Table 2.
Pulse-phase timing solutions of SRGA J1444.
| NICER | XMM–Newton | NuSTAR | IXPE | |
|---|---|---|---|---|
| Interval (MJD) | 60 361.837–60 383.544 | 60 368.106–60 369.374 | 60 366.465–60 369.881 | 60 367.615–60 377.619 |
| ϕ(T0) | 0.47 (1) | 0.500 (7) | 0.400 (5) | 0.37 (1) |
| ν(T0) (Hz) | 447.87156112 (2) | 447.8715620 (3) | 447.87156127 (2) | 447.87156138 (8) |
 (Hz s−1) |
< 1.2 × 10−13 | < 7.0 × 10−12 | < 1.5 × 10−12 | < 3.0 × 10−13 |
| a1 sin i/c (lt-s) | 0.65052 (2) | 0.650491 (5) | 0.650498 (3) | 0.650486 (13) |
| Porb (s) | 18 803.65 (1) | 18 803.65 (1) | 18 803.673 (4) | 18 803.665 (4) |
| Tasc (MJD) | 60 361.641306 (3) | 60 361.641305 (6) | 60 361.641297 (2) | 60 361.641310 (5) |
| e | < 9 × 10−5 | < 9 × 10−5 | < 3 × 10−5 | < 1.0 × 10−4 |
| χ2 (d.o.f.) | 93.0 (53) | 368.5 (212) | 1261.8 (762) | 121.3 (53) |
Notes. All the solutions presented in the table were obtained by folding the data around νfold = 447.87156116029 Hz with a reference epoch MJD 60 361.8. To facilitate the comparison, the frequency estimates were evaluated at T0 = MJD 60 368.0. All the epochs reported here are in the barycentric dynamical time (TDB) system. Uncertainties at the 1σ c.l. are reported in parentheses. Upper limits are given at a 90% c.l.
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