  Like light, gravitational waves can be gravitationally lensed by massive
objects along their travel path. Strong lensing produces several images from
the same binary coalescence and is forecasted to have a promising rate in
ground-based gravitational detectors. To search for this effect in the data,
one would, in principle, have to analyze all the possible combinations of the
individual detected events, whose number will be ever-increasing. To keep up
with the rising computational cost, we propose a fast and precise methodology
to analyze strongly-lensed gravitational wave events. The method works by
effectively using the posterior of the first image as prior for the second
image. Thanks to its increased speed tractability, this method enables the
joint analysis of more than two images. In addition, it opens the door to new
strong lensing studies where a large number of injections is required.
