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Astronomy and Astrophysics | 2002

The WEBT BL Lacertae Campaign 2000

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 | 1999

The 65 Day Period in 3C 66A during Bright State

Markku Lainela; L. Takalo; A. Sillanpää; Tapio Pursimo; K. Nilsson; S. Katajainen; G. Tosti; Massimo Fiorucci; M. Luciani; M. Villata; C. M. Raiteri; G. de Francesco; G. Sobrito; E. Benítez; D. Dultzin-Hacyan; J. A. de Diego; George W. Turner; J. W. Robertson; R. K. Honeycutt

1\rm\,mag


The Astrophysical Journal | 2003

Coordinated Multiwavelength Observations of BL Lacertae in 2000

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

brightening in a few weeks. Both the time duration (about


The Astrophysical Journal | 1998

A Comparative Study of the Microvariability Properties in Radio-loud and Radio-quiet Quasars

J. A. de Diego; D. Dultzin-Hacyan; A. Ramirez; E. Benítez

100\rm\,d


The Astrophysical Journal | 2005

Coordinated Multiwavelength Observation of 3C 66A during the WEBT Campaign of 2003-2004*

M. Böttcher; J. Harvey; M. Joshi; M. Villata; C. M. Raiteri; D. Bramel; R. Mukherjee; T. Savolainen; W. Cui; Giovanni Fossati; I. A. Smith; D. Able; Hugh D. Aller; Margo F. Aller; A. A. Arkharov; T. Augusteijn; Kiran S. Baliyan; David A. Barnaby; A. Berdyugin; E. Benítez; P. Boltwood; Michael T. Carini; D. Carosati; S. Ciprini; J. M. Coloma; S. Crapanzano; J. A. de Diego; A. Di Paola; M. Dolci; J.-H. Fan

) and the variation amplitude (roughly


Astronomy and Astrophysics | 2014

A trio of gamma-ray burst supernovae: - GRB 120729A, GRB 130215A/SN 2013ez, and GRB 130831A/SN 2013fu

Z. Cano; A. de Ugarte Postigo; Alexei S. Pozanenko; N. Butler; C. C. Thöne; C. Guidorzi; T. Krühler; Javier Gorosabel; P. Jakobsson; G. Leloudas; Daniele Malesani; J. Hjorth; A. Melandri; Carole G. Mundell; K. Wiersema; P. D’Avanzo; S. Schulze; Andreja Gomboc; A. Johansson; W. Zheng; D. A. Kann; F. Knust; K. Varela; C. Akerlof; J. S. Bloom; O. Burkhonov; E. Cooke; J. A. de Diego; G. Dhungana; C. Fariña

0.9\rm\,mag


Astronomy and Astrophysics | 2004

Optical variability of PKS 0736+017

A. Ramirez; J. A. de Diego; D. Dultzin-Hacyan; J. N. González-Pérez

) 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


The Astronomical Journal | 1992

Near infrared monitoring of a sample of blazars with the Carlos Sanchez Telescope. I

L. Takalo; M. Kidger; J. A. de Diego; A. Sillanpää; Kim K. Nilsson

7\rm\,h


The Astronomical Journal | 2009

MULTIBAND COMPARATIVE STUDY OF OPTICAL MICROVARIABILITY IN RADIO-LOUD VERSUS RADIO-QUIET QUASARS

A. Ramirez; J. A. de Diego; D. Dultzin; J. N. González-Pérez

was detected on August 8–9, 2000, immediately followed by a ~


The Astrophysical Journal | 2003

A Multiwavelength Study of Narrow-Line Seyfert 1 Galaxies from the Second Byurakan Survey

J. A. Stepanian; E. Benítez; Y. Krongold; Irene Cruz-Gonzalez; J. A. de Diego; V. Chavushyan; R. Mújica; D. Dultzin-Hacyan; T. Verdugo

0.4 \rm \, mag

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M. Kidger

European Space Agency

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E. Benítez

National Autonomous University of Mexico

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Kim K. Nilsson

University of Copenhagen

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Leo O. Takalo

Special Astrophysical Observatory

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D. Dultzin-Hacyan

National Autonomous University of Mexico

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J. J. González

National Autonomous University of Mexico

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Jose Nicolas Gonzalez-Perez

Spanish National Research Council

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Tim Mahoney

Spanish National Research Council

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