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The Infrared Counterpart of the X-Ray Nova XTE J1720-318
Tetsuya Nagata, Daisuke Kato, Daisuke Baba +15
We report on the discovery of an infrared counterpart to the X-ray transient XTE J1720-318 on 2003 January 18, nine days after an X-ray outburst, and the infrared light curve durin…
Photometric study of southern SU UMa-type dwarf novae and candidates -- III: NSV 10934, MM Sco, AB Nor, CAL 86
T. Kato, P. Nelson, C. Stockdale +6
We photometrically observed four southern dwarf novae in outburst (NSV 10934, MM Sco, AB Nor and CAL 86). NSV 10934 was confirmed to be an SU UMa-type dwarf nova with a mean superh…
Superhumps in Cataclysmic Binaries. XXIV. Twenty More Dwarf Novae
J. Patterson, J. Thorstensen, J. Kemp +23
We report precise measures of the orbital and superhump period in twenty more dwarf novae. For ten stars, we report new and confirmed spectroscopic periods - signifying the orbital…
Outburst and Post-Outburst Active Phase of the Black Hole X-ray Binary V4641 Sgr in 2002
M. Uemura, T. Kato, R. Ishioka +19
The black hole X-ray binary V4641 Sgr experienced an outburst in 2002 May which was detected at X-ray, optical, and radio wavelengths. The outburst lasted for only 6 days, but the…
V803 Centauri: Helium Dwarf Nova Mimicking a WZ Sge-Type Superoutburst
T. Kato, R. Stubbings, B. Monard +3
We observed long-term behavior of the helium dwarf nova V803 Cen, and clarified the existence of at least two distinct states (state with 77-d supercycles and standstill-like state…
Structure in the early afterglow lightcurve of the gamma-ray burst of 29 March 2003
Makoto Uemura, Taichi Kato, Ryoko Ishioka +6
Gamma-ray bursts (GRBs) are energetic explosions that for 0.01--100 s are the brightest gamma-ray sources in the sky. Observations of the early evolution of afterglows we expected…