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Fig. C.3.

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Colours of 93 LBGs identified in the JADES, CEERS, and PRIMER deep fields by JWST (Merlin et al. 2024) compared to the colours of GRB 250314A. Although a handful of LBGs do show apparent red colours these do not exhibit the same bluer shape in F150W-F200W, and indeed are dominated by Balmer break-like emission that increases predominantly beyond F277W. We also plot the NIRSPEC spectrum of the LRD MoM-BH1 (Naidu et al. 2025a), which shows a very strong (likely non-stellar) Balmer break, and demonstrates that while very red objects can be found at z ∼ 7, they do not explain the spectral shape seen in GRB 250314A. Finally, we also include a fit to the SED with CIGALE. This provides a reasonable match to the observations, although requires galaxy properties unusual both amongst the z ∼ 7 galaxy population and GRB host galaxies, in particular in requiring the galaxy to be dominated by an ancient stellar population, with a formation redshift of z ∼ 21.

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