Unsupported characters were found in Abstract and replaced with |*| Science Keywords: Select from 2 to 5 items. Science Keywords is a required field. Wavelength is a required field. Wavelength is a required field. 0 Assigned ID: 1626 ----- Attempting Submission 1 (Mon Dec 11 15:57:08 GMT 2017) ----- Joint XMM/HST This program follows the approval of XMM-Newton proposal 82368. We do not request strictly simultaneous observations, but would very much appreciate efforts to do so. Opportunities for scheduling simultaneous observations are present between 2018 December 3 and 2019 January 17. Comments are still valid (Jan 17)) 438172903 ----- Attempting Submission 1 (Wed Jan 17 16:24:29 GMT 2018) ----- We request an XMM-Newton and HST/STIS observation of GSN 069, an ultra-soft, unabsorbed, highly variable X-ray source optically classified as a Seyfert 2 AGN. Its high Eddington ratio (0.5) makes GSN 069 an exceptional high Eddington ratio 'true Seyfert 2 galaxy' candidate. The data so far suggest two possible interpretations: 1) a recent re-activation of the AGN after a period of low activity or quiescence or 2) an unusual (but not unique) long-lived outburst due to a Tidal Disruption Event (TDE). With our joint XMM/HST program we aim at clarifying the nature of this most exceptional source and derive constraints on the formation and evolution of BLR, disc winds, and AGN X-ray coronae in the first scenario, or on the nature of rare sustained TDEs in the second. We plan to perform spectroscopic observations of the Active Galactic Nucleus in the galaxy 6DFGS-GJ011908.7-341131 (a.k.a. GSN069) with the STIS-MAMA using the G230L spectral element in the NUV and the G140L one in the FUV. In both cases, we shall use the 52x0.5 aperture. Of the 3 HST orbits assigned to our program, we devote the first to the target acquisition (point-source) and to the G230L observation. The remaining 2 orbits are devoted to the G140L observations. With the HST observation, we will be able to search for high-ionization emission lines such as Civ and for low-ionization ones such as Mgii. The spectra will be used to look for weak broad components that may reveal the formation and evolution of the BLR and/or of an associated wind/outflow. The HST scheduling should ideally be coordinated with the approved XMM-Newton observation (XMM-Newton Obs.ID # 08236801, PI: G. Miniutti): we would like to observe the target with HST and with XMM-Newton as simultaneously as possible. We do not set a precise time range, as this is only a preferred scheduling, not a strict requirement. According to the HST Visit and Orbit planners and to the XMM-Newton visibility tool, opportunities do exist for simultaneous observations especially from 3 of December 2018 to 17 of January 2019. However, we stress again that simultaneous observations are preferred, not mandatory. Massive Black Holes And Their Host Galaxies 6 false false false false false false SUPPORTED GALAXY BLR NUCLEUS SEYFERT This object was generated by the targetselector and retrieved from the SIMBAD database. GSN069 J2000 J2000 STIS/FUV-MAMA Spectroscopic No No G140L STIS/NUV-MAMA Spectroscopic No No G230L /Users/miniutti/HSTphase2/OP-cache/gsn-v01.xml 1516204342855 The scheduling data was generated by CASM 25.2. CASM was run in Phase II mode. Visit comprising 3 orbits. The first orbit is for target acquisition and for 1 scientific exposure with G230L. The other two orbits are for two scientific exposures with G140L. (Tic-Visit :proposal-id 15442 :visit-id "01" :proposal-version -1 :trans-version "20171009" :date "17-Jan-2018 16:52:22.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 3 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 278864 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15442 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15442 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2907 :al-overhead-at-end 0 :internal-dur-at-end 113 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3240 :pcs-gap 0 ) (Tic-Orbit :proposal-id 15442 :visit-id "01" :orbit-number 2 :pcs-time 222 :si-vis-utilization 3018 :al-overhead-at-end 241 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3240 :pcs-gap 0 ) (Tic-Orbit :proposal-id 15442 :visit-id "01" :orbit-number 3 :pcs-time 222 :si-vis-utilization 3018 :al-overhead-at-end 241 :internal-dur-at-end 319 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3240 :pcs-gap 0 ) true 3 0