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SN 2007gi is characterized by extremely high-velocity (HV) features of the intermediate-mass elements (Si, Ca, and S), with expansion velocities ($v_{\\rm exp}$) approaching $\\sim$15,500 km s$^{-1}$ near maximum brightness (compared to $\\sim$10,600 km s$^{-1}$ for SNe Ia with normal $v_{\\rm exp}$). SN 2007gi reached a $B$-band peak magnitude of 13.25$\\pm$0.04 mag with a decline rate of $\\Delta m_{15}(B)$(true) = 1.33$\\pm$0.09 mag. The $B$-band light curve of SN 2007gi demonstrated a"},"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":"0910.1913","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2009-10-10T11:26:33Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"82400efff441e2778737a201a4fe9e16efbd8c322c42164420ba9c4aeb58c593","abstract_canon_sha256":"203fe40e865e16141869cf6ff236afcad13b3fb371afdf12dadc54b09614f4bb"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:11:24.919226Z","signature_b64":"1IanAiog1IcQYIW5Dd7YW/8iHryaCLzEzCShY3EKtYcu+TkJALwN38LjZ9PiM74BtxaZWw8CAFQNsnw0x1/TDQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"943297b6faee603e48786389a82df7daf16b4df8087464da811e65ddbb993cdd","last_reissued_at":"2026-05-18T02:11:24.917817Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:11:24.917817Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Optical Observations of the Rapidly Expanding Type Ia Supernova 2007gi","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO"],"primary_cat":"astro-ph.SR","authors_text":"A. V. Filippenko, J. Deng, J. Li, J. M. Silverman, L. Wang, M. Ganeshalingam, M. Zhai, P. J. Brown, R. Shang, T. Li, T. N. Steele, T. Zhang, W. Li, X. Wang, X. Zhou, Y. Qiu","submitted_at":"2009-10-10T11:26:33Z","abstract_excerpt":"We present optical photometry and spectra for the Type Ia supernova (SN Ia) 2007gi in the nearby galaxy NGC 4036. SN 2007gi is characterized by extremely high-velocity (HV) features of the intermediate-mass elements (Si, Ca, and S), with expansion velocities ($v_{\\rm exp}$) approaching $\\sim$15,500 km s$^{-1}$ near maximum brightness (compared to $\\sim$10,600 km s$^{-1}$ for SNe Ia with normal $v_{\\rm exp}$). SN 2007gi reached a $B$-band peak magnitude of 13.25$\\pm$0.04 mag with a decline rate of $\\Delta m_{15}(B)$(true) = 1.33$\\pm$0.09 mag. 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