What ignites on the neutron star of 4U 0614+091? | Astronomy & Astrophysics (A&A)

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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	$t_{\rm exp}$	n^a	$\delta t_{\rm b}$ ^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	2^c	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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