Pith Number

pith:LUAKGUGQ

pith:2013:LUAKGUGQD4CT62J53DRE7D52JT

not attested not anchored not stored refs pending

A ~3.8 hour Periodicity from an Ultrasoft Active Galactic Nucleus Candidate

(2) IRAP, Dacheng Lin (1), Didier Barret (2) ((1) University of Alabama, France), Jimmy A. Irwin (1), Natalie A. Webb (2), Olivier Godet (2), USA

arxiv:1309.4440 v2 · 2013-09-17 · astro-ph.HE · astro-ph.GA

Open paper page JSON Open Graph Bundle Merged state Verified badge What is a Pith Number?

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{LUAKGUGQD4CT62J53DRE7D52JT}

Prints a linked badge after your title and injects PDF metadata. Compiles on arXiv. Learn more · Embed verified badge

Record completeness

1 Bitcoin timestamp

2 Internet Archive

3 Author claim open · sign in to claim

4 Citations open

5 Replications open

✓ Portable graph bundle live · download bundle · merged state

The bundle contains the canonical record plus signed events. A mirror can host it anywhere and recompute the same current state with the deterministic merge algorithm.

Receipt and verification

First computed	2026-05-18T01:47:36.331994Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

5d00a350d01f053f693dd8e24f8fba4cfdb54cc47325ad3066f3ed8d93497e79

Aliases

arxiv: 1309.4440 · arxiv_version: 1309.4440v2 · doi: 10.48550/arxiv.1309.4440 · pith_short_12: LUAKGUGQD4CT · pith_short_16: LUAKGUGQD4CT62J5 · pith_short_8: LUAKGUGQ

Agent API

Resolver JSON Graph JSON Events JSON Schema Signing key

Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/LUAKGUGQD4CT62J53DRE7D52JT \
  | jq -c '.canonical_record' \
  | python3 -c "import sys,json,hashlib; b=json.dumps(json.loads(sys.stdin.read()), sort_keys=True, separators=(',',':'), ensure_ascii=False).encode(); print(hashlib.sha256(b).hexdigest())"
# expect: 5d00a350d01f053f693dd8e24f8fba4cfdb54cc47325ad3066f3ed8d93497e79

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "37df66865a19c9f31d106254301f887c5314f1d91e15ecf1b71a4a56694f1876",
    "cross_cats_sorted": [
      "astro-ph.GA"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.HE",
    "submitted_at": "2013-09-17T19:59:59Z",
    "title_canon_sha256": "e994de189b566beeff2c2a62139d4c0fcc2ede5e1c1059b39343bec38a4378ef"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1309.4440",
    "kind": "arxiv",
    "version": 2
  }
}