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Spiewak, S. Chatterjee, S. J. Vigeland, S. M. Ransom, T. Dolch, T. J. W. Lazio, T. T. Pennucci, V. Gupta, W. W. Zhu, Z. Arzoumanian","submitted_at":"2017-12-11T06:07:43Z","abstract_excerpt":"The frequency dependence of radio pulse arrival times provides a probe of structures in the intervening media. Demorest et al. 2013 was the first to show a short-term (~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 of approximately 3.0,-1.3, and -0.7 microseconds at 820, 1400, and 2300 MHz, respectively. 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