Journal
ASTROPHYSICAL JOURNAL
Volume 827, Issue 2, Pages -Publisher
IOP Publishing Ltd
DOI: 10.3847/0004-637X/827/2/102
Keywords
gamma-ray burst: individual (GRB 140903A); X-rays: bursts
Categories
Funding
- National Aeronautics and Space Administration through Chandra Awards [GO4-15072A, GO4-15067A]
- National Aeronautics Space Administration [NAS8-03060]
- Discovery Communications
- National Science Foundation [AST-1005313]
- Spanish Ministry Projects [AYA2012-39727-C03-01, 2015-71718R]
- Science and Technology Facilities Council [ST/L000733/1, ST/M000966/1] Funding Source: researchfish
- STFC [ST/N001524/1, ST/L000733/1, ST/L001306/1, ST/N000757/1] Funding Source: UKRI
- Grants-in-Aid for Scientific Research [24103002, 24103001] Funding Source: KAKEN
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [1207785] Funding Source: National Science Foundation
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We report the results of our observing campaign on GRB. 140903A, a nearby (z = 0.351) short-duration (T-90 similar to 0.3 s) gamma-ray burst discovered by Swift. We monitored the X-ray afterglow with Chandra up to 15 days after the burst. and detected a steeper decay of the X-ray flux after t(j) approximate to 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 theta(j) approximate to 5 degrees and a collimation-corrected total energy release E approximate to 2 x 10(50) 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. likely originated from a compact binary merger.
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