2018ApJ...866..152S

Rotating radio transients (RRATs) are a sub-class of pulsars characterized by sporadic emission and thus can generally only be studied by analysis of their single pulses. Here we present a single-pulse analysis using 11 years of timing data at 1400 MHz of three RRATs, PSRs J1819-1458, J1317-5759, and J1913+1330. We perform a spectral analysis on the single pulses of these RRATs for the first time, finding their mean spectral indices to be -1.1 ± 0.1, -0.6 ± 0.1, and -1.2 ± 0.2 respectively, within the known range of pulsar spectral indices. We find no evidence for narrowband features as seen for FRB 121102. However, we find the spread of single-pulse spectral indices for these RRATs (ranging from -7 to +4) to be larger than has been seen in other pulsars, with the exception of the Crab pulsar. We also analyze the time between detected pulses, or wait time, and find that the pulses are not random and cluster around wait times of a few pulse periods as well as ∼25 pulse periods for PSRs J1819-1458 and J1317-5759. Additionally we find that there is no correlation between the wait time and pulse flux density. Finally we find that the distribution of the pulse energy for PSRs J1317-5759 and J1913+1330 are log-normal, while that of PSR J1819-1458 is log-normal with possible evidence of an additional power-law component.