Astron. Astrophys. Suppl. Ser.
Volume 138, Number 3, September 1999Gamma-Ray Bursts in the Afterglow Era Contents Rome, November 3-6, 1998
|Page(s)||445 - 446|
|Published online||15 September 1999|
VLBI observations of GRB afterglows
National Radio Astronomy Observatory (NRAO), Socorro, NM 87801, U.S.A.
2 Division of Physics, Mathematics, and Astronomy 105-24, California Institute of Technology, Pasadena, CA 91125, U.S.A.
3 Australia Telescope National Facility, CSIRO, Epping 2121, Australia
Send offprint request to: G.B. Taylor
Accepted: 30 March 1999
Once the afterglow from a GRB has been detected in the radio, Very Long Baseline Interferometry (VLBI) observations can provide a resolution of 1 milliarcsecond or better and absolute astrometry at a similar level. We will review the VLBI programs carried out to date which include observations of G970508, G980329, G980425, and G980703. All of these objects are found to be very compact (size mas) even months after the burst. This is consistent with the predictions of fireball models. Our ultimate goal is a direct measurement of the morphology and expansion of a GRB afterglow.
Key words: gamma-ray bursts / technique: interferometry astrometry
© European Southern Observatory (ESO), 1999