087084

After a 10-year break Mrk 590 is rekindling its nuclear activity with a rise in X-ray flux! We wish to seize this rare opportunity to record for the first time the onset of AGN activity as it occurs since this can lead to significant insight on the long-standing issue of how AGNs are triggered and fueled. We ask to trigger up to 3 single-visit joint NuSTAR/Swift/XMM observations to determine if a standard thin accretion disk is being built up as the AGN turns on or if alternate physics are at play. Relatively inexpensive XMM exposures are needed to constrain any intrinsic absorption. The data are also ideal for testing the recent prediction that quasi-periodic eruptions can explain the flux changes seen for Mrk 590. [truncated! Please see actual data for full text]