Position and parallax of the γ-ray burst of 8 May 1997

Details Position and parallax of the γ-ray burst of 8 May 1997 Position and parallax of the γ-ray burst of 8 May 1997

Sep 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997natur.389..263t&link_type=abstract

Nature, Volume 389, Issue 6648, pp. 263-265 (1997).

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Scientific paper

γ-ray bursts (GRBs) have puzzled astronomers for almost three decades, primarily owing to the lack of identifications at other wavelengths. The detection of a radio counterpart enables application of the powerful technique of very long baseline interferometry (VLBI) to this intriguing class of objects. Here we present VLBI monitoring of VLA J065349.4 + 791619 obtained between 8 and 25 days after the initial γ-ray burst. The radio emission is found to be very compact, with an angular extent of less than 1 milliarcsecond. We derive a position for the radio counterpart accurate to 200 microarcseconds, and constrain the proper motion of VLA J065349.4 + 791619 be less than 50 milliarcseconds per year. We place an upper limit on the annual parallax of 1 milliarcsecond. These results are entirely consistent with the expectations of cosmological models.

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