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ABSTRACT We report the results of a worldwide campaign to observe WZ Sagittae during its 2001 superoutburst. After a 23 yr slumber at \documentclass{aastex} \usepackage{amsbsy} \usepackage{amsfonts}Expand
The Afterglows of Swift-era Gamma-ray Bursts. I. Comparing pre-Swift and Swift-era Long/Soft (Type II) GRB Optical Afterglows
The first indications of a class of long GRBs are presented, which form a bridge between the typical high-luminosity, high-redshift events and nearby low- luminosity events (which are also associated with spectroscopic supernovae) in terms of energetics and observed redshift distribution, indicating a continuous distribution overall. Expand
Optical studies of V404 Cyg, the X-Ray transient GS 2023 + 338 – III. The secondary star and accretion disc
We present new results from the analysis of 55 high-resolution spectra of V404 Cyg (the optical counterpart of the X-ray transient GS 2023+338) taken in 1991 July-August which, added to our 1990 JulyExpand
Superhumps in Cataclysmic Binaries. XXIV. Twenty More Dwarf Novae
We report precise measures of the orbital and superhump period in 20 more dwarf novae. For 10 stars, we report new and confirmed spectroscopic periods—signifying the orbital period —as well as the P o
Repetitive patterns in rapid optical variations in the nearby black-hole binary V404 Cygni
The data show that optical oscillations on timescales of 100 seconds to 2.5 hours can occur at mass-accretion rates more than ten times lower than previously thought, suggesting that the accretion rate is not the critical parameter for inducing inner-disk instabilities. Expand
SN 2003du: 480 days in the life of a normal type Ia supernova
Aims. We present a study of the optical and near-infrared (NIR) properties of the Type Ia Supernova (SN Ia) 2003du. Methods. An extensive set of optical and NIR photometry and low-resolutionExpand
Survey of period variations of superhumps in SU UMa-type dwarf novae. VII. The seventh year (2014-2015)
Continuing the project described by Kato et al. (2009, PASJ, 61, S395), we collected times of superhump maxima for 102 SU UMa-type dwarf novae, observed mainly during the 2014-2015 season, andExpand
Survey of Period Variations of Superhumps in SU UMa-Type Dwarf Novae. III. The Third Year (2010–2011)
Continuing the project described by Kato et al. (2009, PASJ 61, S395, arXiv:0905.1757), we collected times of superhump maxima for 51 SU UMa-type dwarf novae mainly observed during the 2010-2011Expand