Bibcode
Raiteri, C. M.; Villata, M.; Kurtanidze, O. M.; Nikolashvili, M. G.; Ibrahimov, M. A.; Papadakis, I. E.; Tsinganos, K.; Sadakane, K.; Okada, N.; Takalo, L. O.; Sillanpaa, A.; Tosti, G.; Ciprini, S.; Frasca, A.; Marilli, E.; Robb, R. M.; Noble, J. C.; Jorstad, S. G.; Hagen-Thorn, V. A.; Larionov, V. M.; Sclavi, S.; Nesci, R.; Schwartz, R. D.; Basler, J.; Gorham, P. W.; Iwamatsu, H.; Kato, T.; Pullen, C.; Benitez, E.; de Diego, J. A.; Moilanen, M.; Oksanen, A.; Rodriguez, D.; Sadun, A. C.; Kelly, M.; Carini, M. T.; Miller, H. R.; Catalano, S.; Dultzin-Hacyan, D.; Fan, J. H.; Ishioka, R.; Karttunen, H.; Keinanen, P.; Kudryavtseva, N. A.; Lainela, M.; Lanteri, L.; Larionova, E. G.; Maesano, M.; Matsumoto, K.; Mattox, J. R.; Montagni, F.; Nucciarelli, G.; Ostorero, L.; Papamastorakis, J.; Pasanen, M.; Sobrito, G.; Uemura, M.; D'Alessio, F.
Bibliographical reference
Blazar Astrophysics with BeppoSAX and Other Observatories, Proceedings of the international workshop, December 10-11, 2001, ASI Science Data Center, ESA-ESRIN, Frascati, Italy. Edited by Paolo Giommi, Enrico Massaro, Giorgio Palumbo. ESA-ESRIN, 2002. p. 219.
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2002
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Description
We present R-band light curves of BL Lacertae from May 2000 to January
2001, obtained by 22 telescopes in 11 countries. More than 15000 UBVRI
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 details. Two different phases can be
distinguished in the light curve: a first, relatively low-brightness
phase is followed by an outburst phase, after a more than 1 mag
brightening in a couple of weeks. Both the time duration (about 100 d)
and the variation amplitude (roughly 0.9 mag) 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 7h was detected on August 8-9, 2000,
immediately followed by an about 0.4 mag brightening in 1.7h.