GCN Circular 152
GRB 980703 Very Long Baseline Interferometry Observations G. B. Taylor, D. A. Frail, A. J. Beasley (NRAO) and S. R. Kulkarni (CIT) report: Using the Very Long Baseline Array (VLBA) we have detected the radio source identified as the afterglow from GRB 980703 (GCN #128). During a 5 hour VLBA run on 1998 Aug 2 the radio source was found to have a flux density of 580 +/- 60 microJy at 8.4 GHz. The source is unresolved by these observations with a size less then 0.3 mas (size < 2 pc given the redshift of 0.9660 reported by Djorgovski et al. in GCN #139). The position of GRB 980703 is R.A.=23h59m06.6661s, Dec.=+08d35'07.09390" (equinox J2000) with an uncertainty of approximately +/-0.0005" in each coordinate. This measurement is consistent with that given by Frail et al. (GCN #141) with errors of +/- 0.05". Given the accuracy of the VLBA position for the afterglow (0.5 mas = 4 pc), it would be of interest to register the afterglow on subarcsecond resolution observations of the host galaxy. Accurate absolute astrometry at other wavebands are encouraged. This report can be cited.