Detection of a Thermal Spectral Component in the Prompt Emission of GRB 100724B - Archive ouverte HAL Access content directly
Journal Articles The Astrophysical Journal Letters Year : 2011

Detection of a Thermal Spectral Component in the Prompt Emission of GRB 100724B

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Sylvain Guiriec
  • Function : Author
Valerie Connaughton
  • Function : Author
Michael S. Briggs
  • Function : Author
Michael Burgess
  • Function : Author
Felix Ryde
  • Function : Author
Peter Mészáros
  • Function : Author
Adam Goldstein
  • Function : Author
Julie Mcenery
  • Function : Author
Nicola Omodei
  • Function : Author
P. N. Bhat
  • Function : Author
Elisabetta Bissaldi
  • Function : Author
Ascensión Camero-Arranz
  • Function : Author
Vandiver Chaplin
  • Function : Author
Roland Diehl
  • Function : Author
Gerald Fishman
  • Function : Author
Suzanne Foley
  • Function : Author
Melissa Gibby
  • Function : Author
Misty M. Giles
  • Function : Author
Jochen Greiner
  • Function : Author
David Gruber
  • Function : Author
Andreas von Kienlin
  • Function : Author
Marc Kippen
  • Function : Author
Chryssa Kouveliotou
  • Function : Author
Sheila Mcbreen
  • Function : Author
Charles A. Meegan
  • Function : Author
William Paciesas
  • Function : Author
Robert Preece
  • Function : Author
Arne Rau
  • Function : Author
Dave Tierney
  • Function : Author
Alexander J. van Der Horst
  • Function : Author
Colleen Wilson-Hodge
  • Function : Author

Abstract

Observations of GRB 100724B with the Fermi Gamma-Ray Burst Monitor 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. 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.

Dates and versions

insu-03646070 , version 1 (19-04-2022)

Identifiers

Cite

Sylvain Guiriec, Valerie Connaughton, Michael S. Briggs, Michael Burgess, Felix Ryde, et al.. Detection of a Thermal Spectral Component in the Prompt Emission of GRB 100724B. The Astrophysical Journal Letters, 2011, 727, ⟨10.1088/2041-8205/727/2/L33⟩. ⟨insu-03646070⟩
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