Detection of a spectral break in the extra hard component of GRB 090926A

Markus Ackermann; Marco Ajello; K. Asano; Magnus Axelsson; Luca Baldini; Jean Ballet; Guido Barbiellini; M. G. Baring; D. Bastieri; K. Bechtol; R. Bellazzini; B. Berenji; P. N. Bhat; E. Bissaldi; R. D. Blandford; E. Bonamente; A. W. Borgland; A. Bouvier; J. Bregeon; A. Brez; M. S. Briggs; M. Brigida; Pascal Bruel; R. Buehler; S. Buson; G. A. Caliandro; R. A. Cameron; P. A. Caraveo; S. Carrigan; J. M. Casandjian; C. Cecchi; Ö. Çelik; V. Chaplin; E. Charles; A. Chekhtman; J. Chiang; S. Ciprini; R. Claus; J. Cohen-Tanugi; V. Connaughton; J. Conrad; S. Cutini; C. D. Dermer; A. de Angelis; F. de Palma; B. L. Dingus; E. Do Couto E Silva; P. S. Drell; R. Dubois; C. Favuzzi; S. J. Fegan; E. C. Ferrara; W. B. Focke; M. Frailis; Y. Fukazawa; S. Funk; P. Fusco; F. Gargano; D. Gasparrini; N. Gehrels; S. Germani; N. Giglietto; F. Giordano; M. Giroletti; T. Glanzman; G. Godfrey; A. Goldstein; J. Granot; J. Greiner; I. A. Grenier; J. E. Grove; S. Guiriec; D. Hadasch; Y. Hanabata; A. K. Harding; K. Hayashi; M. Hayashida; E. Hays; D. Horan; R. E. Hughes; R. Itoh; G. Jóhannesson; A. S. Johnson; W. N. Johnson; T. Kamae; H. Katagiri; J. Kataoka; R. M. Kippen; Jürgen Knödlseder; D. Kocevski; C. Kouveliotou; M. Kuss; J. Lande; L. Latronico; S.-H. Lee; M. Llena Garde; F. Longo; F. Loparco; M. N. Lovellette; P. Lubrano; A. Makeev; M. N. Mazziotta; S. Mcbreen; J. E. Mcenery; S. Mcglynn; C. Meegan; J. Mehault; P. Mészáros; P. F. Michelson; T. Mizuno; C. Monte; M. E. Monzani; E. Moretti; A. Morselli; I. V. Moskalenko; S. Murgia; H. Nakajima; T. Nakamori; M. Naumann-Godo; S. Nishino; P. L. Nolan; J. P. Norris; E. Nuss; M. Ohno; T. Ohsugi; A. Okumura; N. Omodei; E. Orlando; J. F. Ormes; M. Ozaki; W. S. Paciesas; D. Paneque; J. H. Panetta; D. Parent; V. Pelassa; M. Pepe; M. Pesce-Rollins; V. Petrosian; F. Piron; T.A. Porter; R. Preece; J. L. Racusin; S. Rainò; R. Rando; A. Rau; M. Razzano; S. Razzaque; A. Reimer; O. Reimer; T. Reposeur; L. C. Reyes; J. Ripken; S. Ritz; M. Roth; F. Ryde; H. F.-W. Sadrozinski; A. Sander; J. D. Scargle; T. L. Schalk; C. Sgrò; E. J. Siskind; P. D. Smith; G. Spandre; P. Spinelli; M. Stamatikos; F. W. Stecker; M. S. Strickman; D. J. Suson; H. Tajima; H. Takahashi; T. Tanaka; Y. Tanaka; J. B. Thayer; J. G. Thayer; L. Tibaldo; D. Tierney; K. Toma; D. F. Torres; G. Tosti; A. Tramacere; Y. Uchiyama; T. Uehara; T. L. Usher; J. Vandenbroucke; A. J. van Der Horst; V. Vasileiou; N. Vilchez; V. Vitale; A. von Kienlin; A. P. Waite; P. Wang; C. Wilson-Hodge; B. L. Winer; K. S. Wood; X. F. Wu; R. Yamazaki; Z. Yang; T. Ylinen; M. Ziegler

doi:10.1088/0004-637X/729/2/114

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Detection of a spectral break in the extra hard component of GRB 090926A

