Table 2.
Spin ephemeris parameters derived from the AstroSat/LAXPC observation along with the evolution of the spin frequency during the 2024 outburst based on the measurements from NICER, AstroSat, and NuSTAR observations.
| Parameters | AstroSat | Spin evolution | |
|---|---|---|---|
| Linear a | Quadratic | ||
| T0 (MJD) | 60411.0 | ||
| ν0 (mHz) | 124.56286 (15) | 124.56266 (14) | 124.56298 (12) |
 (10−11 Hz s−1) |
2.4 (2) | 2.45 (8) | 2.10 (4) |
 (10−17 Hz s−2) |
– | – | −2.11 (14) |
Notes. All errors reported in this table are at a 68% (1σ) confidence level. aThe last measurement of NICER at MJD 60418 was not included in this fit.
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