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Effects of Compton scattering on the Gamma Ray Spectra of Solar flares
Jun'ichi Kotoku, Kazuo Makishima, Yukari Matsumoto +3
Using fully relativistic GEANT4 simulation tool kit, the transport of energetic electrons generated in solar flares was Monte-Carlo simulated, and resultant bremsstrahlung gamma-ra…
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…
The radiant of the Leonids meteor storm in 2001
Ken'ichi Torii, Mitsuhiro Kohama, Toshifumi Yanagisawa +1
We have measured the radiant of the Leonids meteor storm in November 2001 by using new observational and analysis techniques. The radiant was measured as the intersections of lines…
Discovery of a Dwarf Nova Breaking the Standard Sequence of Compact Binary Evolution
M. Uemura, T. Kato, R. Ishioka +1
We revealed that the dwarf nova 1RXS J232953.9+062814 is an SU UMa-type system with a superhump period of 66.774+/-0.010 min. The short period strongly indicates that the orbital p…