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313875415096098868known object
RA 150.860981°Dec +2.0821°b +42.65°l 237.54°
gate v1features v1percentile_composite 1.0.0scored 2026-06-19 03:01 UTC
Anomaly Score
0.7410
rich tier · 55 scoring columns
η_e (primary band) · bottom 0.27% of pool
Driving Signal
η_e (primary band)
↓ below pool median
pct 0.272% · col dense_primary_eta_e
Astrometric Scatter
0.1435″
RA ±0.1582″ · Dec ±0.1271″
304 epochs · 176.7 d baseline
Candidate Depth — Evidence Quality at a Glance
Spectral Index
Γ = −0.2 ± 0.0
17% relative error — high uncertainty
Epochs
304
adequate
Bands
6
of 6 LSST bands
Gate-Passing
303
rich tier
Baseline
176.7 d
first–last detection
Primary Band
g
84 epochs
⚠ Negative difference flux in at least one epoch — object was brighter than the survey template at that time. Consistent with a fading transient or pre-existing source in the co-add. Spectral index computed across all detections regardless of flux sign.
Archival Crossmatch — All Four Catalogs
Gaia DR3matched
Stellar positions, parallax, proper motion — 1.5 billion sources
Sep 0.098″
Source ID 3836104917220037248
G mag 18.97
Parallax -0.158 ± 0.242 mas (SNR -0.7)
Class extragalactic_candidate
RUWE 0.95
checked 2026-06-18 02:46 UTC
SIMBADmatched
Astronomical object database — named objects and transients
Sep 0.092″
ID 4FGL J1003.4+0205
Type BLL — BL Lac Object
checked 2026-06-18 02:46 UTC
AllWISEmatched
Wide-field infrared survey (3.4–22 μm) — AGN, galaxies, dusty stars
Sep 0.232″
Designation J100326.62+020455.7
W1 15.08 W2 14.38
W1−W2 0.70
checked 2026-06-18 02:46 UTC
TNSnot queried
Transient Name Server — reported astronomical transients
Not queried — no TNS API credentials configured
checked 2026-06-18 02:46 UTC
SIMBAD: 4FGL J1003.4+0205
Galactic Context
Galactic Latitude
b = +42.65°
Mid/high latitude — lower galactic foreground
Gaia Parallax / Proper Motion
See Gaia match above — parallax and proper motion available.
Gaia Variable Flag
flagged
Gaia photometric variability flag set in detection metadata
Verdict b = +42.7° places this object at mid-galactic latitude, toward galactic longitude l = 237.5°. Gaia parallax/proper motion can be used to assess galactic membership directly.
Light Curve — Flux vs Time
303 gate-passing1 excluded (hollow)u, g, r, i, z, y bandsgate v1flux in nJy · zero = survey template level
Points with ±1σ error bars. No fit or interpolation drawn — 303 detections in 6 bands is insufficient for a defensible curve.
What Would Resolve This Candidate
  1. 1
    Optical spectrum

    An optical spectrum would reveal redshift directly (if extragalactic) or stellar spectral type (if galactic). The current driving feature Γ = −0.2 ± 0.0 (17% relative error) is a photometric proxy — a spectrum is the direct measurement.

  2. 2
    More multi-band epochs

    Currently 304 detections in 6 bands over 176.7 days. All four LSST color indices are measured.

  3. 3
    Sub-arcsecond host imaging

    A deep image in the primary band (g) at sub-arcsecond resolution would determine whether a faint host galaxy underlies the transient position — a distinction Rubin difference frames at their current depth cannot make.

  4. 4
    Template epoch check

    Negative difference flux implies the source was brighter when the survey template co-add was constructed. Inspecting the co-add at this position would confirm whether the source pre-dates LSST coverage, which would strongly favour a persistent extragalactic nucleus over a new transient.

Show Your Work — Provenance & Verification

Control-Set Verification

Before trusting any "no match" result, the crossmatch infrastructure was validated against three controls: (1) a bright Gaia star — returned a clean Gaia DR3 match with correct separation; (2) a known AGN from SIMBAD — matched with the correct object type; (3) a blank sky patch — all four catalogs returned empty cones, confirming the code does not fabricate matches on empty fields. Only after all three controls passed were any "no match" verdicts trusted.

Noise-Aware Anomaly Scoring

Scores use a percentile_composite scorer (v1.0.0). Each feature column is ranked within its tier — sparse objects are compared only to other sparse-tier objects, so a 4-epoch candidate is not penalised against a 200-epoch one. The IsolationForest threshold is calibrated to the 99th percentile of the tier distribution.

This object sits in the rich tier with 55 scoring columns. Its anomaly score of 0.7410 means it landed in the bottom 0.27% of its tier on the driving feature.

Detection Reliability

Fink real/bogus classifier: mean 0.783, min 0.104. Minimum reliability is close to the 0.5 decision boundary — at least one detection may be borderline. Inspect image stamps before reporting.

Pipeline Versions

Feature set v1 · gate v1 · model percentile_composite 1.0.0 · classified 2026-06-19 02:37 UTC.

Score Run

Run ID: 0446da9b-077c-4b88-a253-7acc335d4e0d