Stirring the Embers: High-Sensitivity VLBI Observations of GRB 030329

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We present high-sensitivity Very Long Baseline Interferometry (VLBI) observations 806 days after the {gamma}-ray burst of 2003 March 29 (GRB 030329). The angular diameter of the radio afterglow is measured to be 0:347 {+-} 0:09 mas, corresponding to 0:99 {+-} 0:26 pc at the redshift of GRB 030329 (z = 0:1685). The evolution of the image size favors a uniform external density over an R{sup -2} windlike density profile (at distances of R {approx}> 10{sup 18} cm from the source), although the latter cannot be ruled out yet. The current apparent expansion velocity of the image size is only mildly ... continued below

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Pihlstrom, Y.M.; Taylor, G.B.; U., /New Mexico; Granot, J.; /KIPAC, Menlo Park; Doeleman, S. et al. September 24, 2007.

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We present high-sensitivity Very Long Baseline Interferometry (VLBI) observations 806 days after the {gamma}-ray burst of 2003 March 29 (GRB 030329). The angular diameter of the radio afterglow is measured to be 0:347 {+-} 0:09 mas, corresponding to 0:99 {+-} 0:26 pc at the redshift of GRB 030329 (z = 0:1685). The evolution of the image size favors a uniform external density over an R{sup -2} windlike density profile (at distances of R {approx}> 10{sup 18} cm from the source), although the latter cannot be ruled out yet. The current apparent expansion velocity of the image size is only mildly relativistic, suggesting a nonrelativistic transition time of tNR {approx} 1 yr. A rebrightening, or at least a significant flattening in the flux decay, is expected within the next several years as the counterjet becomes visible (this has not yet been observed). An upper limit of <1.9c is set on the proper motion of the flux centroid.

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  • Journal Name: Astrophys.J.664:411,2007; Journal Volume: 664

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  • Report No.: SLAC-PUB-12828
  • Grant Number: AC02-76SF00515
  • DOI: 10.1086/518955 | External Link
  • Office of Scientific & Technical Information Report Number: 916983
  • Archival Resource Key: ark:/67531/metadc888013

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  • September 24, 2007

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  • Sept. 22, 2016, 2:13 a.m.

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  • Dec. 7, 2016, 10:32 p.m.

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Pihlstrom, Y.M.; Taylor, G.B.; U., /New Mexico; Granot, J.; /KIPAC, Menlo Park; Doeleman, S. et al. Stirring the Embers: High-Sensitivity VLBI Observations of GRB 030329, article, September 24, 2007; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc888013/: accessed August 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.