Eight TESS visits do not resolve the fixed TrES-1 b precession width prediction under independent normal errors with equal variance

We test the transit width of TrES-1 b in 54 accepted events from eight public TESS visits in 2019–2024. We measure width at half depth with a fixed transit profile and fixed 120-second exposure averaging. Corrected flux gives a slope of -0.16 seconds per Julian year. The nominal 95% Student t interval is -6.22 to +5.90. It assumes independent normal visit errors with equal unknown variance. A check that includes an event variance floor gives -13.16 to +12.84. In 128 residual-block trials per input slope, the nominal intervals contain the input in 92.2% of trials. The variance-floor check gives 96.9%. These trials add no shared visit error. The rounded median precession parameters in Hagey et al. (2025) predict a 12.13-second width increase at our fixed geometry. The predicted slope is +2.46 seconds per year. Both zero slope and this prediction lie within the corrected-flux intervals. An exploratory comparison uses the same samples and weights for aperture and corrected flux. The aperture-minus-corrected slope is +7.99 seconds per year, with a nominal interval of +1.64 to +14.35. That interval includes zero when the 2019 visit is removed. The width test does not select a physical orbit model. It does not test the full precession posterior. The package contains original data, source hashes, event decisions, code, recovery trials, figures, and repeat instructions.

TrES-1 b · TESS · transit width · apsidal precession · exposure integration · flux correction · reproducible astronomy