The frequency dependence of radio pulse arrival times provides a probe of structures in the intervening media . \citet Demorest+2013 was the first to show a short-term ( \sim 100-200 days ) reduction in the electron content along the line of sight to PSR J1713+0747 in data from 2008 ( approximately MJD 54750 ) based on an apparent dip in the dispersion measure of the pulsar . We report on a similar event in 2016 ( approximately MJD 57510 ) , with average residual pulse-arrival times \approx -3.0 , -1.3 , and -0.7 ~ { } \mu \mathrm { s } at 820 , 1400 , and 2300 MHz , respectively . Timing analyses indicate possible departures from the standard \nu ^ { -2 } dispersive-delay dependence . We discuss and rule out a wide variety of potential interpretations . We find the likeliest scenario to be lensing of the radio emission by some structure in the interstellar medium , which causes multiple frequency-dependent pulse arrival-time delays .