Brightness measurements of the discovered object (red lines) and the comparison star (black lines) obtained from the HST WFC3/IR observations in F160W filter (upper panel) and F110W filter (middle panel) in comparison with I-band variations predicted from the long-term OGLE data (lower panel). Sections correspond to the start–end moments of the executed single HST exposures. The measured brightness variations exceed 0.6 mag and are in agreement with the predictions from OGLE. The nearby comparison star seems to be constant.