Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-10-05
Astronomy and Astrophysics
Astrophysics
7 pages, including 1 figure. Submitted to ApJ Letters
Scientific paper
10.1086/318063
In this paper I put forward a model in which GRB980425 is both associated with SN1998bw and is also a standard canonical (long; ~seconds) gamma-ray burst. Herein it is argued that if gamma-ray bursts are relativistic jets with the fastest moving material at the core, then the range of observed jet inclinations to the line-of-sight produces a range in the observed properties of GRBs, i.e. the lag-luminosity relationship. In particular, if the jet inclination is high enough, the observed emitter will move slowly enough to render relativistic beaming ineffective, thus distinguishing the jet from apparent isotropic emission. Thus we expect a break in the lag-luminosity relationship. I propose that GRB980425 defines that break. The position of this break gives important physical parameters such as the Lorentz factor (\gamma_max ~ 1000), the jet opening angle (~1 degree), and thus the beaming fraction (~10^-4). Estimates of burst rates are consistent with observation. If correct, this model is evidence in favor of the collapsar mode as the progenitor of cosmological, long gamma-ray bursts.
No associations
LandOfFree
On the Kinematics of GRB980425 and its association with SN1998bw 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 On the Kinematics of GRB980425 and its association with SN1998bw, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and On the Kinematics of GRB980425 and its association with SN1998bw will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-300068