A Second Glitch from the "Anomalous" X-Ray Pulsar 1RXS J170849.0-4000910
Bibliographic record
Abstract
We report on 5.4 yr of phase-coherent timing, using the Rossi X-Ray Timing Explorer, of the X-ray pulsar 1RXS J170849.0-4000910 (1RXS J1708-4009), a member of the class known as "anomalous X-ray pulsars." This object exhibited a rotational glitch in 1999. Here we report a second, much larger rotational glitch that occurred ~1.5 yr after the first. We show that the recoveries from the two glitches are significantly different, with the first showing only a possible slow, approximately linear recovery, while the second showed a nearly complete recovery on a timescale of ~50 days. The approximately exponential recovery timescale of the second glitch is similar to that seen recently in 1E 2259+586 at the time of a major outburst. This suggests that 1RXS J1708-4009 undergoes similar bursting behavior, although with our sparse observations we have detected no other evidence of bursts from this source.
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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 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| 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".