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Detection of a spectral break in the extra hard component of GRB 090926A

Markus Ackermann, Marco Ajello, K. Asano, Magnus Axelsson, Luca Baldini, Jean Ballet, Guido Barbiellini, M. G. Baring, D. Bastieri, K. Bechtol, …

The Astrophysical Journal, Vol.729

10/03/2011

DOI: https://doi.org/10.1088/0004-637X/729/2/114

Abstract

gamma-ray burst: individual (GRB 090926A)

98.70.Rz &ggr;-ray sources; &ggr;-ray bursts 98.80.Es Observational cosmology (including Hubble constant, distance scale, cosmological constant, early Universe, etc) 95.85.Pw &ggr;-ray

We report on the observation of the bright, long gamma-ray burst, GRB 090926A, by the Gamma-ray Burst Monitor (GBM) and Large Area Telescope (LAT) instruments on board the \Fermi\ Gamma-ray Space Telescope. GRB 090926A shares several features with other bright LAT bursts. In particular, it clearly shows a short spike in the light curve that is present in all detectors that see the burst, and this in turn suggests that there is a common region of emission across the entire \Fermi\ energy range. In addition, while a separate high-energy power-law component has already been observed in other GRBs, here we report for the first time the detection with good significance of a high-energy spectral break (or cutoff) in this power-law component around 1.4 GeV in the time-integrated spectrum. If the spectral break is caused by opacity to electron-positron pair production within the source, then this observation allows us to compute the bulk Lorentz factor for the outflow, rather than a lower limit.

