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Title: An achromatic break in the afterglow of the short GRB 140903A: evidence for a narrow jet
Authors: Troja, E.
Sakamoto, T.
Cenko, S. B.
Lien, A.
Gehrels, N.
Castro-Tirado, A. J.
Ricci, R.
Capone, J.
Toy, V.
Kutyrev, A.
Kawai, N.
Cucchiara, A.
Fruchter, A.
Gorosabel, J.
Jeong, S.
Levan, A.
Perley, D.
Sanchez-Ramirez, R.
Tanvir, Nial
Veilleux, S.
First Published: 2016
Publisher: IOP Publishing for American Astronomical Society
Citation: 2016, Astrophysical Journal Supplement, accepted in press
Abstract: We report the results of our observing campaign on GRB140903A, a nearby (z=0.351) short duration (T90~0.3 s) gamma-ray burst discovered by Swift. We monitored the X-ray afterglow with Chandra up to 21 days after the burst, and detected a steeper decay of the X-ray flux after approximately 1 day. Continued monitoring at optical and radio wavelengths showed a similar decay in flux at nearly the same time, and we interpret it as evidence of a narrowly collimated jet. By using the standard fireball model to describe the afterglow evolution, we derive a jet opening angle of 5 deg and a collimation-corrected total energy release of 2E50 erg. We further discuss the nature of the GRB progenitor system. Three main lines disfavor a massive star progenitor: the properties of the prompt gamma-ray emission, the age and low star-formation rate of the host galaxy, and the lack of a bright supernova. We conclude that this event was likely originated by a compact binary merger.
ISSN: 0067-0049
eISSN: 1538-4365
Version: Post-print
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © American Astronomical Society 2016. This article is distributed under the terms of the Creative Commons Attribution-Non Commercial-No Derivatives License ( ), which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.
Description: 12 pages, 7 figures, submitted to ApJ
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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