First hours of the GRB 030329 optical afterglow

We present the first results of the observations of the extremely bright optical afterglow of gamma-ray burst (GRB) 030329 with the 1.5m Russian-Turkish telescope RTT150 (TUBITAK National Observatory, Bakyrlytepe, Turkey). RTT150 was one of the first 1.5m-class telescopes pointed to the afterglow. Observations were started approximately 6 hours after the burst. During the first 5 hours of our observations the afterglow faded exactly as a power law with index -1.19+-0.01 in each of the BVRI Bessel filters. After that, in all BVRI filters simultaneously we observe a steepening of the power law light curve. The power law decay index smoothly approaches the value ~= -1.9, observed by other observatories later. This power law break occurs at t-t_0 =0.57 days and lasts for +-0.1 days. We observe no variability above the gradual fading with the upper limits 10--1% on time scales 0.1--1000s. Spectral flux distribution in four BVRI filters corresponds to the power law spectrum with spectral index \alpha=0.66+-0.01. The change of the power law decay index in the end of our observations can be interpreted as a signature of collimated ultrarelativistic jet. The afterglow flux distribution in radio, optical and x-rays is consistent with synchrotron spectrum. We continue our observations of this unique object with RTT150.Comment: Astronomy Letters, Vol. 29, No. 9, p. 573; 6 pages, 5 figures; pagination corrected; the original Russian version can be found at http://hea.iki.rssi.ru/~br/030329/pfh030329.pd

The Tendency To Have Psychogenic Non-Epileptic Attacks Out Of Camera View During Long-Term Video-Eeg Monitoring

The aim of this study was to compare out of camera view seizure occurrence rates between psychogenic non-epileptic and epileptic seizures during long-term video-EEG monitoring. From 1996 to 2001, 208 adult patients were monitored in 212 sessions, and 196 patients were included in the study. Depending on video-EEG recordings and witnessed accounts, 18 of the patients had no seizures recorded, 160 had epileptic seizures and 18 had psychogenic non-epileptic seizures, four of whom had psychogenic non-epileptic seizures plus true epileptic seizures. Six hundred and ninety two seizures were recorded; 634 of them were epileptic seizures and 58 of them, psychogenic non-epileptic ones. Out of camera attack occurrence was significantly higher in patients with psychogenic non-epileptic attacks compared with epileptic ones (chi-square with Yates correction 19.75, df = 1, P < 0.001). (C) 2002 Published by Elsevier Science Ltd on behalf of BEA Trading Ltd.WoSScopu

Epileptic Nystagmus In A Patient With Nonconvulsive Status Epilepticus

Epileptic nystagmus (EN) is a rare form of rhythmic eye oscillations Occurring during seizure activity. Not only convulsive states, but also nonconvulsive status may represent with EN and this phenomenon may be the only motor manifestation of seizure activity. Epileptic activation of a cortical saccade region may be distinguished from activation of a cortical put-suit region clinically as activation of pursuit regions results in nystagmus slow phases that bring the eyes across the midline. Horizontal EN results most commonly from seizure activity involving the occipital cortex. In this report, horizontal EN in a patient with nonconvulsive status epilepticus (NCSE) is described with clinical, radiological and electrophysiological findings that occur probably due to posterior leukoencephalopathy syndrome. (C) 2003 BEA Trading Ltd. Published by Elsevier Science Ltd. All rights reserved.WoSScopu