Comprehensive X-Ray Observations of the Exceptional Ultralong X-Ray and Gamma-Ray Transient GRB 250702B with Swift, NuSTAR, and Chandra: Insights from the X-Ray Afterglow Properties

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Observational analysis revealed X-ray emission from GRB 250702B, suggesting central engine activity lasts over 3 days.

X-ray emission decayed steeply as ∼ t −1.9, and showed variability consistent with flares superposed on a continuum.
Comprehensive X-ray observations were conducted with the Swift Observatory and Chandra X-ray Observatory over 65 days.
Findings imply sustained central engine activity, including early soft-X-ray emission from GRB 250702B.
These results may require reevaluation of GRB origins, including hybrid models involving stellar-mass black holes.

O’Connor et al. (2025) studied this question.

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