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It is believed, that an off beaming relativistic jet, produces this weak GRB. Here we use the $E_{\\rm p,i}- E_{\\rm iso}$ and $\\Gamma - E_{\\rm iso}$ relations to determine the Lorentz factor $\\Gamma$ and the viewing angle from the edge of the jet $\\theta'_{\\rm obs}$ of GRB 170817A. Our result shows, $\\Gamma = 13.4 ^{+9.8}_{-5.5}$ and $\\theta'_{\\rm obs} = 4.3^{+1.8}_{-1.5} \\,^{\\circ}$. This corresponds to the on-axis $E_{\\rm p,i} = 415^{+361}_{-167}$ keV and $E_{\\rm iso} = (2.4^{+1.6}_{-1"},"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":"1710.07436","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2017-10-20T07:25:59Z","cross_cats_sorted":[],"title_canon_sha256":"7ab3e49a5b93fa75d6655f8b4477b5aff7d118e23f15c6d185c97e3be7ce89e7","abstract_canon_sha256":"82da2b7077104a256840efa3ff9be88b57b051794d98e8d9bc346e86e403769c"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:26:24.423903Z","signature_b64":"yeIaRUJAwLNA/xYCKApAFFyy118Ho2nFcqD5SwXYT6vQbBQl6cgWBannVSD2Q/Sj1el5rLUSSqUO7hN0I4IXDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"f8e2b67df930a88550505c0b2c0cd89ed69fd57fb0197b41a685d9745e57ba76","last_reissued_at":"2026-05-18T00:26:24.423196Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:26:24.423196Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Determine the Lorentz factor and the viewing angle of GRB 170817A","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"(2) HUJI, (3) NJU), Bin Liao (1), Fa-Yin Wang (3) ((1) HUST, Fei-Fei Wang (1), Qingwen Wu (1), Reetanjali Moharana (2), Wei Chen (1), Wei-Hua Lei (1), Yuan-Chuan Zou (1)","submitted_at":"2017-10-20T07:25:59Z","abstract_excerpt":"GRB 170817A is a weak short gamma-ray burst (GRB) accompanied by the gravitational wave (GW) event GW170817. 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