Multi-Color Observations of the GRB000926 Afterglow

Details Multi-Color Observations of the GRB000926 Afterglow Multi-Color Observations of the GRB000926 Afterglow

2000-12-13

arxiv.org/abs/astro-ph/0012303v2

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures, 2 tables. Accepted for publication in ApJ Letters

Scientific paper

10.1086/319152

We present multi-color light-curves of the optical afterglow of GRB 000926. Beginning ~1.5 days after the burst, the light-curves of this GRB steepen measurably. The existence of such achromatic breaks are usually taken to be an important observational signature that the ejecta are not expanding isotropically, but rather have a collimated jet-like geometry. If we interpret the data in this context, we derive an opening angle of 5 degrees, which reduces the energy release compared to an isotropic model by a factor of ~275, to 1.7 x 10^51 erg. To fit the data with a simple jet model requires extinction along the line of sight. The derived A_V is in the range 0.11 - 0.82 mag, depending on the adopted extinction law and whether the electrons giving rise to the optical emission are undergoing synchrotron cooling or not. Since this is in excess of the expected extinction from our Galaxy, we attribute this to the GRB host. We note that this extinction is typical of a galactic disk, and therefore the event likely took place in the disk of its host.

Affiliated with

Also associated with

No associations

Rating

Multi-Color Observations of the GRB000926 Afterglow 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 Multi-Color Observations of the GRB000926 Afterglow, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Multi-Color Observations of the GRB000926 Afterglow will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-59244