Monitoring of the extreme alpha_ox variations in the luminous NL QSO PHL 1092

During a 2008 XMMNewton observation the luminous NarrowLine quasar PHL 1092showed a dramatic Xray flux drop by a factor virgul200 with respect to previousXray observations, becoming one of the most extreme Xray weak QSO (alpha_ox 2.44), after being Xray normal (alpha_ox 1.56) only 4.5 years earlier.The aim of this proposal is to continue our UV and Xray monitoring of thisextreme source with two 25 ks exposures (one for each visibility window, henceseparated by about 6 months) to unveil the timescale over which transitions fromXray weak to normal QSO states take place in this most extraordinary AGN. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]