THE AFTERGLOW OF GAMMA-RAY BURSTS - THE CASES OF GRB-970228 AND GRB-970508

Authors
VIETRI M
Citation
M. Vietri, THE AFTERGLOW OF GAMMA-RAY BURSTS - THE CASES OF GRB-970228 AND GRB-970508, The Astrophysical journal, 488(2), 1997, pp. 105-108
Citations number
25
Categorie Soggetti
Astronomy & Astrophysics
Journal title
The Astrophysical journal → ACNP
ISSN journal
0004637X
Volume
488
Issue
2
Year of publication
1997
Part
2
Pages
105 - 108
Database
ISI
SICI code
0004-637X(1997)488:2<105:TAOGB->2.0.ZU;2-9
Abstract
Highly radiative expansion of a relativistic shell is shown to explain all observed features of the afterglows of the two bursts GRB 970228 and GRB 970508. In particular, in the first case the observed time dep endence proportional to t(-1.32) of the soft X-ray flux is easily repr oduced. The same model, when the surrounding matter density scales as r(-2), explains the afterglow of GRB 970508, which may at first sight appear at odds with that of GRB 970228. Quantitative agreement is also found with radio time delay and flux levels.