RELATIVISTIC REVERBERATION HAS BEEN OBSERVED IN SEVERAL AGN WHERE DELAYS COMPARABLE TO THE LIGHT CROSSING TIME VERY CLOSE TO THE BLACK HOLE ARE SEEN BETWEEN THE FE K LINE AND THE CONTINUUM. IF THIS INTERPRETATION IS CORRECT OBJECTS WITH NO REFLECTION SHOULD SHOW NO RELATIVISTIC REVERBERATION. CONTINUUM LAGS HOWEVER ARE EXPECTED TO BE PRESENT REGARDLESS OF REFLECTION. THE LATTER HAVE BEEN ATTRIBUTED TO EITHER COMPTONIZATION PROPAGATING FLUCTUATIONS OR SCATTERING. HERE WE REQUEST A 120 KS OBSERVATION OF PG 1448+273 THAT SHOWS NO SIGNS OF REFLECTION TO DIRECTLY TEST THESE PREDICTIONS AND CONSTRAIN THE CONTINUUM LAGS. THE ABSENCE OF REFLECTION WILL ALLOW US TO ISOLATE THE CONTINUUM LAGS AND UNDERSTAND THEIR ORIGIN PROVIDING UNPRECEDENTED CONSTRAINTS ON THE X-RAY SOURCE AND THE REFLECTOR.

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