BeppoSAX has been added to the 3rd Interplanetary Network of gamma-ray burst detectors. Of the ≈8 events observed to date by Ulysses and the BeppoSAX Gamma-Ray Burst Monitor (GRBM), four have been localized by triangulation, resulting in annuli whose 3 &sgr; widths are as small as63″.These data give error boxes whose sizes can be as much as an order of magnitude smaller than those obtained with the SAX Wide Field Camera (WFC). They can be used to confirm the association between fading X-ray and optical sources and gamma-ray bursts. ©1998 American Institute of Physics.