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Title: Detection of a spectral break in the extra hard component of GRB 090926A
Creators - without role: Markus Ackermann - Kavli Institute for Particle Astrophysics and Cosmology
Marco Ajello - Kavli Institute for Particle Astrophysics and Cosmology
K. Asano - Tokyo Institute of Technology
Magnus Axelsson - Fraunhofer Chalmers Research Centre for Industrial Mathematics
Luca Baldini - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
Jean Ballet - Astrophysique, Instrumentation et Modélisation
Guido Barbiellini - University of Trieste
M. G. Baring
D. Bastieri - University of Padua
K. Bechtol - Kavli Institute for Particle Astrophysics and Cosmology
R. Bellazzini - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
B. Berenji - Kavli Institute for Particle Astrophysics and Cosmology
P. N. Bhat
E. Bissaldi - Max Planck Institute for Extraterrestrial Physics
R. D. Blandford
E. Bonamente - University of Perugia
A. W. Borgland
A. Bouvier - Kavli Institute for Particle Astrophysics and Cosmology
J. Bregeon - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
A. Brez - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
M. S. Briggs
M. Brigida - Polytechnic University of Bari
Pascal Bruel - École Polytechnique
R. Buehler - Kavli Institute for Particle Astrophysics and Cosmology
S. Buson - University of Padua
G. A. Caliandro
R. A. Cameron
P. A. Caraveo - Istituto di Astrofisica Spaziale e Fisica Cosmica di Milano
S. Carrigan - University of Padua
J. M. Casandjian - Astrophysique Interprétation Modélisation
C. Cecchi - Istituto Nazionale di Fisica Nucleare, Sezione di Perugia
Ö. Çelik - Goddard Space Flight Center
V. Chaplin - University of Alabama in Huntsville
E. Charles - Kavli Institute for Particle Astrophysics and Cosmology
A. Chekhtman - United States Naval Research Laboratory
J. Chiang - Kavli Institute for Particle Astrophysics and Cosmology
S. Ciprini - University of Perugia
R. Claus - Kavli Institute for Particle Astrophysics and Cosmology
J. Cohen-Tanugi - Laboratoire de Physique Théorique
V. Connaughton - University of Alabama in Huntsville
J. Conrad - Stockholm University
S. Cutini - Agenzia Spaziale Italiana
C. D. Dermer
A. de Angelis - Istituto Nazionale di Fisica Nucleare, Sezione di Trieste
F. de Palma - Istituto Nazionale di Fisica Nucleare, Sezione di Bari
B. L. Dingus
E. Do Couto E Silva
P. S. Drell
R. Dubois - Kavli Institute for Particle Astrophysics and Cosmology
C. Favuzzi - Istituto Nazionale di Fisica Nucleare, Sezione di Bari
S. J. Fegan - Laboratoire Leprince-Ringuet
E. C. Ferrara
W. B. Focke
M. Frailis - Istituto Nazionale di Fisica Nucleare, Sezione di Trieste
Y. Fukazawa - Hiroshima University
S. Funk - Kavli Institute for Particle Astrophysics and Cosmology
P. Fusco - Istituto Nazionale di Fisica Nucleare, Sezione di 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
F. Giordano - Polytechnic University of Bari
M. Giroletti - Istituto di Radioastronomia di Bologna
T. Glanzman - Kavli Institute for Particle Astrophysics and Cosmology
G. Godfrey - Kavli Institute for Particle Astrophysics and Cosmology
A. Goldstein - University of Alabama in Huntsville
J. Granot - University of Hertfordshire
J. Greiner - Max Planck Institute for Extraterrestrial Physics
I. A. Grenier - Astrophysique Interprétation Modélisation
J. E. Grove
S. Guiriec - University of Alabama in Huntsville
D. Hadasch - Institute of Space Sciences
Y. Hanabata - Hiroshima University
A. K. Harding
K. Hayashi - Hiroshima University
M. Hayashida - Kavli Institute for Particle Astrophysics and Cosmology
E. Hays - Goddard Space Flight Center
D. Horan - Laboratoire Leprince-Ringuet
R. E. Hughes
R. Itoh - Hiroshima University
G. Jóhannesson - Kavli Institute for Particle Astrophysics and Cosmology
A. S. Johnson
W. N. Johnson
T. Kamae - Kavli Institute for Particle Astrophysics and Cosmology
H. Katagiri - Hiroshima University
J. Kataoka - Waseda University
R. M. Kippen
Jürgen Knödlseder - Centre National de la Recherche Scientifique
D. Kocevski - Stanford University
C. Kouveliotou - Marshall Space Flight Center
M. Kuss - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
J. Lande - Kavli Institute for Particle Astrophysics and Cosmology
L. Latronico - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
S.-H. Lee - Kavli Institute for Particle Astrophysics and Cosmology
M. Llena Garde
F. Longo - University of Trieste
