We describe our studies of the radio and high-energy properties of Rotating Radio Transients ( RRATs ) .
We find that the radio pulse intensity distributions are log-normal , with power-law tails evident in two cases .
For the three RRATs with coverage over a wide range of frequency , the mean spectral index is -1.7 \pm 0.1 , roughly in the range of normal pulsars .
We do not observe anomalous magnetar-like spectra for any RRATs .
Our 94-ks XMM-Newton observation of the high magnetic field RRAT J1819 - 1458 reveals a blackbody spectrum ( kT \sim 130 eV ) with an unusual absorption feature at \sim 1 keV .
We find no evidence for X-ray bursts or other X-ray variability .
We performed a correlation analysis of the X-ray photons with radio pulses detected in concurrent observations with the Green Bank , Effelsberg , and Parkes telescopes .
We find no evidence for any correlations between radio pulse emission and X-ray photons , perhaps suggesting that sporadicity is not due to variations in magnetospheric particle density but to changes in beaming or coherence .