GRB110721A: An extreme peak energy and signatures of the photosphere

M. Axelsson; L. Baldini; G. Barbiellini; M. G. Baring; R. Bellazzini; J. Bregeon; M. Brigida; P. Bruel; R. Buehler; G. A. Caliandro; R. A. Cameron; P. A. Caraveo; C. Cecchi; R.C.G. Chaves; A. Chekhtman; J. Chiang; R. Claus; J. Conrad; S. Cutini; F. D'ammando; F. De Palma; C. D. Dermer; E. Do Couto E Silva; P. S. Drell; C. Favuzzi; S. J. Fegan; E. C. Ferrara; W. B. Focke; Y. Fukazawa; P. Fusco; F. Gargano; D. Gasparrini; N. Gehrels; S. Germani; N. Giglietto; M. Giroletti; G. Godfrey; S. Guiriec; D. Hadasch; Y. Hanabata; M. Hayashida; X. Hou; S. Iyyani; M. S. Jackson; D. Kocevski; M. Kuss; J. Larsson; S. Larsson; F. Longo; F. Loparco; C. Lundman; M. N. Mazziotta; J. E. Mcenery; T. Mizuno; M. E. Monzani; E. Moretti; A. Morselli; S. Murgia; E. Nuss; T. Nymark; M. Ohno; N. Omodei; M. Pesce-Rollins; F. Piron; G. Pivato; J. L. Racusin; S. Rain'o; M. Razzano; S. Razzaque; A. Reimer; M. Roth; F. Ryde; D.A. Sanchez; C. Sgr'o; E. J. Siskind; G. Spandre; P. Spinelli; M. Stamatikos; L. Tibaldo; M. Tinivella; T. L. Usher; J. Vandenbroucke; V. Vasileiou; G. Vianello; V. Vitale; A. P. Waite; B. L. Winer; K. S. Wood; J. M. Burgess; P. N. Bhat; E. Bissaldi; M. S. Briggs; V. Connaughton; G. Fishman; G. Fitzpatrick; S. Foley; D. Gruber; R. M. Kippen; C. Kouveliotou; P. Jenke; S. Mcbreen; S. Mcglynn; C. Meegan; W. S. Pacisas; V. Pelassa; R. Preece; D. Tierney; A. von Kienlin; C. Wilson-Hodge; S. Xiong; A. Pe'er

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DOI : 10.1088/2041-8205/757/2/L31

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Astrophysical Journal Letters 757 (2012) L31

GRB110721A: An extreme peak energy and signatures of the photosphere

M. Axelsson, L. Baldini, G. Barbiellini, M. G. Baring, R. Bellazzini, J. Bregeon, M. Brigida, P. Bruel¹, R. Buehler, G. A. Caliandro, R. A. Cameron, P. A. Caraveo, C. Cecchi, R.C.G. Chaves², A. Chekhtman, J. Chiang, R. Claus, J. Conrad, S. Cutini, F. D'ammando, F. De Palma, C. D. Dermer, E. Do Couto E Silva, P. S. Drell, C. Favuzzi, S. J. Fegan¹, E. C. Ferrara, W. B. Focke, Y. Fukazawa, P. Fusco, F. Gargano, D. Gasparrini, N. Gehrels, S. Germani, N. Giglietto, M. Giroletti, G. Godfrey, S. Guiriec, D. Hadasch, Y. Hanabata, M. Hayashida, X. Hou³, S. Iyyani, M. S. Jackson, D. Kocevski, M. Kuss, J. Larsson, S. Larsson, F. Longo, F. Loparco, C. Lundman, M. N. Mazziotta, J. E. Mcenery, T. Mizuno, M. E. Monzani, E. Moretti, A. Morselli, S. Murgia, E. Nuss⁴, T. Nymark, M. Ohno, N. Omodei, M. Pesce-Rollins, F. Piron⁴, G. Pivato, J. L. Racusin, S. Rain'o, M. Razzano, S. Razzaque, A. Reimer, M. Roth, F. Ryde, D.A. Sanchez, C. Sgr'o, E. J. Siskind, G. Spandre, P. Spinelli, M. Stamatikos, L. Tibaldo, M. Tinivella, T. L. Usher, J. Vandenbroucke, V. Vasileiou⁴, G. Vianello, V. Vitale, A. P. Waite, B. L. Winer, K. S. Wood, J. M. Burgess, P. N. Bhat, E. Bissaldi, M. S. Briggs, V. Connaughton, G. Fishman, G. Fitzpatrick, S. Foley, D. Gruber, R. M. Kippen, C. Kouveliotou, P. Jenke, S. Mcbreen, S. Mcglynn, C. Meegan, W. S. Pacisas, V. Pelassa⁴, R. Preece, D. Tierney, A. von Kienlin, C. Wilson-Hodge, S. Xiong, A. Pe'er

(2012)

GRB110721A was observed by the Fermi Gamma-ray Space Telescope using its two instruments the Large Area Telescope (LAT) and the Gamma-ray Burst Monitor (GBM). The burst consisted of one major emission episode which lasted for ~24.5 seconds (in the GBM) and had a peak flux of 5.7\pm0.2 x 10^{-5} erg/s/cm^2. The time-resolved emission spectrum is best modeled with a combination of a Band function and a blackbody spectrum. The peak energy of the Band component was initially 15\pm2 MeV, which is the highest value ever detected in a GRB. This measurement was made possible by combining GBM/BGO data with LAT Low Energy Events to achieve continuous 10--100 MeV coverage. The peak energy later decreased as a power law in time with an index of -1.89\pm0.10. The temperature of the blackbody component also decreased, starting from ~80 keV, and the decay showed a significant break after ~2 seconds. The spectrum provides strong constraints on the standard synchrotron model, indicating that alternative mechanisms may give rise to the emission at these energies.

1 :	LLR - Laboratoire Leprince-Ringuet

2 :	Max-Planck-Institut für Kernphysik

3 :	CENBG - Centre d'Etudes Nucléaires de Bordeaux Gradignan

4 :	LUPM - Laboratoire Univers et Particules de Montpellier

équipe(s) de recherche : GLAST

Thème(s)

Physique/Astrophysique/Phénomènes cosmiques de haute energie

Planète et Univers/Astrophysique/Phénomènes cosmiques de haute energie


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Soumis le : Jeudi 18 Octobre 2012, 09:15:24
Dernière modification le : Jeudi 18 Octobre 2012, 11:37:01