SIMBAD references

2011ApJ...727L..33G - Astrophys. J., 727, L33 (2011/February-1)

Detection of a thermal spectral component in the prompt emission of GRB 100724B.

GUIRIEC S., CONNAUGHTON V., BRIGGS M.S., BURGESS M., RYDE F., DAIGNE F., MESZAROS P., GOLDSTEIN A., McENERY J., OMODEI N., BHAT P.N., BISSALDI E., CAMERO-ARRANZ A., CHAPLIN V., DIEHL R., FISHMAN G., FOLEY S., GIBBY M., GILES M.M., GREINER J., GRUBER D., VON KIENLIN A., KIPPEN M., KOUVELIOTOU C., McBREEN S., MEEGAN C.A., PACIESAS W., PREECE R., RAU A., TIERNEY D., VAN DER HORST A.J. and WILSON-HODGE C.

Abstract (from CDS):

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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Journal keyword(s): acceleration of particles - gamma-ray burst: individual: GRB 1000724B (read: GRB 100724B) - gamma rays: stars - radiation mechanisms: non-thermal - radiation mechanisms: thermal

Simbad objects: 1

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