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The LIGO/Virgo gravitational wave events S190828j and S190828l were detectedonly 21 minutes apart, from nearby regions of sky, and with the same sourceclassifications (binary black hole mergers). It is therefore natural tospeculate that the two signals are actually strongly lensed images of the samemerger. However, an estimate of the separation of the (unknown) positions ofthe two events requires them to be >10 deg apart, much wider than thearcsecond-scale separations that usually arise in extragalactic lensing. Thelarge separation is much more consistent with two independent, unrelated eventsthat occurred close in time by chance. We quantify the overlap betweensimulated pairs of lensed events, and use frequentist hypothesis testing toreject S190828j/l as a lensed pair at 99.8% confidence.

The Two LIGO/Virgo Binary Black Hole Mergers on 2019 August 28 Were Not Strongly Lensed