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Table 4:

Average burst recurrence time estimates for various instruments during three periods.
1996-2000 flaring period (I) 2001-2002 calm period (II) 2003-2007 flaring period (III)
Inst $t_{\rm exp}$ na $\delta t_{\rm b}$b Inst $t_{\rm exp}$ n $\delta t_{\rm b}$ Inst $t_{\rm exp}$ n $\delta t_{\rm b}$
  (d)   (d)   (d)   (d)   (d)   (d)
WFC 24.9 1 11-83 WFC 2.3 0 >5 WFC - - -
ASM 27.5 2 7-31 ASM 9.6 0 >19 ASM 20.5 4 3-9
PCA 9.6 0 >19 PCA 3.7 1 2-12 PCA 9.4 0 >19
FREGATE - - - FREGATE $\simeq$65 2 17-72 FREGATE $\simeq$129 11 9-16
ISGRI - - - ISGRI - - - ISGRI 25.3 2 7-28
All $\simeq$62 3 12-39 All $\simeq$81 2c 22-90 All $\simeq$184 17 9-14

Notes. (a) n = number of bursts observed in the considered period; (b)  $\delta t_{\rm b}$ = expected average burst recurrence time based on Poisson likelihood 1$\sigma $ limits, see text; (c) Note that PCA and FREGATE observed one of the bursts simultaneously, see Sect. 3.1.2.


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