Jiřı́ Grygar

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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 minutes after the GRB. We found rapid average temporal flux decay of α = −1.7±0.1 and a peak brightness R = 10.1 mag. Later observations by(More)
Available optical andUV spectroscopic, HST and radio imaging observations of the Nova V 1974 Cygni were used to derive a kinematic model of the expansion of the nova shell. The nova shell consists of two major components: an outer fast tenuous low-mass envelope and an inner slow main high-mass envelope. The outer envelope, detected spectroscopically and on(More)
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