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Early Optical Observations of Gamma-Ray Bursts by the TAROT Telescopes: Period 2001-2008

Klotz, A.; Gendre, B.; Atteia, J. L. +1 more

The Télescopes à Action Rapide pour les Objets Transitoires telescopes are two robotic observatories designed to observe the prompt optical emission counterpart and the early afterglow of gamma-ray bursts (GRBs). We present data acquired between 2001 and 2008 and discuss the properties of the optical emission of GRBs, noting various interesting re…

A Catalog of Visual Double and Multiple Stars With Eclipsing Components

Wolf, M.; Gazeas, K.; Liakos, A. +4 more

A new catalog of visual double systems containing eclipsing binaries as one component is presented. The main purpose of this catalog is to compile a complete list of all known multiples of this variety, both for current analysis and to highlight those in need of additional observations. All available photometric and astrometric data were analyzed,…

Accretion Properties of a Sample of Hard X-Ray (<60 keV) Selected Seyfert 1 Galaxies

Wang, J.; Wei, J. Y.; Mao, Y. F.

We examine the accretion properties in a sample of 42 hard (3-60 keV) X-ray selected nearby broad-line active galactic nuclei (AGNs). The energy range in the sample is harder than that usually used in similar previous studies. These AGNs are mainly complied from the RXTE All Sky Survey, and complemented by the released INTEGRAL AGN catalog. The bl…

A Study of the Low-Mass X-Ray Binary Dip Sources XB 1916 - 053, XB 1323 - 619, X 1624 - 490 and 4U 1746 - 371 Observed with INTEGRAL

Balman, Ş.

We detect dipping activity/modulations in the light curve of the four low-mass X-ray binaries in the 3-10 keV and 20-40 keV energy ranges. The spectral parameters derived from the fits to the International Gamma-Ray Astrophysics Laboratory data are consistent with hot coronal structures in these systems where we find a range of plasma temperatures…