Swift Panchromatic Observations of the Bright Gamma-Ray Burst GRB 050525A

Details Swift Panchromatic Observations of the Bright Gamma-Ray Burst GRB 050525A Swift Panchromatic Observations of the Bright Gamma-Ray Burst GRB 050525A

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aas...20715806h&link_type=abstract

American Astronomical Society Meeting 207, #158.06; Bulletin of the American Astronomical Society, Vol. 37, p.1419

Astronomy and Astrophysics

Astronomy

Scientific paper

The bright gamma-ray burst GRB 050525A was observed with the Swift observatory, providing unique multiwavelength coverage from the very earliest phases of the burst. The X-ray and optical/ultraviolet afterglow decay light curves exhibit an achromatic break approximately 0.15 days after the burst. The timing of this break, combined with the total gamma-ray energy of the burst, constrains the opening angle of the jet to be 2.5 degrees. Prior to the jet break the X-ray data can be modelled by a power law with an index of α = -1.2. There is a short X-ray flare at 300 s after the burst. The optical/ultraviolet data have a complex decay, with evidence of a rapidly falling reverse shock component that dominates in the first minute and a flatter forward shock at later times. The multiwavelength X-ray/ultraviolet/optical spectrum of the afterglow shows evidence for a cooling break moving through the optical between 800 and 25 000 s after the burst. The measured temporal decay and spectral indices in the X-ray and optical/ultraviolet regimes agree with the standard fireball model for gamma-ray bursts, assuming expansion into a constant density interstellar medium.
The Swift programme is supported by NASA, PPARC, and ASI (contract number I/R/039/04).

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