A decade ago the archetypal Seyfert-1 galaxy NGC 5548 was discovered to have undergone major spectral changes. The soft X-ray flux had dropped by a factor of 30 while new broad and blueshifted UV absorption lines appeared. This explained emergence obscuring wind from accretion disk. Here we report on striking long-term variability disk in including observations taken 2021-2022 with Swift Observ...

ABSTRACT We present the results of an extensive analysis optical, ultraviolet, X-ray, and γ-ray data collected from observations BL Lac objects prototype Lacertae carried out over a period nearly 13 yr, between 2008 August 2021 March. The source is characterized by strongly variable emission at all frequencies, often accompanied spectral changes. In band several prominent flares have been detec...

This article explores the use of the postrotary nystagmus (PRN) test for children younger than current norms (children 4.0 yr-8.11 yr). In the first study, 37 children ages 4-9 yr were examined in the standard testing position and in an adult-held adapted position to determine whether holding a child affected the reflex. Because the position did not affect the reflex, in the second study, PRN i...