{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2017:MDD7X66KN5YIMRVJ3YA2T3BKOJ","short_pith_number":"pith:MDD7X66K","schema_version":"1.0","canonical_sha256":"60c7fbfbca6f708646a9de01a9ec2a727c946b707dd5ba2a9a89b36ef801c5d7","source":{"kind":"arxiv","id":"1711.06257","version":1},"attestation_state":"computed","paper":{"title":"Bulk Lorentz factors of Gamma-Ray Bursts","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"A. Melandri, F. Nappo, G. Ghirlanda, G. Ghisellini, G. Marcarini, L. Nava, O. S. Salafia, R. Salvaterra, S. Campana","submitted_at":"2017-11-16T18:59:35Z","abstract_excerpt":"Knowledge of the bulk Lorentz factor $\\Gamma_{0}$ of GRBs allows us to compute their comoving frame properties shedding light on their physics. Upon collisions with the circumburst matter, the fireball of a GRB starts to decelerate, producing a peak or a break (depending on the circumburst density profile) in the light curve of the afterglow. Considering all bursts with known redshift and with an early coverage of their emission, we find 67 GRBs with a peak in their optical or GeV light curves at a time $t_{\\rm p}$. For another 106 GRBs we set an upper limit $t_{\\rm p}^{\\rm UL}$. We show that "},"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":"1711.06257","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2017-11-16T18:59:35Z","cross_cats_sorted":[],"title_canon_sha256":"c8ff08b11dd38e6b1546ac293da9c4537d8bec3919a26cee9eea6e96e31828c1","abstract_canon_sha256":"1fa4318bba06eca89551b3d7dde3e4391a1ac5d48eb10db90cdde15736195e73"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:24:48.313373Z","signature_b64":"urWQXmg6riuFJ41kkRAgBEWcbXt8SGqNLabGyGghh0GSVtB/N3FOKuO5Er1kK/ckj1npImRuBjTFsxI+EFR+AA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"60c7fbfbca6f708646a9de01a9ec2a727c946b707dd5ba2a9a89b36ef801c5d7","last_reissued_at":"2026-05-18T00:24:48.312663Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:24:48.312663Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Bulk Lorentz factors of Gamma-Ray Bursts","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"A. Melandri, F. Nappo, G. Ghirlanda, G. Ghisellini, G. Marcarini, L. Nava, O. S. Salafia, R. Salvaterra, S. Campana","submitted_at":"2017-11-16T18:59:35Z","abstract_excerpt":"Knowledge of the bulk Lorentz factor $\\Gamma_{0}$ of GRBs allows us to compute their comoving frame properties shedding light on their physics. Upon collisions with the circumburst matter, the fireball of a GRB starts to decelerate, producing a peak or a break (depending on the circumburst density profile) in the light curve of the afterglow. Considering all bursts with known redshift and with an early coverage of their emission, we find 67 GRBs with a peak in their optical or GeV light curves at a time $t_{\\rm p}$. For another 106 GRBs we set an upper limit $t_{\\rm p}^{\\rm UL}$. We show that "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1711.06257","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"aliases":[{"alias_kind":"arxiv","alias_value":"1711.06257","created_at":"2026-05-18T00:24:48.312764+00:00"},{"alias_kind":"arxiv_version","alias_value":"1711.06257v1","created_at":"2026-05-18T00:24:48.312764+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1711.06257","created_at":"2026-05-18T00:24:48.312764+00:00"},{"alias_kind":"pith_short_12","alias_value":"MDD7X66KN5YI","created_at":"2026-05-18T12:31:31.346846+00:00"},{"alias_kind":"pith_short_16","alias_value":"MDD7X66KN5YIMRVJ","created_at":"2026-05-18T12:31:31.346846+00:00"},{"alias_kind":"pith_short_8","alias_value":"MDD7X66K","created_at":"2026-05-18T12:31:31.346846+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/MDD7X66KN5YIMRVJ3YA2T3BKOJ","json":"https://pith.science/pith/MDD7X66KN5YIMRVJ3YA2T3BKOJ.json","graph_json":"https://pith.science/api/pith-number/MDD7X66KN5YIMRVJ3YA2T3BKOJ/graph.json","events_json":"https://pith.science/api/pith-number/MDD7X66KN5YIMRVJ3YA2T3BKOJ/events.json","paper":"https://pith.science/paper/MDD7X66K"},"agent_actions":{"view_html":"https://pith.science/pith/MDD7X66KN5YIMRVJ3YA2T3BKOJ","download_json":"https://pith.science/pith/MDD7X66KN5YIMRVJ3YA2T3BKOJ.json","view_paper":"https://pith.science/paper/MDD7X66K","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1711.06257&json=true","fetch_graph":"https://pith.science/api/pith-number/MDD7X66KN5YIMRVJ3YA2T3BKOJ/graph.json","fetch_events":"https://pith.science/api/pith-number/MDD7X66KN5YIMRVJ3YA2T3BKOJ/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/MDD7X66KN5YIMRVJ3YA2T3BKOJ/action/timestamp_anchor","attest_storage":"https://pith.science/pith/MDD7X66KN5YIMRVJ3YA2T3BKOJ/action/storage_attestation","attest_author":"https://pith.science/pith/MDD7X66KN5YIMRVJ3YA2T3BKOJ/action/author_attestation","sign_citation":"https://pith.science/pith/MDD7X66KN5YIMRVJ3YA2T3BKOJ/action/citation_signature","submit_replication":"https://pith.science/pith/MDD7X66KN5YIMRVJ3YA2T3BKOJ/action/replication_record"}},"created_at":"2026-05-18T00:24:48.312764+00:00","updated_at":"2026-05-18T00:24:48.312764+00:00"}