Table 1: Overview of the nine most frequent burster sources in the Galactic center region. They are ordered in decreasing number of bursts observed per source with the WFC. For each source a factor (conv.) in erg/count is derived to convert photon flux to energy flux in 2-28 keV . We also show the net exposure for each individual source and the distance as quoted in the literature. For each distance estimate we assume an error of 30%. The distances are derived from: [1] Galloway et al. (2002), [2] Muno et al. (2000), [3] in 't Zand et al. (1999), [4] Lutovinov et al. (2001), [5] Muno et al. (2001), [6] Gottwald et al. (1989), [7] Augusteijn et al. (1998), [8] Kuulkers & van der Klis (2000), [9] Heasley et al. (2000).

Source	#bursts	Exp. time	Conv.	d	Ref.
	WFC	(Ms)	(10-8)	(kpc)
GX 354-0	423	7.4	1.9	5.4	[1]
KS 1731-260	339	6.7	1.5	7.0	[2]
GS 1826-24	260	6.5	1.9	8.0	[3]
A 1742-294	178	7.0	2.2	8.5	[4]
4U 1702-429	104	8.9	1.7	6.7	[5]
4U 1705-44	66	8.7	1.8	8.9	a
4U 1636-536	61	4.7	1.5	5.9	[7]
GX 3+1	61	6.9	1.6	4.5	[8]
4U 1820-30	49	7.1	1.6	7.6	[9]

a: Distance estimated from [6].