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Detection of Thermal Spectral components in the Prompt Emission of GRBs
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2011 (English)In: AIP Conference Proceedings: Volume 1358, 2011, Vol. 1358, 33-36 p.Conference paper (Other academic)
Abstract [en]

Observations of GRB 100724B with the Fermi Gamma-Ray Burst Monitor (GBM) find that the spectrum is dominated by the typical Band functional form, which is usually taken to represent a non-thermal emission component, but also includes a statistically highly significant thermal spectral contribution [14]. The simultaneous observation of the thermal and non-thermal components allows us to confidently identify the two emission components. The fact that these seem to vary independently favors the idea that the thermal component is of photospheric origin while the dominant non-thermal emission occurs at larger radii. Our results imply either a very high efficiency for the non-thermal process, or a very small size of the region at the base of the flow, both quite challenging for the standard fireball model. These problems are resolved if the jet is initially highly magnetized and has a substantial Poynting flux.

Place, publisher, year, edition, pages
2011. Vol. 1358, 33-36 p.
, American Institute of Physics Conference Series
Keyword [en]
gamma-rays, photosphere, acceleration, relativity, gamma-ray, Stellar atmospheres ; radiative transfer; opacity and line formation, Particle acceleration, Relativity and gravitation
National Category
Astronomy, Astrophysics and Cosmology
URN: urn:nbn:se:kth:diva-81237DOI: 10.1063/1.3621732ISI: 000302963100008ScopusID: 2-s2.0-80052477171OAI: diva2:497412
Gamma Ray Bursts 2010, GRB 2010, Annapolis, MD, 1-4 November, 2010
QC 20120214Available from: 2012-02-10 Created: 2012-02-10 Last updated: 2012-02-14Bibliographically approved

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