GRB110721A: An extreme peak energy and signatures of the photosphere

Magnus Axelsson; Luca Baldini; Guido Barbiellini; M. G. Baring; R. Bellazzini; J. Bregeon; M. Brigida; Pascal 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

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

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GRB110721A: An extreme peak energy and signatures of the photosphere

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GRB110721A: An extreme peak energy and signatures of the photosphere

Magnus Axelsson, Luca Baldini, Guido Barbiellini, M. G. Baring, R. Bellazzini, J. Bregeon, M. Brigida, Pascal Bruel, R. Buehler, G. A. Caliandro, …

The Astrophysical Journal Letters, Vol.757

2012

DOI: https://doi.org/10.1088/2041-8205/757/2/L31

Abstract

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.

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Title: GRB110721A: An extreme peak energy and signatures of the photosphere
Creators - without role: Magnus Axelsson - Fraunhofer Chalmers Research Centre for Industrial Mathematics
Luca Baldini - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
Guido Barbiellini - University of Trieste
M. G. Baring
R. Bellazzini - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
J. Bregeon - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
M. Brigida - Polytechnic University of Bari
Pascal Bruel - École Polytechnique
R. Buehler - SLAC National Accelerator Laboratory
G. A. Caliandro
R. A. Cameron
P. A. Caraveo - Istituto di Astrofisica Spaziale e Fisica Cosmica di Milano
C. Cecchi - University of Perugia
R.C.G. Chaves - Institut de Recherche sur les Lois Fondamentales de l'Univers
A. Chekhtman - George Mason University
J. Chiang - Kavli Institute for Particle Astrophysics and Cosmology
R. Claus - Kavli Institute for Particle Astrophysics and Cosmology
J. Conrad - Stockholm University
S. Cutini - Agenzia Spaziale Italiana
F. d'Ammando
F. de Palma - Istituto Nazionale di Fisica Nucleare, Sezione di Bari
C. D. Dermer
E. Do Couto E Silva
P. S. Drell
C. Favuzzi - Polytechnic University of Bari
S. J. Fegan - Laboratoire Leprince-Ringuet
E. C. Ferrara
W. B. Focke
Y. Fukazawa - Hiroshima University
P. Fusco - Polytechnic University of Bari
F. Gargano - Istituto Nazionale di Fisica Nucleare, Sezione di Bari
D. Gasparrini - Agenzia Spaziale Italiana
N. Gehrels - Goddard Space Flight Center
S. Germani - University of Perugia
N. Giglietto - Polytechnic University of Bari
M. Giroletti - Istituto di Radioastronomia di Bologna
G. Godfrey - Kavli Institute for Particle Astrophysics and Cosmology
S. Guiriec - Goddard Space Flight Center
D. Hadasch - Institute of Space Sciences
Y. Hanabata - Hiroshima University
M. Hayashida - SLAC National Accelerator Laboratory
X. Hou - Laboratoire de Physique des deux infinis Bordeaux
S. Iyyani - KTH Royal Institute of Technology
M. S. Jackson
D. Kocevski - Stanford University
M. Kuss - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
J. Larsson - Stockholm University
S. Larsson - Stockholm University
F. Longo - Istituto Nazionale di Fisica Nucleare, Sezione di Trieste
F. Loparco - Polytechnic University of Bari
C. Lundman - KTH Royal Institute of Technology
M. N. Mazziotta
J. E. Mcenery
T. Mizuno - Hiroshima University
M. E. Monzani
E. Moretti - KTH Royal Institute of Technology
A. Morselli - Istituto Nazionale di Fisica Nucleare, Roma Tor Vergata
S. Murgia - Kavli Institute for Particle Astrophysics and Cosmology
E. Nuss - Université de Montpellier, Laboratoire Univers et Particules de Montpellier - LUPM
T. Nymark - AlbaNova
M. Ohno - Institute of Space and Astronautical Science
N. Omodei - Kavli Institute for Particle Astrophysics and Cosmology
M. Pesce-Rollins - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
F. Piron - Université de Montpellier, Laboratoire Univers et Particules de Montpellier - LUPM
G. Pivato - University of Padua
J. L. Racusin
S. Rain'O
M. Razzano - University of California, Santa Cruz
S. Razzaque - George Mason University
A. Reimer - Kavli Institute for Particle Astrophysics and Cosmology
M. Roth - University of Washington
F. Ryde - KTH Royal Institute of Technology
D.A. Sanchez - Max Planck Institute for Nuclear Physics
C. Sgr'O
E. J. Siskind
G. Spandre - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
P. Spinelli - Polytechnic University of Bari
M. Stamatikos - The Ohio State University
L. Tibaldo - Istituto Nazionale di Fisica Nucleare, Sezione di Padova
M. Tinivella - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
T. L. Usher
J. Vandenbroucke - Stanford University
V. Vasileiou - Université de Montpellier, Laboratoire Univers et Particules de Montpellier - LUPM
G. Vianello - Kavli Institute for Particle Astrophysics and Cosmology
V. Vitale - University of Rome Tor Vergata
A. P. Waite
B. L. Winer
K. S. Wood
J. M. Burgess
P. N. Bhat
E. Bissaldi - Universität Innsbruck
M. S. Briggs
V. Connaughton - University of Alabama in Huntsville
G. Fishman - Marshall Space Flight Center
G. Fitzpatrick - University College Dublin
S. Foley - Max Planck Institute for Extraterrestrial Physics
D. Gruber - Max Planck Institute for Extraterrestrial Physics
R. M. Kippen
C. Kouveliotou - Marshall Space Flight Center
P. Jenke - Marshall Space Flight Center
S. Mcbreen - Max Planck Institute for Extraterrestrial Physics
S. Mcglynn - Excellence Cluster Universe
C. Meegan - Universities Space Research Association
W. S. Pacisas
V. Pelassa - Université de Montpellier, Laboratoire Univers et Particules de Montpellier - LUPM
R. Preece - University of Alabama in Huntsville
D. Tierney - University College Dublin
A. von Kienlin - Max Planck Institute for Extraterrestrial Physics
C. Wilson-Hodge - Marshall Space Flight Center
S. Xiong - University of Alabama in Huntsville
A. Pe'Er
Publication Details: The Astrophysical Journal Letters, Vol.757
Identifiers: 9939563209311
Academic Unit: Laboratoire Univers et Particules de Montpellier - LUPM
Language: English
Resource Type: Journal article
Local Fields: in2p3-00743070