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Photospheres in gamma ray bursts: Lessons learned from Fermi
KTH, School of Engineering Sciences (SCI), Physics.ORCID iD: 0000-0002-9769-8016
2012 (English)In: Proceedings of Science, Sissa Medialab Srl , 2012Conference paper, Published paper (Refereed)
Abstract [en]

I will summarise the main lessons learned from Fermi Gamma-ray Space Telescope observations regarding the behaviour of the photosphere. First, GRB090902B exhibited a clear and distinct component that is best attributed to the jet photosphere. Second, many GRBs have a "double hump" spectrum and a sole Band function cannot model their shapes. Third, Fermi confirms CGRO BATSE results on thermal emission in GRB pulses, its existence and temporal behaviour. Fourth, Fermi provides evidence for sub-photospheric energy dissipation, which can explain the non-thermal spectra seen in many bursts. Indeed, the inclusion of a photospheric emission component is the first step towards an understanding the physical origin of the prompt emission: The Band function does not provide it.

Place, publisher, year, edition, pages
Sissa Medialab Srl , 2012.
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-234075Scopus ID: 2-s2.0-85052406330OAI: oai:DiVA.org:kth-234075DiVA, id: diva2:1244627
Conference
2012 Gamma-Ray Bursts Conference, GRB 2012, Munich, Germany, 7 May 2012 through 11 May 2012
Note

QC 20180903

Available from: 2018-09-03 Created: 2018-09-03 Last updated: 2018-09-03Bibliographically approved

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