TY - JOUR
T1 - Detection of a thermal spectral component in the prompt emission of GRB 100724B
AU - Guiriec, Sylvain
AU - Connaughton, Valerie
AU - Briggs, Michael S.
AU - Burgess, Michael
AU - Ryde, Felix
AU - Daigne, Frédéric
AU - Mészáros, Peter
AU - Goldstein, Adam
AU - McEnery, Julie
AU - Omodei, Nicola
AU - Bhat, P. N.
AU - Bissaldi, Elisabetta
AU - Camero-Arranz, Ascensión
AU - Chaplin, Vandiver
AU - Diehl, Roland
AU - Fishman, Gerald
AU - Foley, Suzanne
AU - Gibby, Melissa
AU - Giles, Misty M.
AU - Greiner, Jochen
AU - Gruber, David
AU - Von Kienlin, Andreas
AU - Kippen, Marc
AU - Kouveliotou, Chryssa
AU - McBreen, Sheila
AU - Meegan, Charles A.
AU - Paciesas, William
AU - Preece, Robert
AU - Rau, Arne
AU - Tierney, Dave
AU - Van Der Horst, Alexander J.
AU - Wilson-Hodge, Colleen
N1 - Funding Information:
A.J.v.d.H. was supported by an appointment to the NASA Postdoctoral Program at the MSFC, administered by Oak Ridge Associated Universities through a contract with NASA. S.F. acknowledges the support of the Irish Research Council for Science, Engineering and Technology, cofunded by Marie Curie Actions under FP7. P.M. acknowledges the support of NASA NNX08AL40G. F.R. acknowledges the support of the Swedish National Space Board.
Funding Information:
The GBM project is supported by the German Bundesministerium für Wirtschaft und Technologie (BMWi) via the Deutsches Zentrum für Luft-und Raumfahrt (DLR) under the contract numbers 50 QV 0301 and 50 OG 0502.
PY - 2011/2/1
Y1 - 2011/2/1
N2 - 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.
AB - 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.
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U2 - 10.1088/2041-8205/727/2/L33
DO - 10.1088/2041-8205/727/2/L33
M3 - Article
AN - SCOPUS:79960270885
SN - 2041-8205
VL - 727
JO - Astrophysical Journal Letters
JF - Astrophysical Journal Letters
IS - 2 PART II
ER -