Please find attached our mid-cycle proposal for observations of GRB 190829A. -1525936348 Assigned ID: 1155 ----- Attempting Submission 1 (Fri Sep 27 21:48:07 GMT 2019) ----- Please find attached our submission of GO16320 which contains the final bservations of GRB190829A at late times. Please let us know in case of any questions. Best Wishes, Andrew changed to a sequence 01-03, and added FGS3 on visits 01-03 changed the aperture on visit 03, exp. 2 to UVIS1 (instead of UVIS 2) added a timing window to visit 03, and slightly altered those for visits 01 and 02. 1836150180 ----- Attempting Submission 1 (Fri Dec 06 07:32:23 GMT 2019) ----- ----- Attempting Submission 2 (Fri Dec 06 15:13:38 GMT 2019) ----- ----- Attempting Submission 3 (Tue Dec 17 14:31:59 GMT 2019) ----- ----- Attempting Submission 4 (Thu Jan 23 21:32:03 GMT 2020) ----- ----- Attempting Submission 5 (Tue Jun 30 13:22:48 GMT 2020) ----- Do collapsars make the heavy elements: A sensitive search in a nearby gamma-ray burst? The origin of half of the elements heavier than iron -- the so-called r-process elements -- is a central unsolved mystery in astrophysics. These atoms include both precious metals (e.g. gold) as well as radioactive elements required for geophysical processes on the Earth (e.g. thorium) and even some which are necessary on Earth for advanced life (e.g. iodine). Recent observations with both light and gravitational waves have demonstrated that at least some of these elements are formed through the merger of two neutron stars, but such a population struggles to reproduce the enrichment patterns seen in stars within the Milky Way as well apparent early enrichment in some dwarf galaxies. Instead, recent work implies that the accretion disks formed in the stellar collapse that powers a long duration gamma-ray burst could in-fact be a dominant site. If this is true we should be able to observe r-process synthesis in the associated supernovae. The presence of lanthanides in r-process material creates strong opacity, such that the signature of their synthesis should be a late time infrared component visible in the supernova light. Here we propose sensitive HST observations that will search for both spectroscopic and photometric evidence of the r-process, providing the opportunity to test, for the first time, if collapsars are responsible for heavy element production. This is a submission for the final 5 oribits of our programme. The aim is to obtain template images and spectroscopy to subtract from our earlier data. Therefore we have set a stringent roll constraint on the spectroscopic observations so that they match the observations obtained in fall 2019. Otherwise these are a repeat of observations already taken under the for-runner of this programme. The team submitting this proposal has a great deal of expertise in studies of the transient Universe. The PI has led a total of 32 successful HST proposals that address the nature of gamma-ray bursts, supernovae, tidal disruption events and gravitational wave sources. These proposals have led to a large number of refereed papers reporting the observations. The CoIs also include experts on studies of supernovae and gamma-ray bursts, many of whom have significant HST experience. We also maintain a large scale follow-up operations with ground based facilities (in particular the VLT), and will supplement the data obtained here with ground based observations when the source is sufficiently bright. However, the observations that we propose are impractical from the ground. In addition to the previous expertise, we also have the currently available resources (individual time, postdoctoral support etc) to enable the timely analysis and publication of the observations obtained here. 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