ZTF r data reject sustained 200-day dips of at least 0.5 mag in Gaia21bcv within the 2021–2025 test interval under the stated error rule

We test later public measurements of Gaia21bcv after its known 2019–2021 dim episode. ZTF DR24 gives 118 selected r nights from 4 November 2021 to 10 April 2025. We use one field and the first accepted exposure per integer UTC MJD day. The old bright reference is r = 17.81729 mag. The faintest later point is only 0.18842 mag below this level. All 118 nights pass a bright-state rule with five assigned errors and a 0.03 mag floor for each measurement and the reference. This rule is an explicit error margin, not a false-alarm probability. Exact interval unions show that every sustained 200-day dip of at least 0.5 mag fully inside the tested dates conflicts with at least two bright nights. The largest gap is 188.31 days. Two-night coverage rejects only 55.86% of uniform start times for 30-day dips and 75.41% for 90-day dips. A second test assumes flat dim cores that repeat at the old deep times. Its period bounds change with the assumed core width. These results do not exclude all irregular repeats or establish an orbit, companion mass, or planet. We supply frozen public data, source records, code, exact intervals, figures, and independent numerical checks.

Gaia21bcv · ZTF DR24 · stellar dimming · occultation · dust · time coverage · repeat test · public data