NICER observation list: Target ID 563302

The fast radio bursts (FRBs) are milli-second duration radio transients, the origin of which is still unknown. Possible mechanisms that could generate these highly coherent radio emission from FRBs involve a) neutron star magnetospheres and/or b) relativistic shocks far from the central energy of the source. Polarization signatures in radio band can distinguish between the two scenarios. Detection of emission in X-rays (with a measure/limits on the efficiency $\eta ~E_{Radio}/E_{X-ray}$) are therefore crucial to establish/confirm if indeed the emission mechanisms are the same as those predicted by radio polarization angle measurements. We propose to observe the sources FRB~180301 and FRB~121102 each with a total exposure of $\sim 50\ks$ with NICER+FAST during their bursting-phases.