Effects of Localization Precision on Identified Fast Radio Burst Host Galaxy Magnitudes

Abstract We study the potential bias in the identification of fast radio burst (FRB) host galaxies due to radio localization uncertainty. Using a sample of FRBs localised to typically by the Australian Square Kilometre Array Pathfinder, we artificially increase the localization uncertainty up to 10″, and re-run the Probabalistic Association of Transients to their Hosts algorithm to determine the most likely host galaxy. We do not find evidence of a significant change in identified hosts until the localization precision is worsened to 2″ or greater.