0 Assigned ID: 1207 ----- Attempting Submission 1 (Fri Jan 17 12:09:46 GMT 2020) ----- ----- Attempting Submission 2 (Sat Jan 18 04:42:25 GMT 2020) ----- Please find the revised phase II proposal for 16076, please could this be observed towards the early part of the avaliable time window as this is an unknown transient source and we do not know for how long this source will be bright. Please contact me if there are any problems. Thank you. 269831214 ----- Attempting Submission 1 (Thu Mar 19 22:09:09 GMT 2020) ----- HST Phase II Proposal 16076 successfully submitted. Receipt: # 16076-1 ----- Attempting Submission 2 (Mon Mar 23 19:38:38 GMT 2020) ----- HST Phase II Proposal 16076 successfully submitted. Receipt: # 16076-2 ----- Attempting Submission 3 (Mon Apr 06 21:01:27 GMT 2020) ----- UV spectroscopy and imaging of the transient Swift J221951-484240 discovered in the follow-up of GW S190930t. Swift/UVOT detected J221951-484240 on the 30th September 2019 as part of the search for an electromagnetic counterpart to the LIGO/VIRGO Gravitational Wave (GW) trigger S190930t; after the cycle 27 proposal deadline. Compared to archival UV images, J221951-484240 is brighter by over 3 magntidues. The nature of this blue-slowly evolving source remains unclear following Swift and ground-based follow-up. It is possible this transient is associated with S190930t or alternatively it may be a new class of UV-bright transient. HST UV data is the only means to constrain the distance to the source and its true nature. Determining this now will allow us to plan additional observations using Swift, HST and other resources to follow its evolution. Observations in the present cycle would also facilitate rapid publication, which is of particular importance as this source was identified during follow-up of a GW alert. Only HST has the UV spectroscopic capability to obtain the key data needed to identify the nature of this 19th magnitude u-band transient before it fades away. Owing to the unique nature of this source, these observations will lead to a timely and high-impact publication whether or not it is connected to the GW emission. UV spectroscopy and imaging of the transient Swift J221951-484240 with COS and ACS The leading proposers have published on eruptive and transient sources, including GRB, SNe, novae, TDEs. They are part of the EM follow up of gravitational wave detections by the LIGO-Virgo groups. Their expertise is mainly observational, but in the larger collaboration theoretical experts are included. In addition we have in our collaboration two AGN experts. Stellar Physics Massive Black Holes And Their Host Galaxies 3 false false true false false false false AVAILABLE UNIDENTIFIED INFRARED EMITTER OPTICAL EMITTER ULTRAVIOLET EMITTER UNDESIGNATED NO J2000 J2000 UNIDENTIFIED BLANK FIELD NO This target is a blank piece of sky which is the bright object safe pointing and is 9.839 arcseconds away at a PA of 271.4 degrees U3. J2000 COS/FUV Spectroscopic No No G140L 1105 COS/FUV Spectroscopic No No G140L 1280 ACS/WFC Imaging No No CLEAR2L POS-TARG DITHER 0.262 LINE 0.192 false false 68.14 4 18.39 ACS-WFC-DITHER-BOX 1 false Timing link suitability includes constraints ([03 After 04 by at least 3.0 days]) The scheduling data was generated by CASM 28.0. CASM was run in Phase II mode. /private/var/folders/83/0nnf3bqd2yg46q83dfbbn2wc00023n/T/OPVisit15010899806767561475.xml This visit should be scheduled in the evening local time. Flags need to be cleared during the workday. (Tic-Visit :proposal-id 16076 :visit-id "03" :proposal-version -1 :trans-version "20191203" :date "15-Apr-2020 17:04:29.0" :trans-errors '(:WARNINGS 1 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 3 :saa-model "31" :si-bright-earth-limb-angle 20.0 :data-volume 69936 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 16076 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 16076 :visit-id "03" :orbit-number 1 :pcs-time 393 :si-vis-utilization 2889 :al-overhead-at-end 0 :internal-dur-at-end 38 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3285 :pcs-gap 0 ) (Tic-Orbit :proposal-id 16076 :visit-id "03" :orbit-number 2 :pcs-time 302 :si-vis-utilization 2980 :al-overhead-at-end 0 :internal-dur-at-end 38 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3285 :pcs-gap 0 ) (Tic-Orbit :proposal-id 16076 :visit-id "03" :orbit-number 3 :pcs-time 302 :si-vis-utilization 2983 :al-overhead-at-end 0 :internal-dur-at-end 331 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3285 :pcs-gap 0 ) false 3 1 This visit is for BOP checking the safe target only and should not execute onboard HST. (Tic-Visit :proposal-id 16076 :visit-id "03" :proposal-version -1 :trans-version "20191203" :date "06-Apr-2020 21:57:23.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 3 :saa-model "31" :si-bright-earth-limb-angle 20.0 :data-volume 69936 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 16076 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 16076 :visit-id "03" :orbit-number 1 :pcs-time 393 :si-vis-utilization 2889 :al-overhead-at-end 0 :internal-dur-at-end 38 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3285 :pcs-gap 0 ) (Tic-Orbit :proposal-id 16076 :visit-id "03" :orbit-number 2 :pcs-time 302 :si-vis-utilization 2980 :al-overhead-at-end 0 :internal-dur-at-end 38 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3285 :pcs-gap 0 ) (Tic-Orbit :proposal-id 16076 :visit-id "03" :orbit-number 3 :pcs-time 302 :si-vis-utilization 2983 :al-overhead-at-end 0 :internal-dur-at-end 331 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3285 :pcs-gap 0 ) false 3 0 The scheduling data was generated by CASM 28.0. CASM was run in Phase II mode. (Tic-Visit :proposal-id 16076 :visit-id "02" :proposal-version -1 :trans-version "20191203" :date "06-Apr-2020 21:44:17.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 1136896 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 16076 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 16076 :visit-id "02" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2950 :al-overhead-at-end 0 :internal-dur-at-end 347 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3285 :pcs-gap 0 ) false 1 0 /private/var/folders/83/0nnf3bqd2yg46q83dfbbn2wc00023n/T/OPVisit18315370317753101058.xml Timing link suitability includes constraints ([03 After 04 by at least 3.0 days]) The scheduling data was generated by CASM 28.0. CASM was run in Phase II mode. This visit allocates and sets up the safe position offset slot for visit 03 which will use that slot. This S/C visit should go earlier in the week while visit 03 will be at least 3 days later. (Tic-Visit :proposal-id 16076 :visit-id "04" :proposal-version -1 :trans-version "20191203" :date "15-Apr-2020 17:04:30.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "11" :si-bright-earth-limb-angle 20.0 :data-volume 0 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 16076 :visit-id "04" :obset-id "04" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 16076 :visit-id "04" :orbit-number 1 :pcs-time 333 :si-vis-utilization 5 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3285 :pcs-gap 0 ) true 1 0