The bright optical flash from GRB 060117
M. JelínekInstituto de Astrofísica de Andalucía (IAA-CSIC), Apartado de Correos, 3.004, 18080 Granada, Spain e-mail: [email protected]M. ProuzaFor the Pierre Auger CollaborationP. KubánekAstronomický ústav AV ČR, Fričova 298, 251 65 Ondřejov, Czech RepublicR. HudecAstronomický ústav AV ČR, Fričova 298, 251 65 Ondřejov, Czech RepublicMartin NekolaAstronomický ústav AV ČR, Fričova 298, 251 65 Ondřejov, Czech RepublicJ. ŘídkýFor the Pierre Auger CollaborationJ. GrygarFor the Pierre Auger CollaborationM. BoháčováFor the Pierre Auger CollaborationA. J. Castro‐TiradoInstituto de Astrofísica de Andalucía (IAA-CSIC), Apartado de Correos, 3.004, 18080 Granada, Spain e-mail: [email protected]J. GorosabelInstituto de Astrofísica de Andalucía (IAA-CSIC), Apartado de Correos, 3.004, 18080 Granada, Spain e-mail: [email protected]M. HrabovskýFor the Pierre Auger CollaborationDušan MandátFor the Pierre Auger CollaborationDalibor NosekL. NožkaFor the Pierre Auger CollaborationM. PalatkaFor the Pierre Auger CollaborationS. B. PandeyInstituto de Astrofísica de Andalucía (IAA-CSIC), Apartado de Correos, 3.004, 18080 Granada, Spain e-mail: [email protected]M. PechFor the Pierre Auger CollaborationPetr SchovánekFor the Pierre Auger CollaborationRadomir ŠmídaFor the Pierre Auger CollaborationP. Trávnı́čekFor the Pierre Auger CollaborationA. de Ugarte PostigoInstituto de Astrofísica de Andalucía (IAA-CSIC), Apartado de Correos, 3.004, 18080 Granada, Spain e-mail: [email protected]S. VítekInstituto de Astrofísica de Andalucía (IAA-CSIC), Apartado de Correos, 3.004, 18080 Granada, Spain e-mail: [email protected]
2006en
ABI
Abstract
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.
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Cited by 60 references