The source values for J1130+0921 give opposite spin signs in an ATNF 2.9.0 audit

We screen ATNF 2.9.0 for negative spin-period derivatives without a listed globular-cluster association. Eight entries pass. Four strong entries are known Galactic-centre acceleration cases. Three entries have errors larger than their derivatives. J1130+0921 has a six-sigma frequency increase, but its source table lists a positive period derivative. The two values violate P = 1/f. A pinned RRATalog release uses the positive period derivative and a matching negative frequency derivative. It cites the same paper and does not provide independent observation. The audit identifies a data conflict that prevents a secure new spin-up claim. We provide code, selected records, exact input hashes, numerical checks, and a figure. We did not refit pulse arrival times or establish which source sign is correct.

astronomy · ATNF · pulsar · J1130+0921 · data consistency · negative period derivative