The soft-hard-flat spectral evolution in GRB 250404A/EP250404a traces the transition from the fading prompt emission to the external-shock afterglow, with the X-ray prompt phase lasting about 300 s.
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Spectral Hardening Reveals Afterglow Emergence in Long-Duration Fast X-ray Transients: A Case Study of GRB 250404A/EP250404a
The soft-hard-flat spectral evolution in GRB 250404A/EP250404a traces the transition from the fading prompt emission to the external-shock afterglow, with the X-ray prompt phase lasting about 300 s.