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X-ray reverberation mapping has emerged as a new tool to probe accretion inAGN, providing a potentially powerful probe of accretion at the black holescale. The lags, along with relativistic spectral signatures are ofteninterpreted in light of the lamp-post model. Focusing specifically on testingthe prediction of the relativistic reverberation model, we have targetedseveral of the brightest Seyfert Galaxies in X-rays with different observingprograms. Here, we report the results from two large campaigns with NuSATRtargeting MCG-5-23-16 and SWIFT J2127.4+5654 to test the model predictions inthe 3-50 keV band. These are two of three sources that showed indications of adelayed Compton hump in early data. With triple the previously analyzedexposures, we find no evidence for relativistic reverberation in MCG-5-23-16,and the energy-dependent lags are consistent with a log-linear continuum. InSWIFT J2127.4+5654, although a continuum-only model explains the data, therelativistic reverberation model provides a significant improvement to theenergy and frequency-dependent lags, but with parameters that are notconsistent with the time-averaged spectrum. This adds to mounting evidenceshowing that the lag data is not consistent with a static lamp-post model.

A Hard Look At Relativistic Reverberation in MCG-5-23-16 & SWIFT J2127.4+5654: Testing the Lamp-Post Model