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The afterglow onset for GRB060418 and GRB060607A
Covino S., Vergani S.D., Malesani D., Molinari E., D'Avanzo P. et al
Dans Chinese Journal of Astronomy and Astrophysics - Frascati Workshop 2007: Multifrequency Behaviour of High Energy Cosmic Sources, Vulcano : Italie (2007) - http://hal.in2p3.fr/in2p3-00193761
Physique/Astrophysique/Cosmologie et astrophysique extra-galactique
Planète et Univers/Astrophysique/Cosmologie et astrophysique extra-galactique
Planète et Univers/Astrophysique
The afterglow onset for GRB060418 and GRB060607A
S. Covino, S.D. Vergani, D. Malesani, E. Molinari, P. D'Avanzo, G. Chincarini, F.M. Zerbi, L.A. Antonelli, P. Conconi, V. Testa, G. Tosti, F. Vitali, F. D'Alessio, G. Malaspina, L. Nicastro, E. Palazzi, D. Guetta, S. Campana, P. Goldoni1, 2, N. Masetti, E.J.A. Meurs, Alessandro Monfardini ()3, L. Norci, E. Pian, S. Piranomonte, D. Rizzuto, M. Stefanon, L. Stella, G. Tagliaferri, P. A. Ward, G. Ihle, L. Gonzalez, A. Pizarro, P. Sinclair, J. Valenzuela
1 :  APC - UMR 7164 - AstroParticule et Cosmologie
http://www.apc.univ-paris7.fr/
CNRS : UMR7164 – IN2P3 – Observatoire de Paris – Université Paris VII - Paris Diderot – CEA : DSM/IRFU
APC - UMR 7164, Université Paris Diderot, 10 rue Alice Domon et Léonie Duquet, case postale 7020, F-75205 Paris Cedex 13
France
2 :  DAPNIA - Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée
CEA : DSM/DAPNIA
France
3 :  NEEL - Institut Néel
http://www.neel.cnrs.fr/
CNRS : UPR2940 – Université Joseph Fourier - Grenoble I – Institut National Polytechnique de Grenoble (INPG)
25 avenue des Martyrs - BP 166 38042 GRENOBLE CEDEX 9
France
APC - AHE
HELFA
Gamma-ray burst are thought to be produced by highly relativistic outflows. Although upper and lower limits for the outflow initial Lorentz factor γ_0 are available, observational efforts to derive a direct determination of γ_0 have so far failed or provided ambiguous results. As a matter of fact, the shape of the early-time afterglow light curve is strongly sensitive on γ_0 which determines the time of the afterglow peak, i.e. when the outflow and the shocked circumburst material share a comparable amount of energy. We now comment early-time observations of the near-infrared afterglows of GRB 060418 and GRB 060607A performed by the REM robotic telescope. For both events, the afterglow peak was singled out and allowed us to determine the initial fireball Lorentz, γ_0~400.

Communications avec actes
10/2008
05/2007
Chinese Journal of Astronomy and Astrophysics
internationale
8
356-360

Frascati Workshop 2007: Multifrequency Behaviour of High Energy Cosmic Sources
Vulcano
Italie
28/05/2007
02/06/2007

Lien vers le texte intégral : 
http://fr.arXiv.org/abs/0710.0727