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In July 1997 near its hitherto maximum X-ray brightness intense multifrequency observations of Mrk 501 have been performed at radio, near infrared, optical, X-ray, and VHE gamma-ray frequencies.\n Here we report on Rossi X-ray Timing Explorer (RXTE) observations carried out in 1997 between July 11 and July 16. The X-ray spectrum has been well detected up to 100 keV and is best described by a broken power law with spectral indices alpha1=0.70 and alpha2=0.94 below and above the break energy 5.8 keV.\n The X-ra"},"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":"astro-ph/9801007","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"1998-01-02T19:13:29Z","cross_cats_sorted":[],"title_canon_sha256":"2beff80092f29e9a95be9a64f40b14c4098ff9b9523533c8f7548c4d63c37084","abstract_canon_sha256":"08ad326f79f6240900e27ee12409ba1cb2530d70408284d146c4f367adf0ddd0"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:07:37.890430Z","signature_b64":"Fwo1gAKU9W8GvkJV480HNXRFQBY7bUSTlEm8F+3RPL+RF7BJtghC8FyYIFMr9Jo5qaXih5eoS5WAc5rbJPYCBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"ca9b182e5b6f3931dc36ca5faf2c4961afa7f17ed0dc0873e837021e6ff216f5","last_reissued_at":"2026-05-18T01:07:37.889950Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:07:37.889950Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Markarian 501 in X-ray bright state - RXTE observations","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"G. 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