Due to an error at the publisher, in the published article the number of pulsars presented in the paper is incorrect in multiple places throughout the text. Specifically, "222" pulsars should be "221." Additionally, the number of pulsars for which we have EM observations that fully overlap with O1 and O2 changes from "168" to "167." Elsewhere, in the machine-readable table of Table 1 and in Table 2, the row corresponding to pulsar J0952-0607 should be excised as well. Finally, in the caption for Table 2 the number of pulsars changes from "188" to "187." IOP Publishing sincerely regrets this error.
B. P. Abbott et al., "Erratum: Searches for Gravitational Waves from Known Pulsars at Two Harmonics in 2015-2017 LIGO Data (Astrophysical Journal (2019) 879 (10) DOI: 10.3847/1538-4357/Ab20cb)," Astrophysical Journal, vol. 882, no. 1, Institute of Physics - IOP Publishing, Sep 2019.
The definitive version is available at https://doi.org/10.3847/1538-4357/ab3231
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01 Sep 2019