What question did this study set out to answer?

To analyze the multi-wavelength properties of GRB 210704A and its associated emission features.

GRB 210704A: A Luminous Fast Blue Transient in a GRB afterglow at z = 2.34

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Detailed analysis reveals optical/infrared emission excess in GRB 210704A, suggesting a connection to gamma-ray bursts and fast blue transients.

To analyze the multi-wavelength properties of GRB 210704A and its associated emission features.
Conducted detailed spectral analysis of the GRB afterglow
Determined the redshift using line stacking and photometric methods
Modelled the excess optical/infrared emission as an energetic refreshed shock
Identified a redshift of z = 2.34 corroborated by photometric data
Observed excess optical/infrared emission peaking around T0 + 7 d
Characterized the emission as extremely luminous with Mr = −22.0 mag, indicating rapid evolution.

Pieterse et al. (2026) studied this question.

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Detailed analysis reveals optical/infrared emission excess in GRB 210704A, suggesting a connection to gamma-ray bursts and fast blue transients.