Skip to main content
Announcing GCN Classic Migration Survey, End of Legacy Circulars Email. See news and announcements

GCN Circular 152

Subject
GRB980703 Very Long Baseline Interferometry
Date
1998-08-27T15:49:28Z (26 years ago)
From
Greg Taylor at NRAO <gtaylor@aoc.nrao.edu>
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.
Looking for U.S. government information and services? Visit USA.gov