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Table 1.
Timing parameters used for Obs. 1, 2, and 3 of SMC X-1.
| Parameter | Unit | Obs. 1 | Obs. 2 | Obs. 3 |
|---|---|---|---|---|
| Start | MJD | 60288.4 | 60292.9 | 60297.3 |
| End | MJD | 60289.9 | 60294.3 | 60298.8 |
| Exposure | ks | 110.6 | 110.0 | 96.8 |
| Epoch | MET (a) | 218971574.938 | 219358107.288 | 219744614.375 |
| Spin period | ms | 696.6750 ± 0.0003 | 696.6712 ± 0.0003 | 696.6659 ± 0.0004 |
| Spin period derivative | 10−11s s−1 | −1.3 ± 0.4 | −2.9 ± 0.4 | −3.0 ± 1.0 |
Notes. The timing solutions refer to the individual observations.
(a)
IXPE MET (Mission Elapsed Time, in seconds) is equal to TMET = (TMJD − Tref)×86400, where Tref = 57754.00080074074. The reported epochs define the zero phases of the pulse profiles in Fig. 3.
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