  We have discovered three certain (SAX J1324.5-6313, 2S 1711-339 and SAX
J1828.5-1037) and two likely (SAX J1818.7+1424 and SAX J2224.9+5421) new
thermonuclear X-ray burst sources with the BeppoSAX Wide Field Cameras, and
observed a second burst ever from a sixth one (2S 0918-549). Four of them
(excluding 2S 1711-339 and 2S 0918-549) are newly detected X-ray sources from
which we observed single bursts, but no persistent emission. We observe the
first 11 bursts ever from 2S 1711-339; persistent flux was detected during the
first ten bursts, but not around the last burst. A single burst was recently
detected from 2S 0918-549 by Jonker et al.(2001); we observe a second burst
showing radius expansion, from which a distance of 4.2 kpc is derived.
According to theory, bursts from very low flux levels should last ~100 s. Such
is indeed the case for the last burst from 2S 1711-339, the single burst from
SAX J1828.5-1037 and the two bursts from 2S 0918-549, but not for the bursts
from SAX J1324.5-6313, SAX J1818.7+1424 and SAX J2224.9+5421. The bursts from
the latter sources all last ~20 s. We suggest that SAX J1324.5-6313, SAX
J1818.7+1424, SAX J1828.$-1037 and SAX J2224.9+5421 are members of the recently
proposed class of bursters with distinctively low persistent flux levels, and
show that the galactic distribution of this class is compatible with that of
the standard low-mass X-ray binaries.
