16505

The origin of the Fast Radio Bursts (FRBs) has become one of the central questions in contemporary astrophysics. Several lines of evidence have pointed to their association with some form of magnetar flare comma occurring in external galaxies. However comma this is by no means a unique explanation comma with other viable models also suggested. A significant step forward in this field occurred with the apparent detection of a millisecond radio burst (essentially an FRB) from the Galactic magnetar SGR 1935+2154. This magnetar is one of the most active known and continues to undergo an unprecedented period of activity with an intensive ongoing campaign. Fortuitously comma HST has previously observed the magnetar comma locating an IR counterpart. Here we request a single orbit observation that will detect it in its current active state. This observation will enable us to test how the optical-IR emission appears after the FRB providing vital insight to other searches for optical-IR counterparts of FRBs in external galaxies. Furthermore comma as the source is currently active and sufficiently bright for detection comma a proper motion measurement with a 6-year baseline will be possible. The proper motion will enable the magnetar to be tracked back to its birth-site comma testing its assocaition with a supernova remnant comma as well as providing a route for comparing its velocity with that of the general pulsar population.