VLBA observations of the radio counterparts to γ-ray bursters

Details VLBA observations of the radio counterparts to γ-ray bursters VLBA observations of the radio counterparts to γ-ray bursters

May 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aipc..428..571t&link_type=abstract

Fourth Huntsville gamma-ray burst symposium. AIP Conference Proceedings, Volume 428, pp. 571-575 (1998).

Mathematics

Logic

2

Unidentified Sources Of Radiation Outside The Solar System, Observational Cosmology, Radio, Microwave

Scientific paper

The detection of a radio counterpart to GRB970508 by Frail et al. [6] opens the way to applying the powerful technique of Very Long Baseline Interferometry to this intriguing class of objects. We demonstrate the applicability of this technique to GRB970508. Using the Very Long Baseline Array (VLBA), including the phased VLA and the 100-m radiotelescope at Bonn, we were able to image the radio counterpart of GRB970508 at a resolution of 1 mas. This 8.4 GHz image revealed GRB970508 to be very compact (less than 400 micro-arcsecond in angular size). We present the results from an ongoing VLBA monitoring campaign of GRB970508 that commenced 8 days after the initial gamma-ray burst and is still underway 120 days after the burst. We derive a position for the radio counterpart with a standard deviation of 73 micro-arcsecond, and will discuss the limits on proper motions and source expansion obtained so far. Assuming that the radio emission arises from the afterglow of a cosmological fireball, VLBI observations of GRB970508 and future GRBs offer a reasonable hope of directly measuring the expansion.

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