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Redshift determination required to compute rest-frame prompt properties

Determine the redshift of GRB220831A to enable calculation of its rest-frame spectral peak energy and isotropic-equivalent gamma-ray energy for robust placement relative to Amati correlations.

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Background

Placement of GRB220831A on rest-frame empirical correlations (e.g., the Amati relation) could aid in distinguishing between collapsar and merger origins. However, rest-frame quantities require a redshift.

The authors estimate a pseudo-redshift by matching observer-frame properties to the Amati relation, but emphasize that without an actual redshift measurement, a definitive assessment of rest-frame properties is not possible.

References

However, without a redshift, we cannot calculate the rest frame properties of GRB220831A.

— GRB$\,$220831A: a hostless, intermediate Gamma-ray burst with an unusual optical afterglow (2411.14749 - Freeburn et al., 22 Nov 2024) in Section 3.2 (The prompt emission)