Vlbi and archival vla and wsrt observations of the grb030329 radio afterglow

Robert A. Mesler, Ylva M. Pihlström, Greg B. Taylor, Johnathan Granot

Research output: Contribution to journalArticlepeer-review


We present VLBI and archival Karl G. Jansky Very Large Array (VLA) and Westerbork Synthesis Radio Telescope (WSRT) observations of the radio afterglow from the gamma-ray burst (GRB) of 2003 March 29 (GRB030329) taken between 672 and 2032days after the burst. The VLA and WSRT data suggest a simple power-law decay in the flux at 5GHz, with no clear signature of any rebrightening from the counterjet. We report an unresolved source at day 2032 of size 1.18 ± 0.13 mas, which we use in conjunction with the expansion rate of the burst to argue for the presence of a uniform, interstellar-medium-like circumburst medium. A limit of <0.067 mas yr-1 is placed on the proper motion, supporting the standard afterglow model for gamma-ray bursts.

Original languageEnglish
Article number4
JournalAstrophysical Journal
Issue number1
StatePublished - 1 Nov 2012
Externally publishedYes


  • Gamma-ray burst: general
  • Gamma-ray burst: individual (GRB 030329)


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