Stirring the Embers: High Sensitivity VLBI Observations of GRB030329

Details Stirring the Embers: High Sensitivity VLBI Observations of GRB030329 Stirring the Embers: High Sensitivity VLBI Observations of GRB030329

2007-04-17

arxiv.org/abs/0704.2085v1

Astrophys.J.664:411-415,2007

Astronomy and Astrophysics

Astrophysics

16 pages, 5 figures, accepted for publication in Astrophysical Journal

Scientific paper

10.1086/518955

We present high sensitivity Very Long Baseline Interferometry (VLBI) observations 806 days after the gamma-ray burst of 2003 March 29 (GRB030329). 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 GRB030329 (z = 0.1685). The evolution of the image size favors a uniform external density over an R^-2 wind-like density profile (at distances of R >~10^18 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 non-relativistic transition time of t_NR ~ 1 yr. A rebrightening, or at least a significant flattening in the flux decay, is expected within the next several years as the counter-jet becomes visible (this has not yet been observed). An upper limit of <1.9c is set on the proper motion of the flux centroid.

Affiliated with

Also associated with

No associations

Rating

Stirring the Embers: High Sensitivity VLBI Observations of GRB030329 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Stirring the Embers: High Sensitivity VLBI Observations of GRB030329, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Stirring the Embers: High Sensitivity VLBI Observations of GRB030329 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-233350