The optical variability of the quasar 3C345 over a timespan of 3,965 d (1965-1976) is examined. The light curve has been analyzed quantitatively using a procedure suggested by Deeming (1975) for the Fourier analysis of unequally spaced data. The power spectrum shows three peaks with periods of 1540, 800 and 140 d. A harmonic solution which reproduces the complex maxima and single burst with fair accuracy has been obtained
Abstract. We present and discuss polarimetric observations performed with the VLT-UT3 (Melipal) on the afterglow of GRB 011211, ∼35 hours after the burst onset. The observations yielded a 3 σ upper limit of P < 2.7%. We discuss this result in combination with the lightcurve evolution, that may show a break approximately at the time of our observation. We show that our upper limit is consistent with the currently favored beamed fireball geometry, especially if the line of sight was not too close to the edge of the cone.
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