source photometry we measure for JD2 in images with the galaxy subtracted is 22.36, 21.95, 21.72 and 21.64 AB mag. The difference between these values and those quoted in Table 2 can be attributed almost entirely to the difficulty in measuring the absolute sky background. Thus, we provide photometric uncertainties of 0.15 mag for all 4 bands.

Revisiting the Optical/Near-Infrared Photometric Fits
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We first evaluate the quality of the fits to the optical/near-infrared photometry at $z=0.6$ using the @BC03 population synthesis models. The range of parameter space for the models was solar and 0.2 solar metallicity, 19 e-folding timescales ($\tau$) for the starburst from an instantaneous starburst to constant star-formation, ages ($t$) from 0.1 Myr to the age of the Universe at the chosen redshift and extinction (A$_{\rm V}$) between 0 and 10 mags. At $z=0.6$, the 8[$\mu$m]{} flux density is affected by dust emission and is ignored in the fits.

If JD2 is a $z=0.6$ starburst like NGC6240 but with silicate absorption which suppresses the observed 16[$\mu$m]{} flux density, the weakness/non-detection of the source in the $BViz$ passbands requires A$_{\rm V}$=9.9 mag of visual extinction irrespective of whether we adopt the @Dunlop or @Mobasher photometry. This is not 