Astronomy and Astrophysics – Astrophysics
Scientific paper
May 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aipc..836..436h&link_type=abstract
GAMMA-RAY BURSTS IN THE SWIFT ERA: Sixteenth Maryland Astrophysics Conference. AIP Conference Proceedings, Volume 836, pp. 436-
Astronomy and Astrophysics
Astrophysics
Gamma-Ray Sources, Gamma-Ray Bursts
Scientific paper
The Swift observatory discovered and observed GRB 050525A. The X-ray and optical/ultraviolet afterglow decay curves exhibit an achromatic break approximately 0.15 days after the burst. This break, and the total gamma-ray energy of the burst, implies a jet opening angle of 2.°5. Prior to the break the X-ray spectrum can be modelled by a power law with βX = -1.2. A short X-ray flare occurred 300 s after the burst. The optical/ultraviolet data have a complex decay, with evidence of a reverse shock dominating in the first few minutes and a forward shock dominating at later times. The X-ray/ultraviolet/optical spectrum suggests that a cooling break moved through the optical between 800 and 25 000 s after the burst. The temporal decay and spectral indices agree with the standard fireball model, assuming a uniform interstellar medium.
Holland Stephen T.
Swift Science Team
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