Overview

• The Arecibo Wow! team posted a preprint and submitted it to The Astrophysical Journal on August 14 after reprocessing the 1977 detection alongside decades of preserved SETI records.
• Revised measurements put the signal at 1420.726 MHz near the hydrogen line and at roughly 250 Janskys in flux density, exceeding many previous estimates.
• The team reports a much tighter sky region for the event with about a two‑thirds increase in location certainty compared with earlier assessments.
• Key fixes include a 21‑second clock offset and a mislabeled filter‑bank channel that materially affected the recalculated frequency and related inferences about the source’s motion.
• Known terrestrial explanations, nearby satellites, lunar reflections, and a software glitch are deemed unlikely, which supports a natural origin such as a neutral hydrogen cloud possibly excited by a transient source, though the mystery remains unresolved and further archival releases are planned over the next two years.