Optical Afterglow Observations of the Unusual Short-Duration Gamma-Ray Burst 040924
Astrophysics, abstract
astro-ph/0506232
From: Yuji Urata [view email]
Date: Fri, 10 Jun 2005 12:26:53 GMT (328kb)
Optical Afterglow Observations of the Unusual Short-Duration Gamma-Ray
Burst 040924
Authors:
K. Y. Huang,
Y. Urata,
A. V. Filippenko,
J. H. Hu,
W. H. Ip,
P. H. Kuo,
W. Li,
H. C. Lin,
Z. Y. Lin,
K. Makishima,
K. Onda,
Y. Qiu,
T. Tamagawa
Comments: 13 pages, 3 figures, accepted for publication in ApJL
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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