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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:||Astrophysical Journal Supplement, 2016, 827(2)|
|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 © 2016, IOP Publishing for The American Astronomical Society. Deposited with reference to the publisher’s open access archiving policy.|
|Appears in Collections:||Published Articles, Dept. of Physics and Astronomy|
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|Troja_2016_ApJ_827_102.pdf||Published (publisher PDF)||3.13 MB||Adobe PDF||View/Open|
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