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The local rate is 1.3^{+0.6-0.7} [Gpc^-3 yr^-1]. The luminosity function is well described by a broken power law with a break at L* = 10^52.5{+-0.2}[erg/sec] and with indices alpha = 0.2^{+0.2-0.1} and beta = 1.4^{+0.3-0.6}. The recently detected GRB 090423, with redshift ~8, fits nicely into the model's prediction, ver"},"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":"0912.0709","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2009-12-03T20:20:39Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"79f2cedd228da207395070bc382d9fd4496c0aff17da0a6495682ff014edd600","abstract_canon_sha256":"39ed4743656ccd07850d7cfa9d3c6b863843ff018efc4067204370ceb62cb52e"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:42:23.922252Z","signature_b64":"y74ZMBooAIXrB2uOHusfC6n2+XuPX0wa4cNhao/hlfZSSBf96Pk+NdCfsY9oTK4qeQQ1AQJnlm3a3ECqErPUBw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"29343c0a8ac8d54050e7b2e4b06382c857eeebaa104103a0d1c020e85a90d5a7","last_reissued_at":"2026-05-18T04:42:23.921807Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:42:23.921807Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"The luminosity function and the rate of Swift's Gamma Ray Bursts","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO"],"primary_cat":"astro-ph.HE","authors_text":"David Wanderman, Tsvi Piran","submitted_at":"2009-12-03T20:20:39Z","abstract_excerpt":"We invert directly the redshift - luminosity distribution of observed long Swift GRBs to obtain their rate and luminosity function. 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