@article{a3731ab668ab43ce962187748ca7ec1b,
title = "Optical afterglow observations of the unusual short-duration gamma-ray burst GRB 040924",
abstract = "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 α = -1.07 (at t = 16-50 minutes) and α = -1.06 (at later times). The rather small difference in the spectral indices can be explained more easily by an afterglow model invoking a cooling break than by one with a jet break.",
keywords = "Gamma rays: bursts",
author = "Huang, {K. Y.} and Y. Urata and Filippenko, {A. V.} and Hu, {J. H.} and Ip, {W. H.} and Kuo, {P. H.} and W. Li and Lin, {H. C.} and Lin, {Z. Y.} and K. Makishima and K. Onda and Y. Qlu and T. Tamagawa",
note = "Funding Information: We thank the staff and observers at the Lulin telescope for various arrangements that made possible the observations reported herein. This work is supported by grants NSC 93-2752-M-008-001-PAE and NSC 93-2112-M-008-006. Y. U. acknowledges support from the Japan Society for the Promotion of Science through a JSPS Research Fellowship for Young Scientists. A. V. F. is grateful for NSF grant AST 03-07894 and for a Miller Research Professorship at UC Berkeley during which part of this work was completed. KAIT was made possible by generous donations from Sun Microsystems, Inc., the Hewlett-Packard Company, AutoScope Corporation, Lick Observatory, the NSF, the University of California, and the Sylvia and Jim Katzman Foundation.",
year = "2005",
month = aug,
day = "1",
doi = "10.1086/432612",
language = "???core.languages.en_GB???",
volume = "628",
pages = "L93--L96",
journal = "Astrophysical Journal",
issn = "0004-637X",
number = "2 II",
}