IGC space–time diagram (not in scale) illustrates the relativistic motion of Episode 2 (Γ ≈ 500, thick line) and the non-relativistic Episode 1 (Γ ≈ 1) and Episode 3 (Γ ≈ 2). Emissions from different radii, R1 (~ 1013 cm) and R2 (~ 1016–1017 cm), contribute to the transition point (E). Clearly, the X-ray luminosity originates in the SN remnant or in the newly-born BH, but not in the GRB.
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