For a few month we were analyzing a vast amount of data we acquired thanks to the project and finally we published our results. You can find the article here (https://arxiv.org/abs/1705.06155).
Thanks to a large amount of data, we were able to show that ULXs might indeed be a very short phase of extreme accretion in XRBs and not any exotic objects. Our side-result showed that a non-monotonic relation exist between the number of ULXs in a galaxy and the average metallicity (i.e. fraction of heavy ions in stars), which may be useful for obtaining additional information about stellar populations.
We plan to make further research in this field!
University of Warsaw