The Angular Size and Proper Motion of the Afterglow of GRB 030329
作者： G. B. Taylor , D. A. Frail , E. Berger , S. R. Kulkarni
DOI: 10.1086/422554
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摘要: The bright, nearby (z = 0.1685) gamma-ray burst (GRB) of 2003 March 29 has presented us with the first opportunity to directly image expansion a GRB. This reached flux density levels at centimeter wavelengths more than 50 times brighter any previously studied event. Here we present results VLBI campaign using Very Long Baseline Array, Large Green Bank, Effelsberg, Arecibo, and Westerbork telescopes that resolves radio afterglow GRB 030329 constrains its rate expansion. size is found be ~0.07 mas (0.2 pc) 25 days after 0.17 (0.5 83 burst, indicating an average velocity 3c-5c. consistent expectations standard fireball model. We measure projected proper motion in sky less 0.3 80 following burst. In observations taken 52 detect additional compact component distance from main 0.28 ± 0.05 (0.80 pc). presence this not expected
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