The majority of broad absorption line quasars are X-ray weak which is usually explained by the absorption of the out-flowing wind in combination with the winds velocity shear. PG 0043+039 is the most extreme X-ray weak quasar known to date, but shows surprisingly only a very weak broad absorption line system. A conclusive interpretation is hampered by the absence of simultaneous measurements which is mandatory as both, the X-ray flux and the broad absorption system are known to be variable. We propose simultaneous XMM-Newton, HST (1 orbit) and 10m Hobby-Eberly or SALT Telescope observations in order to characterize simultaneously PG 0043-036|*|s X-ray emission and (broad) absorption (line system) properties. The UV spectrum of this quasar should be taken simultaneously with XMM observations. A UV spectrum of this variable quasar has been taken before with HST-FOS-G190H in 1991 (Turnshek et al., ApJ 476,40 (1997)). The target coordinates are taken from "The large quasar reference frame (LQRF). An optical representation of the ICRS" Andrei, A. H., Souchay, J., Zacharias, N., et al., A&A 505,385 (2009). 12 false false 0.0 0.0 false false false SUPPORTED GALAXY QSO J2000 J2000 COS/FUV Spectroscopic No No G140L The scheduling data was generated by CASM 20.2. CASM was run in Phase II mode. HST observations should be done simultaneously with XMM observations. (Tic-Visit :proposal-id 12952 :visit-id "01" :proposal-version -1 :trans-version "20120615" :date "19-Nov-2012 14:58:02.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "31" :si-bright-earth-limb-angle 20.0 :data-volume 52416 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12952 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 12952 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2643 :al-overhead-at-end 0 :internal-dur-at-end 366 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3015 :pcs-gap 0 ) true 1 0