Single lens least squares fits at Γ = 0.4 give source radius crossing times of 21.12 and 23.07 hours in two reductions of 256 shared KMT-2025-BLG-3184 I-band exposures

We test the source radius crossing time of the known microlensing event KMT-2025-BLG-3184 with public pySIS and DIAPL data. At the fixed limb coefficient Γ = 0.4, a single lens model gives 21.12 hours for 256 selected pySIS field-41 I-band rows and 21.51 hours for 279 selected DIAPL rows. A time match identifies 256 shared exposures. On that set, DIAPL gives 23.07 hours, while pySIS stays at 21.12 hours. One extra DIAPL point accounts for 79.05 percent of its full finite source residual sum. Large residuals remain on the shared set. An added soft-L1 fit gives 21.10 hours for pySIS and 24.39 hours for DIAPL. Time window tests move DIAPL from 20.03 to 28.15 hours. The close full-data values therefore do not establish a stable crossing time across the two reductions. The finite source model has a smaller residual sum than the point source model in the main and shared tests. These scores have no planet detection probability meaning. The reductions use many of the same images. They are not independent astronomical observations. Forty-five V-band rows have too little peak coverage to resolve the shape choice. We reproduce the prior six-stream pySIS result and provide all 15 numerical source files, paired row records, source code, figures, and offline reproduction instructions. We do not determine a lens mass or confirm a planet.

KMT-2025-BLG-3184 · microlensing · finite source · source radius crossing time · KMTNet · pySIS · DIAPL · shared exposures · photometric errors · reproducible astronomy