coordinate system changed to ICRS ----- Submission 1 (Sat May 13 00:19:42 GMT 2006) ----- Phase II Proposal 10892 (echophaseii) successfully submitted. ----- Submission 2 (Mon May 15 23:52:24 GMT 2006) ----- Assigned ID: 402 ----- Submission 1 (Fri Jan 27 20:43:40 GMT 2006) ----- Phase I Proposal 402 (echo) successfully submitted. ----- Submission 2 (Fri Jan 27 23:50:27 GMT 2006) ----- Phase I Proposal 402 (echo) successfully submitted. Light echos are excellent probes of circumstellar and interstellar dust. We have been using the unique power of light echos to study the progenitors of type Ia supernovae, but currently, only two distant echos are known: SN 1991T and 1998bu. Both events show dust close to the progenitors and the echo light curve suggests that the dust actually surrounds SN 1991T. Here we propose to use HST to confirm a third echo and study its size, brightness and color.

We propose to observe the site of the supernova sn1995E in ngc 2441 with HST/ACS to determine is the source discoverd in eariler snap images is a light echo. 1 orbit F435W 1 orbit F555W ISM IN EXTERNAL GALAXIES 12 false 0.0 false false false false false SUPPORTED EXT-STAR SUPERNOVA TYPE IA J2000 07 51 56.5400 +73 00 35.10 J2000 ACS/WFC Imaging No No F555W ACS/WFC Imaging No No F435W POS-TARG DITHER 0.265 LINE 0.187 false false 69.05 4 20.67 ACS-WFC-DITHER-BOX 1 false /var/tmp/OPVisit3193.xml 1147736641936 (Tic-Visit :proposal-id 10892 :visit-id "01" :proposal-version -1 :trans-version "20060322" :date "15-May-2006 19:43:58.0" :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 10892 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 10892 :visit-id "01" :orbit-number 1 :pcs-time 355 :si-vis-utilization 2926 :al-overhead-at-end 0 :internal-dur-at-end 349 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3321 :pcs-gap 0 ) true 1 0 /var/tmp/OPVisit11831.xml 1147478586894 /var/tmp/OPVisit3194.xml 1147736659618 (Tic-Visit :proposal-id 10892 :visit-id "02" :proposal-version -1 :trans-version "20060322" :date "15-May-2006 19:44:17.0" :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 10892 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 10892 :visit-id "02" :orbit-number 1 :pcs-time 355 :si-vis-utilization 2926 :al-overhead-at-end 0 :internal-dur-at-end 349 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3321 :pcs-gap 0 ) true 1 0 /var/tmp/OPVisit11832.xml 1147478611927