Best-fit SED model (blue) of J1316+2614. The fit uses the new photometry obtained with HST and VLT (black circles) and the one presented in Marques-Chaves et al. (2022, grey squares). The SED of J1316+2614 is dominated by a young stellar population with an age of 5.7 ± 1.0 Myr and a continuous SFR of 898 ± 181 M_⊙ yr⁻¹. The mass formed in this starburst is log($M_{\star }^{\mathrm{young}}/M_{\odot })=9.68\pm 0.03$ with a residual dust attenuation (E(B − V) = 0.03 ± 0.01). The red upper limits represent the maximum flux of the underlying stellar population needed to resolve the emission in the F160W and K_s bands (see Sect. 3.2).