ZTF DR24 shows lower mean light at ZTF J0328−1219 relative to nearby stars in 2024–2025 than in 2018–2023

Public ZTF DR24 data show lower observed mean light at the known debris-transit white dwarf ZTF J0328−1219 in 2024–2025 than in 2018–2023. We use one instrument field and nine g or fourteen r comparison stars. After a same-exposure ensemble correction, the native magnitude changes are +0.0977 mag in g and +0.0916 mag in r. Equal weight is given to each observed night. Conditional 30-day block resampling gives 95% ranges of +0.0697 to +0.1253 mag and +0.0655 to +0.1138 mag. A fixed Pan-STARRS color correction gives changes of +0.0858 and +0.0873 mag. Each native comparison-star change is smaller than 0.009 mag in absolute value. The decrease remains with shorter baselines, phase checks, observing-condition cuts, and different comparison ensembles. An independent calculation reproduces the native means. This adds a checked brightness measurement beyond the ZTF data used in a 2024 study. The time windows were selected after inspection of raw annual medians. The result measures the sampled mean light. It does not separate a lower steady level from changing debris dips, identify a physical cause, or establish a new planet. The package preserves survey tables, query records, hashes, code, numeric results, figures, and offline reproduction instructions.

ZTF J0328-1219 · white dwarfs · planetary debris · ZTF DR24 · differential photometry · long-term variability · public data · reproducible research