Optical and Radio Observations of the Afterglow from GRB990510: Evidence for a Jet

Details Optical and Radio Observations of the Afterglow from GRB990510: Evidence for a Jet Optical and Radio Observations of the Afterglow from GRB990510: Evidence for a Jet

1999-05-25

arxiv.org/abs/astro-ph/9905306v4

Astrophys.J.523:L121-L124,1999

Astronomy and Astrophysics

Astrophysics

12 pages, 2 figures. Version accepted for publication in ApJ Letters

Scientific paper

10.1086/312282

We present multi-color optical and two-frequency radio observations of the bright SAX event, GRB 990510. The well-sampled optical decay, together with the radio observations are inconsistent with simple spherical afterglow models. The achromatic optical steepening and the decay of the radio afterglow both occuring at $t \sim 1$ day are evidence for hydrodynamical evolution of the source, and can be most easily interpreted by models where the GRB ejecta are collimated in a jet. Employing a simple jet model to interpret the observations, we derive a jet opening angle of $\theta_o = 0.08$, reducing the isotropic gamma-ray emission of $2.9 \times 10^{53}$ erg by a factor $\sim 300$. If the jet interpretation is correct, we conclude that GRB observations to-date are consistent with an energy for the central source of $E \lsim 10^{52}$ erg.

Affiliated with

Also associated with

No associations

Rating

Optical and Radio Observations of the Afterglow from GRB990510: Evidence for a Jet 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 Optical and Radio Observations of the Afterglow from GRB990510: Evidence for a Jet, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical and Radio Observations of the Afterglow from GRB990510: Evidence for a Jet will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-218600