Precise interplanetary network localization of the bursting pulsar GRO J1744-28

We analyze 426 observations of the bursting pulsar GRO J1744(28 by Ulysses and BATSE. Triangu- lating each burst and statistically combining the triangulation annuli, we obtain a 3 p error ellipse whose area is 532 arcsec2. The accuracy of this statistical method has been independently veri—ed with obser- vations of the soft gamma repeater SGR 1900)14. The ellipse is fully contained within the 1@ radius ASCA error circle of the soft X-ray counterpart and partially overlaps the 10@@ radius ROSAT error circle of a source which may also be the soft X-ray counterpart. A variable source which has been pro- posed as a possible IR counterpart lies at the edge of the 3 p error ellipse, making it unlikely from a purely statistical point of view to be associated with the bursting pulsar. Subject headings: pulsars: individual (GRO J1744(28) ¨ stars: neutronX-rays: stars