NICER observation list: Target ID 468901

Fast radio bursts (FRBs) are extragalactic pulses of radio emission, whose progenitor population is still unknown. Thus far, 22 extragalactic FRB sources have been found to produce repeat bursts. We propose to carry out a high time resolution search for X-ray bursts from 5 active repeating FRB sources with low dispersion measures in the soft X-ray band using NICER. We propose for a total of 150 ks of ToO observations with NICER, which will be coordinated with simultaneous radio observations with the Deep Space Network 70-m radio telescopes as part of an on-going FRB monitoring program. Each of our repeating FRB targets will be observed for a total of 30 ks using NICER, and we will trigger the observations when these repeating FRB sources become active in the radio band.