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|Title:||An achromatic break in the afterglow of the short GRB 140903A: evidence for a narrow jet|
Cenko, S. B.
Castro-Tirado, A. J.
|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.|
|Rights:||Copyright © American Astronomical Society 2016. This article is distributed under the terms of the Creative Commons Attribution-Non Commercial-No Derivatives License (http://creativecommons.org/licenses/by-nc-nd/4.0/ ), 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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|1605.03573v1.pdf||Post-review (final submitted)||908.37 kB||Adobe PDF||View/Open|
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