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170441938603869451novel candidate
RA 256.741050°Dec −14.4807°b +15.39°l 7.31°
gate v1features v1percentile_composite 1.0.0scored 2026-07-26 03:01 UTC
Anomaly Score
0.3994
moderate tier · 37 scoring columns
· bottom < 0.1% of pool
Driving Signal
↑ above pool median
pct 0.000% · col
Astrometric Scatter
0.0059″
RA ±0.0057″ · Dec ±0.0061″
5 epochs · 42.9 d baseline
Candidate Depth — Evidence Quality at a Glance
Epochs
5
thin — inspect stamps
Bands
1
of 6 LSST bands
Gate-Passing
5
moderate tier
Baseline
42.9 d
first–last detection
Primary Band
i
5 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 DR3no match
Stellar positions, parallax, proper motion — 1.5 billion sources
Empty cone — 0 sources within search radius
checked 2026-07-08 03:08 UTC
SIMBADno match
Astronomical object database — named objects and transients
Empty cone — 0 sources within search radius
checked 2026-07-08 03:08 UTC
AllWISEno match
Wide-field infrared survey (3.4–22 μm) — AGN, galaxies, dusty stars
Empty cone — 0 sources within search radius
checked 2026-07-08 03:08 UTC
TNSnot queried
Transient Name Server — reported astronomical transients
Not queried — no TNS API credentials configured
checked 2026-07-08 03:08 UTC
No counterpart in Gaia DR3, SIMBAD, AllWISE, or TNS (TNS skipped — no credentials)
Galactic Context
Galactic Latitude
b = +15.39°
Low latitude — elevated stellar density and dust extinction
Gaia Parallax / Proper Motion
No Gaia source in cone. Parallax and proper motion unavailable — galactic membership cannot be settled by kinematics alone.
Gaia Variable Flag
not flagged
No Gaia variability flag in detection metadata
Verdict b = +15.4° places this object in a low-latitude field, toward galactic longitude l = 7.3°. No Gaia counterpart means galactic membership cannot be resolved by kinematics — a spectrum or additional astrometric epochs are needed. Empty AllWISE cone argues against a dust-embedded galactic counterpart.
Light Curve — Flux vs Time
5 gate-passingi bandgate v1flux in nJy · zero = survey template level
Points with ±1σ error bars. No fit or interpolation drawn — 5 detections in 1 band 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 is a photometric proxy — a spectrum is the direct measurement.

  2. 2
    More multi-band epochs

    Currently 5 detections in 1 bands over 42.9 days. Color indices g−r, r−i, i−z, z−y are unmeasured — insufficient epochs in one or both component bands. Additional detections spanning those gaps would constrain spectral shape and reduce reliance on the single measured index.

  3. 3
    Sub-arcsecond host imaging

    A deep image in the primary band (i) 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 moderate tier with 37 scoring columns. Its anomaly score of 0.3994 means it landed in the bottom < 0.1% of its tier on the driving feature.

Detection Reliability

Fink real/bogus classifier: mean 0.956, min 0.939. All detections are above the 0.6 reliability threshold.

Pipeline Versions

Feature set v1 · gate v1 · model percentile_composite 1.0.0 · classified 2026-07-08 03:09 UTC.

Score Run

Run ID: d87ebea4-f00e-4ebc-938f-714a13eadbb8