ZTF light curves of SDSS1335+0728. Left: ZTF forced photometry light curve at the position of SDSS1335+0728 in the g (green circles) and r (red stars) bands. The light curves have been binned using a bin of three days. The black dashed line marks the day when SDSS1335+0728 started triggering alerts in the ZTF alert stream. The green and red dashed lines show the results of the power-law decay fit (with their respective uncertainties shown in light grey). We obtain power-law indices p of −0.17 ± 0.03 and −0.14 ± 0.03 in the g and r bands, respectively. Right: g (green), and r (red) band light curves obtained after normalising by the power-law decay fit.