Volume 454, Number 3, August II 2006
|Page(s)||L119 - L122|
|Published online||17 July 2006|
Letter to the Editor
The bright optical flash from GRB 060117
Instituto de Astrofísica de Andalucía (IAA-CSIC), Apartado de Correos, 3.004, 18080 Granada, Spain e-mail: firstname.lastname@example.org
2 Fyzikální ústav AV ČR, Na Slovance 2, 182 21 Praha 8, Czech Republic
3 For the Pierre Auger Collaboration
4 Astronomický ústav AV ČR, Fričova 298, 251 65 Ondřejov, Czech Republic
5 INTEGRAL Science Data Centre, Ch. d'Ecogia 16, 1290 Versoix, Switzerland
6 Ústav částicové a jaderné fyziky, MFF UK Praha, V Holešovičkách 2, 180 00 Praha 8, Czech Republic
Accepted: 30 May 2006
We present a discovery and observation of an extraordinarily bright prompt optical emission of the GRB 060117 obtained by a wide-field camera atop the robotic telescope FRAM of the Pierre Auger Observatory from 2 to 10 min after the GRB. We found rapid average temporal flux decay of and a peak brightness mag. Later observations by other instruments set a strong limit on the optical and radio transient fluxes, unveiling an unexpectedly rapid further decay. We present an interpretation featuring a relatively steep electron-distribution parameter and providing a straightforward solution for the overall fast decay of this optical transient as a transition between reverse and forward shock.
Key words: gamma-rays: bursts
© ESO, 2006
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