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(2012) have reported the detection of eight transitions of a closed-shell, linear molecule (B11244) in observations toward the Horsehead PDR, which they attribute to the $l$-C$_3$H$^+$ cation. Recent high-level \\textit{ab initio} calculations have called this assignment into question; the anionic C$_3$H$^-$ molecule has been suggested as a more likely candidate. Here, we examine observations of the Horsehead PDR, Sgr B2(N), TMC-1, and IRC+10216 in the context of both $l$-C$_3$H$^+$ and C$_3$H$^-$. We find no observational evidence of $K_a = 1$ lines which should be present were the"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1312.0153","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2013-11-30T21:06:59Z","cross_cats_sorted":[],"title_canon_sha256":"a252ff15b3139249a3ff8d71577f5004a44e88717756a0213146aef9e5b3c7ca","abstract_canon_sha256":"65e516777a0e279a5eb4340f553605920e3687a22f21ed9019c65620f5c25b35"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:46:04.543672Z","signature_b64":"1nfrRRsTKvt8iQ5qLj4LpkA5f8aXfiXPopkqo6+WFZsmGp4jIuXRAcfIy2BfXu1VG2aK/f1GVXb/rjqjnN56CA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"2423943110ff02c398572b74b2078cca0e82f2a157f90cce7c8848eec3fd8572","last_reissued_at":"2026-05-18T01:46:04.543256Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:46:04.543256Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"An observational investigation of the identity of B11244 ($l$-C$_3$H$^+$/C$_3$H$^-$)","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Anthony J. 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