Katsura Matsumoto
Osaka Kyoiku University
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Publication
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Astronomy and Astrophysics | 2002
M. Villata; C. M. Raiteri; Maria G. Nikolashvili; I. E. Papadakis; K. Tsinganos; Kozo Sadakane; S. Ciprini; A. Frasca; E. Marilli; R. Nesci; M. Maesano; Julian N. Basler; C. Pullen; J. A. de Diego; Marko Moilanen; Arto Oksanen; Dolores Rodriguez; M. A. Kelly; H. R. Miller; Santo Catalano; D. Dultzin-Hacyan; Hannu Karttunen; N. A. Kudryavtseva; Katsura Matsumoto; F. Montagni; G. Nucciarelli; Luisa Ostorero; J. Papamastorakis; M. Pasanen; G. Sobrito
We present UBVRI light curves of BL Lacertae from May 2000 to January 2001, obtained by 24 telescopes in 11 countries. More than 15 000 observations were performed in that period, which was the extension of the Whole Earth Blazar Telescope (WEBT) campaign originally planned for July–August 2000. The exceptional sampling reached allows one to follow the flux behaviour in fine detail. Two different phases can be distinguished in the light curves: a first, relatively low-brightness phase is followed by an outburst phase, after a more than
The Astrophysical Journal | 2000
Izumi Hachisu; Mariko Kato; Taichi Kato; Katsura Matsumoto
1\rm\,mag
Publications of the Astronomical Society of Japan | 2010
Taichi Kato; Hiroyuki Maehara; Makoto Uemura; Arne A. Henden; Enrique de Miguel; Ian Miller; Pavol A. Dubovsky; Igor Kudzej; Seiichiro Kiyota; Franz-Josef Hambsch; Kenji Tanabe; Kazuyoshi Imamura; Nanae Kunitomi; Ryosuke Takagi; Mikiha Nose; Hidehiko Akazawa; Gianluca Masi; Shinichi Nakagawa; Eriko Iino; Ryo Noguchi; Katsura Matsumoto; Daichi Fujii; Hiroshi Kobayashi; Kazuyuki Ogura; Sachi Ohtomo; Kousei Yamashita; Hirofumi Yanagisawa; Hiroshi Itoh; Greg Bolt; Berto Monard
brightening in a few weeks. Both the time duration (about
The Astrophysical Journal | 2003
M. Böttcher; Alan P. Marscher; M. Ravasio; M. Villata; C. M. Raiteri; Hugh D. Aller; Margo F. Aller; H. Teräsranta; O. Mang; G. Tagliaferri; F. Aharonian; H. Krawczynski; Omar M. Kurtanidze; M. G. Nikolashvili; M. Ibrahimov; I. E. Papadakis; K. Tsinganos; Kozo Sadakane; Norio Okada; L. Takalo; A. Sillanpää; G. Tosti; S. Ciprini; A. Frasca; E. Marilli; R. M. Robb; John C. Noble; S. G. Jorstad; Vladimir A. Hagen-Thorn; V. M. Larionov
100\rm\,d
Nature | 2016
Mariko Kimura; Keisuke Isogai; Taichi Kato; Yoshihiro Ueda; Satoshi Nakahira; Megumi Shidatsu; Teruaki Enoto; Takafumi Hori; Daisaku Nogami; Colin Littlefield; Ryoko Ishioka; Ying-Tung Chen; S.-K. King; Chih Yi Wen; Shiang-Yu Wang; M. J. Lehner; Megan E. Schwamb; Jen Hung Wang; Z.-W. Zhang; Charles Alcock; Tim Axelrod; Federica B. Bianco; Yong Ik Byun; W. P. Chen; Kem H. Cook; Dae-Won Kim; Typhoon Lee; S. L. Marshall; Elena P. Pavlenko; Oksana I. Antonyuk
) and the variation amplitude (roughly
The Astrophysical Journal | 2000
Izumi Hachisu; Mariko Kato; Taichi Kato; Katsura Matsumoto; K. Nomoto
0.9\rm\,mag
Publications of the Astronomical Society of Japan | 2013
Taichi Kato; Franz-Josef Hambsch; Hiroyuki Maehara; Gianluca Masi; Ian Miller; Ryo Noguchi; Chihiro Aakasaka; Tomoya Aoki; Hiroshi Kobayashi; Katsura Matsumoto; Shinichi Nakagawa; Takuma Nakazato; Takashi Nomoto; Kazuyuki Ogura; Rikako Ono; Keisuke Taniuchi; William Stein; Arne A. Henden; Enrique de Miguel; Seiichiro Kiyota; Pavol A. Dubovsky; Igor Kudzej; Kazuyoshi Imamura; Hidehiko Akazawa; Ryosuke Takagi; Yuya Wakabayashi; Minako Ogi; Kenji Tanabe; Joseph Ulowetz; Etienne Morelle
) are similar in the two phases. Rapid flux oscillations are present all the time, involving variations up to a few tenths of mag on hour time scales, and witnessing an intense intraday activity of this source. In particular, a half-mag brightness decrease in about
Publications of the Astronomical Society of Japan | 2012
Taichi Kato; Hiroyuki Maehara; Ian Miller; Tomohito Ohshima; Enrique de Miguel; Kenji Tanabe; Kazuyoshi Imamura; Hidehiko Akazawa; Nanae Kunitomi; Ryosuke Takagi; Mikiha Nose; Franz-Josef Hambsch; Seiichiro Kiyota; Elena P. Pavlenko; Aleksei V. Baklanov; Oksana I. Antonyuk; Denis Samsonov; Aleksei A. Sosnovskij; Kirill A. Antonyuk; Maksim V. Andreev; Etienne Morelle; Pavol A. Dubovsky; Igor Kudzej; Arto Oksanen; Gianluca Masi; Thomas Krajci; Roger D. Pickard; Richard Sabo; Hiroshi Itoh; William Stein
7\rm\,h
Publications of the Astronomical Society of Japan | 2004
Taichi Kato; Daisaku Nogami; Katsura Matsumoto; Hajime Baba
was detected on August 8–9, 2000, immediately followed by a ~
The Astrophysical Journal | 2014
Koji S. Kawabata; Hiroshi Akitaya; Masayuki Yamanaka; R. Itoh; Keiichi Maeda; Yuki Moritani; Takahiro Ui; Miho Kawabata; Kensho Mori; Daisaku Nogami; K. Nomoto; Naotaka Suzuki; Katsutoshi Takaki; Masaomi Tanaka; Issei Ueno; Shingo Chiyonobu; Tatsuya Harao; Risako Matsui; Hisashi Miyamoto; Osamu Nagae; Asami Nakashima; Hidehiko Nakaya; Yuma Ohashi; T. Ohsugi; Tomoyuki Komatsu; Kiyoshi Sakimoto; Mahito Sasada; H. Sato; Hiroyuki Tanaka; Takeshi Urano
0.4 \rm \, mag
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