F. Loparco - Istituto Nazionale di Fisica Nucleare, Sezione di Bari
M. N. Lovellette
P. Lubrano - Istituto Nazionale di Fisica Nucleare, Sezione di Perugia
A. Makeev - United States Naval Research Laboratory
M. N. Mazziotta
S. Mcbreen - Max Planck Institute for Extraterrestrial Physics
J. E. Mcenery
S. Mcglynn - KTH Royal Institute of Technology
C. Meegan - Universities Space Research Association
J. Mehault - Institut National de Physique Nucléaire et de Physique des Particules
P. Mészáros - Pennsylvania State University
P. F. Michelson
T. Mizuno - Hiroshima University
C. Monte - Polytechnic University of Bari
M. E. Monzani
E. Moretti - KTH Royal Institute of Technology
A. Morselli - Istituto Nazionale di Fisica Nucleare, Roma Tor Vergata
I. V. Moskalenko
S. Murgia - Kavli Institute for Particle Astrophysics and Cosmology
H. Nakajima - Tokyo Institute of Technology
T. Nakamori - Waseda University
M. Naumann-Godo - CEA Paris-Saclay
S. Nishino - Hiroshima University
P. L. Nolan
J. P. Norris
E. Nuss - Laboratoire de Physique Théorique
M. Ohno - Institute of Space and Astronautical Science
T. Ohsugi - Hiroshima University
A. Okumura - Institute of Space and Astronautical Science
N. Omodei - Kavli Institute for Particle Astrophysics and Cosmology
E. Orlando - Max Planck Institute for Extraterrestrial Physics
J. F. Ormes
M. Ozaki - Institute of Space and Astronautical Science
W. S. Paciesas
D. Paneque - Kavli Institute for Particle Astrophysics and Cosmology
J. H. Panetta
D. Parent - George Mason University
V. Pelassa - Institut National de Physique Nucléaire et de Physique des Particules
M. Pepe - University of Perugia
M. Pesce-Rollins - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
V. Petrosian - Stanford University
F. Piron - Institut National de Physique Nucléaire et de Physique des Particules
T.A. Porter - Kavli Institute for Particle Astrophysics and Cosmology
R. Preece - University of Alabama in Huntsville
J. L. Racusin
S. Rainò - Polytechnic University of Bari
R. Rando - University of Padua
A. Rau - Max Planck Institute for Extraterrestrial Physics
M. Razzano - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
S. Razzaque - United States Naval Research Laboratory
A. Reimer - Kavli Institute for Particle Astrophysics and Cosmology
O. Reimer - Kavli Institute for Particle Astrophysics and Cosmology
T. Reposeur - Laboratoire de Physique des deux infinis Bordeaux
L. C. Reyes
J. Ripken - AlbaNova
S. Ritz - University of California, Santa Cruz
M. Roth - University of Washington
F. Ryde - KTH Royal Institute of Technology
H. F.-W. Sadrozinski
A. Sander - The Ohio State University
J. D. Scargle
T. L. Schalk
C. Sgrò - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
E. J. Siskind
P. D. Smith
G. Spandre - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
P. Spinelli - Istituto Nazionale di Fisica Nucleare, Sezione di Bari
M. Stamatikos - Goddard Space Flight Center
F. W. Stecker
M. S. Strickman
D. J. Suson
H. Tajima - Kavli Institute for Particle Astrophysics and Cosmology
H. Takahashi - Hiroshima University
T. Tanaka - Kavli Institute for Particle Astrophysics and Cosmology
Y. Tanaka - Institute of Space and Astronautical Science
J. B. Thayer
J. G. Thayer
L. Tibaldo - University of Padua
D. Tierney - University College Dublin
K. Toma - Pennsylvania State University
D. F. Torres
G. Tosti - Istituto Nazionale di Fisica Nucleare, Sezione di Perugia
A. Tramacere - Consorzio Interuniversitario Fisica Spaziale
Y. Uchiyama - Kavli Institute for Particle Astrophysics and Cosmology
T. Uehara - Hiroshima University
T. L. Usher
J. Vandenbroucke - Kavli Institute for Particle Astrophysics and Cosmology
A. J. van Der Horst
V. Vasileiou - Goddard Space Flight Center
N. Vilchez - Université Toulouse III - Paul Sabatier
V. Vitale - University of Rome Tor Vergata
A. von Kienlin - Max Planck Institute for Extraterrestrial Physics
A. P. Waite
P. Wang - SLAC National Accelerator Laboratory
C. Wilson-Hodge - Marshall Space Flight Center
B. L. Winer
K. S. Wood
X. F. Wu
R. Yamazaki - Aoyama Gakuin University
Z. Yang - AlbaNova
T. Ylinen - Fraunhofer Chalmers Research Centre for Industrial Mathematics
M. Ziegler - University of California, Santa Cruz
Publication Details: The Astrophysical Journal, Vol.729
Identifiers: 9934372509311
Academic Unit: Université de Montpellier
Language: English
Resource Type: Journal article
Local Fields: in2p3-00587734