm{log}}_{10}(\mathrm{MVT}\,{{\rm{s}}}^{-1})﹩, where MVT is the minimum variability timescale measured with the Haar wavelet method. (d) Spectral lag τ (ms) between the 25–50 keV and 15–25 keV bands (positive values indicate that the higher-energy band leads). The ME distributions are shown as filled histograms, and the EE distributions are shown as step histograms. Panel (d) directly compares the ME and EE lag distributions and shows that EE has a broader lag range, although its median is not significantly offset from that of ME.

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