Table 2
kHz QPO shapes before and after the X-ray bursts.
| Source | Burst ID | Freqpers | R pers | rmspers (%) | wpers (Hz) | Freqburst | R burst | rmsburst (%) | wburst (Hz) |
|
|
|||||||||
| 4U 1636-536 | 4 | 848 | 8.5 ± 0.4 | 10.4 ± 0.2 | 3.5 ± 0.3 | (u.l.) | 1.2 (u.l.) | 4.9 (u.l.) | (u.l.) |
| 6 | 874 | 6.7 ± 0.4 | 10.0 ± 0.3 | 4.3 ± 0.4 | 876 ± 2.5 | 7.9 ± 2.8 | 10.9 ± 1.9 | 13.8 ± 6.3 | |
| 9 | 862 | 8.2 ± 0.4 | 11.9 ± 0.3 | 5.5 ± 0.4 | 855 ± 0.6 | 5.3 ± 1.9 | 9.8 ± 1.8 | 4.8 ± 3.0 | |
| 21 | 859 | 9.5 ± 0.5 | 11.4 ± 0.3 | 5.6 ± 0.5 | 854 ± 0.4 | 7.2 ± 1.3 | 10.0 ± 0.9 | 3.5 ± 0.9 | |
| 22 | 823 | 5.9 ± 0.4 | 10.3 ± 0.3 | 3.9 ± 0.3 | (u.l.) | 2.6 (u.l.) | 6.9 (u.l.) | (u.l.) | |
| 23 | 825 | 5.4 ± 0.3 | 10.0 ± 0.3 | 2.2 ± 0.2 | (u.l.) | 2.6 (u.l.) | 7.1 (u.l.) | (u.l.) | |
| 39 | 802 | 3.2 ± 0.3 | 8.7 ± 0.4 | 2.0 ± 0.4 | 796 ± 2.1 | 5.1 ± 1.8 | 11.3 ± 2.0 | 8.3 ± 3.8 | |
| 40 | 843 | 5.2 ± 0.4 | 11.0 ± 0.4 | 4.2 ± 0.5 | 839 ± 0.5 | 5.7 ± 1.3 | 11.9 ± 1.4 | 3.7 ± 1.3 | |
| 41 | 820 | 3.9 ± 0.3 | 9.5 ± 0.4 | 2.7 ± 0.3 | 826 ± 0.7 | 5.5 ± 1.4 | 12.0 ± 1.5 | 5.0 ± 1.7 | |
| 168 | 849 | 4.9 ± 0.3 | 10.0 ± 0.3 | 2.7 ± 0.3 | 849 ± 0.7 | 6.7 ± 1.5 | 12.2 ± 1.4 | 5.3 ± 1.6 | |
|
|
|||||||||
| 4U 1608-522 | 4 | 689 | 10.9 ± 0.5 | 12.9 ± 0.3 | 5.6 ± 0.3 | 684 ± 0.5 | 10.9 ± 1.8 | 13.6 ± 1.1 | 5.5 ± 1.3 |
| 5 | 740 | 8.8 ± 0.4 | 12.8 ± 0.3 | 4.7 ± 0.3 | 722 ± 1.2 | 11.6 ± 3.0 | 15.7 ± 2.0 | 12.1 ± 4.4 | |
| 21a | 703 | 10.8 ± 0.4 | 13.2 ± 0.3 | 4.7 ± 0.3 | 704 ± 0.8 | 10.1 ± 2.0 | 13.4 ± 1.3 | 7.9 ± 2.1 | |
| 23 | 813 | 5.8 ± 0.4 | 10.4 ± 0.3 | 4.1 ± 0.3 | 801 ± 2.8 | 6.0 ± 1.8 | 12.8 ± 1.9 | 6.7 ± 2.8 | |
| 24 | 805 | 8.5 ± 0.5 | 12.8 ± 0.4 | 5.7 ± 0.5 | 790 ± 0.5 | 9.3 ± 1.8 | 13.6 ± 1.3 | 5.3 ± 1.5 | |
Notes. Burst ID corresponds to the burst number in the Galloway et al. (2008) burst catalog, Freq to the centroid frequency of the QPO, R to the Lorentzian normalization factor, rms to the rms amplitude of the QPO, and w to its width. The QPO parameters are given both before (pers index) and after the burst (burst index). The errors here are 1σ errors. For bursts 4, 22, and 23 of 4U 1636-536, the QPO rms amplitude 90% confidence upper limits were computed during the nondetection gap, namely 80−248 s for the first nondetection and 20−100 s for the other two using the pre-burst width as well as a frequency fixed to the position of the most significant excess (denoted u.l. in the table). For all other bursts, the QPO parameters after the burst were computed in the same time interval, 20−100 s, after the burst peak.
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