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The unprecedented optical outburst of the quasar 3C 454.3. The WEBT campaign of 2004-2005
M. Villata, C. M. Raiteri, T. J. Balonek
The radio quasar 3C 454.3 underwent an exceptional optical outburst lasting more than 1 year and culminating in spring 2005. The maximum brightness detected was R = 12.0, which rep…
TV Corvi Revisited: Precursor and Superhump Period Derivative Linked to the Disk Instability Model
M. Uemura, R. E. Mennickent, R. Ishioka +9
We report optical photometric observations of four superoutbursts of the short-period dwarf nova TV Crv. This object experiences two types of superoutbursts; one with a precursor a…
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…
The Earliest Optical Observations of GRB 030329
K. Torii, T. Kato, H. Yamaoka +9
We present the earliest optical imaging observations of GRB 030329 related to SN 2003dh. The burst was detected by the HETE-2 satellite at 2003 March 29, 11:37:14.67 UT. Our wide-f…
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…
The Electron Spectrum in 3C279 and the Observed Emission Spectrum
Masaaki Kusunose, Fumio Takahara, Tomohiro Kato
The emission mechanisms of the blazar 3C 279 are studied by solving the kinetic equations of electrons and photons in a relativistically moving blob. The gamma-ray spectral energy…