TWO RAPIDLY VARIABLE GALACTIC X-RAY TRANSIENTS OBSERVED WITH<i>CHANDRA</i>,<i>XMM-NEWTON</i>, AND<i>SUZAKU</i>
Bibliographic record
Abstract
We have identified two moderately bright, rapidly variable transients in new and archival X-ray data near the Galactic center. Both objects show strong, flaring variability on timescales of tens to thousands of seconds, evidence of N H variability, and hard spectra. XMMU J174445.5−295044 is seen at 2–10 keV fluxes of 3 × 10 −11 to <10 −12 erg cm −2 s −1 , with N H at or above 5 × 10 22 cm −2 , by XMM-Newton , Chandra , and Suzaku . A likely Two Micron All Sky Survey (2MASS) counterpart with K S = 10.2 shows colors indicative of a late-type star. CXOU J174042.0−280724 is a likely counterpart to the fast hard transient IGR J17407−2808. Chandra observations find F X (2–10 keV) ∼10 −12 erg cm −2 s −1 , with large N H variations (from 2 × 10 22 to >2 × 10 23 cm −2 ). No 2MASS counterpart is visible, to K S >13. XMMU J174445.5−295044 seems likely to be a new symbiotic star or symbiotic X-ray binary, while CXOU J174042.0−280724 is more mysterious, likely an unusual low-mass X-ray binary.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".