Optical Afterglow Observations of the Unusual Short-Duration Gamma-Ray Burst 040924

Details Optical Afterglow Observations of the Unusual Short-Duration Gamma-Ray Burst 040924 Optical Afterglow Observations of the Unusual Short-Duration Gamma-Ray Burst 040924

2005-06-10

arxiv.org/abs/astro-ph/0506232v1

Astrophys.J. 628 (2005) L93-L96

Astronomy and Astrophysics

Astrophysics

13 pages, 3 figures, accepted for publication in ApJL

Scientific paper

10.1086/432612

The 1-m telescope at Lulin Observatory and the 0.76-m Katzman Automatic Imaging Telescope at Lick Observatory were used to observe the optical afterglow of the short-duration (1.2--1.5 s) gamma-ray burst (GRB) 040924. This object has a soft high-energy spectrum, thus making it an exceptional case, perhaps actually belonging to the short-duration tail of the long-duration GRBs. Our data, combined with other reported measurements, show that the early R-band light curve can be described by two power laws with index alpha = -0.7 (at t = 16-50 min) and alpha = -1.06 (at later times). The rather small difference in the spectral indices can be more easily explained by an afterglow model invoking a cooling break rather than a jet break.

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