0 Assigned ID: 2028 ----- Attempting Submission 1 (Fri Apr 09 17:06:02 GMT 2021) ----- FLASH level may be too low for this exposure or a short subexposure. See extended explanation in the diagnostic browser FLASH level may be too low for this exposure or a short subexposure. See extended explanation in the diagnostic browser Moved pointing center from UVIS-CENTER to UVIS1 to reduce CTE lossed as recommended by the CS. New visit in lieu of Visit 51 which also failed due to difficulty in guide star acquisition. Guide star acquisition could be affected by the presence of M81 on the North-Eastern side of the target. I've restricted the orient ranges from 110 to 170 to limit the coverage of M81 in the FGS fields. However, this substantially reduces the visit windows, so I would prefer to drop this constraint if it is not useful. Reduced filters to F606W in order to maximise the chance of getting a usable set of data. -495741506 ----- Attempting Submission 1 (Wed Jul 07 07:12:40 GMT 2021) ----- HST Phase II Proposal 16664 successfully submitted. Receipt: # 16664-1 ----- Attempting Submission 2 (Mon Sep 06 07:56:32 GMT 2021) ----- ----- Attempting Submission 3 (Mon May 02 11:07:21 GMT 2022) ----- ----- Attempting Submission 4 (Tue Nov 29 06:30:57 GMT 2022) ----- Not clear why the orbit planner and visit planner are giving errors. I have run them for visit 52 (the duplicate for visits 01 and 51 which failed). I have done "Run All Tools" but it doesn't remove this error message.) A repeating fast radio burst in a globular cluster at 3.6 Mpc The repeating fast radio burst (FRB) 20200120E has been localized with 100 mas precision using the European VLBI network to a globular cluster (GC) in the halo of M81, a spiral galaxy at a distance of 3.63 Mpc. The proximity of the source lends itself to detailed analysis of the FRB's environment as in the case of FRB 180916 (at a distance of 150 Mpc). GCs are known to be a hotbed of stellar interaction as proven by the presence of large populations of millisecond pulsars, low mass X-ray binaries and catacylsmic variables. However, the presence of FRB 20201020E in an low metallicity, old stellar population GC is surprising compared to the locations of most other FRBs near star forming regions and the theoretical expectations of FRBs originating from extremely active neutron stars that are typically found in such star forming regions. We request a short WFC3/UVIS observation of the GC to measure its stellar density profile, compactness, dynamic state (i.e. whether it has undergone core-collapse) and perform precise astrometry with respect to the radio reference frame to localize the FRB within the GC. We propose to observe the globular cluster [PR95] 30244 in the M81 system with HST to measure its size, position, radial profile, and stellar population. This will allow us to better understand the nature of the repeating FRB 20200120E. Here we have requested observations in F438W, F606W, and F814W filters using the WFSC3/UVIS camera with a 3-point dithering for adequately sampling the PSF. Dr. Shriharsh Tendulkar and Dr. Cees Bassa are radio and optical astronomers who have lead studies to understand the local environments of nearby FRBs for FRB 180916 and FRB 121102 using ground based and HST observations. Dr. Jason Hessels, Dr. Benito Marcote, Dr. Franz Kirsten, Dr. Shami Chatterjee, Prof. Victoria Kaspi, Prof. Emmanuel Fonseca, Prof. Kiyoshi Masui are experts in neutron stars, FRBs, and VLBI localization. Mr. Mohit Bhardwaj is a PhD student who is an expert in the follow up of low DM FRBs and understanding their host galaxies. Ms. Kenzie Nimmo is a PhD student who is an expert in ultra high-time resolution spectropolarimetric studies of FRBs. Dr. Paul Scholz has led multi-wavelength (X-ray and radio) studies of FRBs and persistent sources co-located with them. This team has spearheaded multiple campaigns for the studies of FRBs and their environments. PI Tendulkar and Co-Is Kaspi, Masui, Fonseca, Scholz, Bhardwaj are a part of the CHIME/FRB collaboration that originally detected and continues to observe FRB 20201020E. Co-Is Hessels, Kirsten, Marcote, Nimmo are a part of the EVN team that localized the FRB. Stellar Physics and Stellar Types 6 false false false false false false false SUPPORTED STELLAR CLUSTER GLOBULAR CLUSTER J2000 J2000 WFC3/UVIS Imaging No No F438W WFC3/UVIS Imaging No No F606W WFC3/UVIS Imaging No No F814W POS-TARG DITHER 0.135 LINE false false 3 46.84 WFC3-UVIS-DITHER-LINE-3PT 2 false POS-TARG DITHER 0.173 LINE 0.112 false false 81.785 4 23.884 WFC3-UVIS-DITHER-BOX 3 false The scheduling data was generated by CASM 29.2. CASM was run in Phase II mode. 1648883202000 135.5 (Tic-Visit :proposal-id 16664 :visit-id "01" :proposal-version -1 :trans-version "20210514" :date "06-Sep-2021 13:22:50.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 2598752 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 16664 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 16664 :visit-id "01" :orbit-number 1 :pcs-time 383 :si-vis-utilization 3103 :al-overhead-at-end 116 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3486 :pcs-gap 0 ) (Tic-Orbit :proposal-id 16664 :visit-id "01" :orbit-number 2 :pcs-time 392 :si-vis-utilization 3094 :al-overhead-at-end 122 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3486 :pcs-gap 0 ) false 2 0 The scheduling data was generated by CASM 30.1. CASM was run in Phase II mode. Duplicate for failed visit 01. 1668494608000 265.4 (Tic-Visit :proposal-id 16664 :visit-id "51" :proposal-version -1 :trans-version "20211222" :date "02-May-2022 16:19:18.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 2598752 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 16664 :visit-id "51" :obset-id "51" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 16664 :visit-id "51" :orbit-number 1 :pcs-time 393 :si-vis-utilization 3090 :al-overhead-at-end 116 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3486 :pcs-gap 0 ) (Tic-Orbit :proposal-id 16664 :visit-id "51" :orbit-number 2 :pcs-time 392 :si-vis-utilization 3093 :al-overhead-at-end 124 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3486 :pcs-gap 0 ) true 2 0 /private/var/folders/wl/clccxcsj0kg4xyhwrljnktcr0000gn/T/OPVisit10050702525628409203.xml The scheduling data was generated by CASM 30.3. CASM was run in Phase II mode. (Tic-Visit :proposal-id 16664 :visit-id "52" :proposal-version -1 :trans-version "20220630" :date "29-Nov-2022 11:58:53.0" :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 1154976 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 16664 :visit-id "52" :obset-id "52" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 16664 :visit-id "52" :orbit-number 1 :pcs-time 383 :si-vis-utilization 3100 :al-overhead-at-end 116 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3486 :pcs-gap 0 ) true 1 0