Real-time human-readable alert summary sent by the SAGUARO TOM, as viewed on the Slack mobile app. The message time stamp shows that the first alert arrived within ∼1 minute of the detection. The summary contains helpful information for determining whether follow-up is appropriate, including the inverse of the false-alarm rate (1/FAR), the distance to the source, the areas of the 50% and 90% localization regions, and, for compact binary coalescences, the probabilities of the progenitor system containing at least one object with mass <3 M _☉ (Has NS) or 3–5 M _☉ (Has Mass Gap), the event having an EM counterpart (Has Remnant), and the signal coming from a BNS merger, NSBH merger, BBH merger, or terrestrial noise source. More information is easily accessed by following the hyperlinks at the bottom of the summary.