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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 80248 s for the first nondetection and 20100 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, 20100 s, after the burst peak.

(a)

For this burst, not enough data were recorded before the burst and the QPO parameters have been estimated away from the burst (200 s after), and taken as representative of the QPO parameters before the burst.

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