  We present Interplanetary Network (IPN) detection and localization
information for 211 gamma-ray bursts (GRBs) observed as untriggered events by
the Burst and Transient Source Experiment (BATSE), and published in catalogs by
Kommers et al. (2001) and Stern et al. (2001). IPN confirmations have been
obtained by analyzing the data from 11 experiments. For any given burst
observed by BATSE and one other distant spacecraft, arrival time analysis (or
``triangulation'') results in an annulus of possible arrival directions whose
half-width varies between 14 arcseconds and 5.6 degrees, depending on the
intensity, time history, and arrival direction of the burst, as well as the
distance between the spacecraft. This annulus generally intersects the BATSE
error circle, resulting in a reduction of the area of up to a factor of ~650.
When three widely separated spacecraft observed a burst, the result is an error
box whose area is as much as 30000 times smaller than that of the BATSE error
circle.
  Because the IPN instruments are considerably less sensitive than BATSE, they
generally did not detect the weakest untriggered bursts, but did detect the
more intense ones which failed to trigger BATSE when the trigger was disabled.
In a few cases, we have been able to identify the probable origin of bursts as
soft gamma repeaters. The vast majority of the IPN-detected events, however,
are GRBs, and the confirmation of them validates many of the procedures
utilized to detect BATSE untriggered bursts.
