Version 3.71.0

Summary

This release includes PR #156 and PR #157.

Pull Request #156

Details:

• Adds a power step to the OBA model to account for the model error shift that began near 2025:215
• Updates the OBA thermal model with a full model fit.
• Adds a power step to the ACA model to account for the model error shift that began near 2025:215 (no full parameter refit)

Pull Request #157

Details:

This adds the 2025-10 acquisition probability model which was created and validated in sot/aca_stats#22, including:

• https://github.com/sot/aca_stats/blob/master/fit_acq_model-2025-10-local-quadratic.ipynb
• https://github.com/sot/aca_stats/blob/master/compare-acq-model-to-flight-data-2025-10.ipynb

Additional Information

Files Modified:

• chandra_models/__init__.py: version increment to 3.71.0
• chandra_models/xija/fwdblkhd/4rt700t_spec.json: full general parameter update, added power step function
• chandra_models/xija/aca/aca_spec.json: added power step function

Files Added:

• chandra_models/aca_acq_prob/grid-local-quadratic-2025-10.fits.gz

Files Removed:

• None