Constraining the only significant AGN QPO

Black hole binaries show high frequency QPOs. These are not well understood buttheir short timescales imply they must be produced close to the event horizon.Our recent discovery of the first significant AGN QPO gives a unique opportunityto study these in much more detail than is possible in BHB from the sloweddown. AGN QPO lightcurve. A single reobservation of the QPO would show thatthis is indeed a characteristic feature of this superEddington source, but theQPO is transient, not present in a followup snapshot. We propose 7 snapshots of50ks each (the maximum possible in this AO and the minimum required for a 3sigma detection) to redetect the QPO and study its properties. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]