We report first results from an ongoing monitoring campaign to measure time delays between the six images of the quasar SDSS J2222 + 2745 , gravitationally lensed by a galaxy cluster .
The time delay between A and B , the two most highly magnified images , is measured to be \tau _ { AB } = 47.7 \pm 6.0 days ( 95 % confidence interval ) , consistent with previous model predictions for this lens system .
The strong intrinsic variability of the quasar also allows us to derive a time delay value of \tau _ { CA } = 722 \pm 24 days between image C and A , in spite of modest overlap between their light curves in the current data set .
Image C , which is predicted to lead all the other lensed quasar images , has undergone a sharp , monotonic flux increase of 60-75 % during 2014 .
A corresponding brightening is firmly predicted to occur in images A and B during 2016 .
The amplitude of this rise indicates that time delays involving all six known images in this system , including those of the demagnified central images D-F , will be obtainable from further ground-based monitoring of this system during the next few years .