RECENT DATA HAVE LED TO A BREAKTHROUGH IN AGN STUDIES THROUGH THE DETECTION OF RELATIVISTIC REVERBERATION. THESE ECHOES ARE CAUSED BY THE DELAYED RESPONSE OF THE REFLECTED EMISSION TO A PRIMARY ILLUMINATING SOURCE PROVIDING A POWERFUL TOOL TO PROBE REGIONS CLOSE TO THE BLACK HOLE IN AN UNPRECEDENTED MANNER. THE PROPERTIES OF THE ECHOES ARE CONSTANT ON DAYS TIMESCALE BUT CHANGE OVER THE YEARS. THE CHARACTERISTIC TIMESCALE OF THE CHANGE WHICH WOULD SUGGEST A GEOMETRY CHANGE IS UNKNOWN. HERE WE PROPOSE TO OBSERVE SW J2127.4 FOR 350 KS TO ADDRESS THIS QUESTION. WITH SEVERAL EXPOSURES SEPARATED BY WEEKS TO MONTHS WE WILL CONSTRAIN THIS CHARACTERISTIC TIMESCALE AND PROBE CHANGES IN THE GEOMETRY OF THE SYSTEM PROVIDING UNPRECEDENTED DETAILS ABOUT THE DISK-CORONA AT THE HORIZON SCALES.

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