Extended Data Fig. 2: The T90 distributions.
From: A long-duration gamma-ray burst with a peculiar origin
a, The T90 distribution (grey histogram) of the short GRB (T90 < 2 s) sample from the fourth Fermi/GBM catalogue35 fit with a single log-normal distribution (solid black line). GRB 211211A (with 13-s main emission) and GRB 060614 (with 6-s main emission) are highlighted in red and blue, respectively. b, The T90 distribution (grey histogram) of the whole GRB sample from the fourth Fermi/GBM catalogue fit with a two-component log-normal mixture model (solid black line). The two components responsible for short and long GRB populations are shown with grey dashed and dotted lines, respectively. GRB 211211A (with 13-s main emission) and GRB 060614 (with 6-s main emission) are highlighted in red and blue, respectively.
