text:   ULX7 and a new transient ULX",6,"['New paper on arXiv today! What we found when we asked @NASASwift to look at the M51 galaxies repeatedly over the last year and a half - <LINK>', 'M51 is a pair of merging galaxies, each with an accreting supermassive black hole (SMBH) at its center, plus several ultraluminous X-ray sources (ULXs). We know 2 of these ULXs are powered by neutron stars, a million times less massive then the SMBHs! https://t.co/jRBnELffbW', 'We got great long-term X-ray lightcurves of all these sources https://t.co/F7XlzXls3P', 'The X-ray lightcurve of one of these neutron star ULXs shows huge swings in brightness, on a period of 38 days. The orbit of the neutron star and its companion is known to be only 2 days, so this is a super-orbital modulation, possibly caused by an extreme disk precession. https://t.co/Clfx9K9H41', 'We also found a new ULX, that appeared and disappeared during the year and a half. Maybe also a neutron star, but maybe something more exotic (red line shows the typical decline of a tidal disruption event...). Now looking for more of these in other Swift observations! https://t.co/7i1sa9j24O', '@AstroGnomie @NASASwift That wasn’t me :-) It is weird what’s happening with that source though!']",19,12,1125