0 Assigned ID: 4939 ----- Attempting Submission 1 (Thu Nov 16 04:41:20 GMT 2023) ----- HST Phase I Proposal 4939 successfully submitted. Receipt: # 4939-1 ----- Attempting Submission 2 (Thu Nov 16 04:47:46 GMT 2023) ----- HST Phase I Proposal 4939 successfully submitted. Receipt: # 4939-2 I've updated the IR exposure times to be suitable for the 1-gyro mode. -262403718 ----- Attempting Submission 1 (Tue Feb 20 21:52:09 GMT 2024) ----- HST Phase II Proposal 17606 successfully submitted. Receipt: # 17606-1 ----- Attempting Submission 2 (Sat Mar 16 19:32:41 GMT 2024) ----- ----- Attempting Submission 3 (Wed Jun 12 18:18:18 GMT 2024) ----- Meet Me In the Afterglow: Late-time follow up of the Ultra-luminous GRB 221009A We propose to acquire deep multi-band HST observations of the most energetic GRB ever observed, GRB 221009A. The subsequent afterglow was also superlatively bright in the radio, optical, and X-ray bands. Late-time HST photometry has revealed slower fading in the optical than the near-IR, inconsistent with expectations for a GRB afterglow. Here we propose late-time HST observations at ~600-722 days after explosion to continue monitoring the evolution of this unprecedented event at optical-NIR wavelengths. The goals of this program are to constrain the timing of the jet break, better model the host galaxy, and investigate the local environment. HST mid-cycle 31 observations are essential for this remarkable object as it will fade by the time of Cycle 32. In this proposal, we have 12 orbits split across 4 visits. The visits can happen in any order, however we would like visit 1 and 2 to happen within two weeks of eachother and visits 2, 3, and 4 to happen within two weeks of eachother. The goal of this project is to add three additional points to the light curve of the fading GRB afterglow. Visit 1 (3 orbits): 3 orbits with UVIS/F814W. Visit 2 (3 orbits): 1 orbit with UVIS/F814W and 2 orbits with IR/F110W and IR/F160W. The IR orbits have ~800s in F160W and ~1600s in F110W. Visit 3 (3 orbits): 3 orbits with IR/F110W and IR/F160W. Each orbit has ~800s in F160W and ~1600s in F110W. Visit 4 (3 orbits): 3 orbits with IR/F110W and IR/F160W. Each orbit has ~800s in F160W and ~1600s in F110W. Ms. Sears led the reduction of the Cycle 30 HST observations of this event and is experienced in modeling GRB host galaxies with GALFIT. Prof. Chornock is an expert in optical and NIR observations of astronomical transients, including GRBs. Profs. Margutti and Berger are experts in modeling the multiwavelength emission from GRB afterglows. Profs. Alexander and Laskar led radio and millimeter followup observations of this event. Dr. Blanchard and Prof. Milisavljevic are experts on the analysis of HST images. Prof. Villar is an expert in modeling emission from astronomical transients using the MOSFiT code. Ms. LeBaron and Mr. Jacobson-Galan are graduate students working with Profs. Margutti and Chornock and will be trained in the analysis of the data. Stellar Physics and Stellar Types Galaxies 3 false false false false false true false false SUPPORTED EXT-STAR GAMMA RAY BURSTER J2000 J2000 fading WFC3/IR Imaging No No F110W WFC3/UVIS Imaging No No F814W WFC3/IR Imaging No No F160W /private/var/folders/m4/hwn7_vg12450d_bmtvf36ys80000gn/T/OPVisit8078659533667894140.xml Timing link suitability includes constraints ([Sequence (01 02) within 14.0 days]) The scheduling data was generated by CASM 32.1. CASM was run in Phase II mode. 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CASM was run in Phase II mode. 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CASM was run in Phase II mode. 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