Pith Number

pith:GX3LX64S

pith:2025:GX3LX64SYTGMC236KO6O4KRWYX

not attested not anchored not stored refs pending

Observation of Galactic center in the sub-MeV gamma-ray band with electron-tracking Compton camera

Atsushi Takada, Kei Yoshikawa, Ken Onozaka, Mitsuru Abe, Taito Takemura, Tomonori Ikeda, Toru Tanimori, Yoshitaka Mizumura, Yuta Nakamura

A balloon-borne electron-tracking Compton camera detected gamma rays from the Galactic center in the 150-600 keV band at 7.9 sigma significance.

arxiv:2509.15851 v4 · 2025-09-19 · astro-ph.HE · hep-ex

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\usepackage{pith}
\pithnumber{GX3LX64SYTGMC236KO6O4KRWYX}

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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.

Claims

C1strongest claim

We report the direct detection of gamma-ray emission from the Galactic center in the 150-600 keV band using the electron-tracking Compton camera (ETCC)... revealed a 7.9σ excess over the background in the image map from the Galactic center region.

C2weakest assumption

The background model and instrument response function accurately isolate the Galactic center signal without significant contamination from atmospheric or instrumental effects during the short balloon flight.

C3one line summary

The ETCC instrument detected a 7.9 sigma gamma-ray excess from the Galactic center in the sub-MeV band during a one-day balloon flight, with positronium flux consistent with INTEGRAL measurements.

Formal links

1 machine-checked theorem link

Receipt and verification

First computed	2026-06-23T01:11:57.034693Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

35f6bbfb92c4ccc16b7e53bcee2a36c5f6ab1bff45b8843ae6966bc16567f0c0

Aliases

arxiv: 2509.15851 · arxiv_version: 2509.15851v4 · doi: 10.48550/arxiv.2509.15851 · pith_short_12: GX3LX64SYTGM · pith_short_16: GX3LX64SYTGMC236 · pith_short_8: GX3LX64S

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/GX3LX64SYTGMC236KO6O4KRWYX \
  | 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: 35f6bbfb92c4ccc16b7e53bcee2a36c5f6ab1bff45b8843ae6966bc16567f0c0

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "7e59d117c5783f96795ff2675cb529516cbe8ab2599bf3c4a5609eb92579d833",
    "cross_cats_sorted": [
      "hep-ex"
    ],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "astro-ph.HE",
    "submitted_at": "2025-09-19T10:42:46Z",
    "title_canon_sha256": "e255fa27b15e3776469901b849b18f63af82f44b11c3da3b067a1128d6dc9508"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2509.15851",
    "kind": "arxiv",
    "version": 4
  }
}