{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2008:RPXI7BNMWV2YN2YVVSEBHGWAHY","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"6e5e35c2ae848db4ce2384c1e9eba32549919b551d9f74469f184a25bf320ccc","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-10-16T12:31:59Z","title_canon_sha256":"0a3ce5bb5f317fc198d751195da17c496f43baa5318bf6934ae5f02dc6151955"},"schema_version":"1.0","source":{"id":"0810.2897","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0810.2897","created_at":"2026-05-18T02:35:14Z"},{"alias_kind":"arxiv_version","alias_value":"0810.2897v2","created_at":"2026-05-18T02:35:14Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0810.2897","created_at":"2026-05-18T02:35:14Z"},{"alias_kind":"pith_short_12","alias_value":"RPXI7BNMWV2Y","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_16","alias_value":"RPXI7BNMWV2YN2YV","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_8","alias_value":"RPXI7BNM","created_at":"2026-05-18T12:25:58Z"}],"graph_snapshots":[{"event_id":"sha256:153545b4ffd54e0113b48ee7131cb20a2b3097e7f3d01440359afe70e764d131","target":"graph","created_at":"2026-05-18T02:35:14Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"paper":{"abstract_excerpt":"We report the clear detection of the 2175A dust absorption feature in the optical afterglow spectrum of the gamma-ray burst (GRB) GRB070802 at a redshift of z=2.45. This is the highest redshift for a detected 2175A dust bump to date, and it is the first clear detection of the 2175A bump in a GRB host galaxy, while several tens of optical afterglow spectra without the bump have been recorded in the past decade. The derived extinction curve gives A_V=0.8-1.5 depending on the assumed intrinsic slope. Of the three local extinction laws, an LMC type extinction gives the best fit to the extinction c","authors_text":"(2) ESO, (3) UCSC, 4), (4) Stockholm, (5) U. Oslo), A. C. Andersen (1), \\'A. El\\'iasd\\'ottir (1), A. O. Jaunsen (5) ((1) DARK, C. Ledoux (2), D. Malesani (1), D. Watson (1), J. Hjorth (1), J. P. U. Fynbo (1), J. Sollerman (1, J. X. Prochaska (3), P. M. Vreeswijk (1)","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-10-16T12:31:59Z","title":"Dust Extinction in High-z Galaxies with GRB Afterglow Spectroscopy - The 2175{\\AA} Feature at z=2.45"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0810.2897","kind":"arxiv","version":2},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:04a6329d11e1de98076be2f9b58573e9385ceca16bb0e23d6ab8ef0dfc4c1f4e","target":"record","created_at":"2026-05-18T02:35:14Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"6e5e35c2ae848db4ce2384c1e9eba32549919b551d9f74469f184a25bf320ccc","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-10-16T12:31:59Z","title_canon_sha256":"0a3ce5bb5f317fc198d751195da17c496f43baa5318bf6934ae5f02dc6151955"},"schema_version":"1.0","source":{"id":"0810.2897","kind":"arxiv","version":2}},"canonical_sha256":"8bee8f85acb57586eb15ac88139ac03e3ebe55d1fac8e7a9c91331f93f0b60c9","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"8bee8f85acb57586eb15ac88139ac03e3ebe55d1fac8e7a9c91331f93f0b60c9","first_computed_at":"2026-05-18T02:35:14.334017Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:35:14.334017Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"+8f/Suqakad0oP1pxYhPhfHf3T7i9h3yk1QeGEAXqkZhUBlx8ev/nv/BTwK2QCgWYLkQSl7x11NxRFFgzQMsCA==","signature_status":"signed_v1","signed_at":"2026-05-18T02:35:14.334436Z","signed_message":"canonical_sha256_bytes"},"source_id":"0810.2897","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:04a6329d11e1de98076be2f9b58573e9385ceca16bb0e23d6ab8ef0dfc4c1f4e","sha256:153545b4ffd54e0113b48ee7131cb20a2b3097e7f3d01440359afe70e764d131"],"state_sha256":"77449c8a5e94893cc9b71664896d5f11aa1c652239beae2796619366613141d6"}