Fig. A.1.
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Our eight-band NIRCAM images of the location of GRB 250314A. The source is undetected in the bluest F090W band, consistent with the z > 7 origin. A clear signature from an extended object is present in the F150W2 observations (with a very broad filter), with a blue colour between F150W2 and F200W. The source is much brighter in the NIRCAM red channel, and brightens consistently between F277W and F444W.
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