Urgent, most near-by SNeIa in HST lifetime -432679183 Assigned ID: 2224 ----- Attempting Submission 1 (Wed Jan 22 11:18:18 GMT 2014) ----- 0 ----- Attempting Submission 1 (Fri Jan 24 17:01:44 GMT 2014) ----- The closest reddened Type Ia supernova in the HST life time The Type Ia supernova just discovered in M82 offers the best chance within our blifetime to resolve one of the outstanding questions of the astrophysics of the interstellar medium and the use of Type Ia SNe for cosmology. We have a unique opportunity to both explore the SNIa progenitor scenario, the circumstellar environment, and dust along the line of sight. HST multi-epoch in UV spectroscopy and photometry, as well as spectroscopy of SNe with a range in optical colors, is needed to break the degeneracy for the scenarios that have been considered here. If evidence for CS material is detected, the multi-wavelength data-set will yield a good estimate of the range in CS shell radii, widths and dust content needed to understand and model the color-brightness relation to get accurate cosmological distances to SN~Ia. 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(Tic-Visit :proposal-id 13621 :visit-id "02" :proposal-version -1 :trans-version "20131031" :date "24-Jan-2014 17:55:43.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 338672 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13621 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13621 :visit-id "02" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2671 :al-overhead-at-end 76 :internal-dur-at-end 407 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3057 :pcs-gap 0 ) false 1 0 Timing link suitability includes constraints ([03 After 01 by 7.0 to 8.0 days]) The scheduling data was generated by CASM 21.2. CASM was run in Phase II mode. 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