NICER observation list: Target ID 257302

Reverberation light echoes from optical up to hard X-rays map out the accretion flows of AGN from the broad line region down (BLR) to the innermost stable circular orbit (ISCO) of the black hole. Swift measures X-ray/UV/optical time lags that map out the accretion disc, which appear to suggest a departure from the standard picture of a compact X-ray corona irradiating a thin disc. This is in tension with X-ray reverberation mapping results, which prefer a compact corona within 10 gravitational radii irradiating a disc that extends down to or near the ISCO. To resolve this tension, we have requested a 100-day multi-wavelength reverberation mapping campaign with Swift and Las Cumbres Observatory (3x per day; Swift proposal pending), accompanied by 4 days of observations by XMM- Newton and Nu