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Optical outburst and mm activity of 3C 345 observed by the GASP

ATel #2222; V. M. Larionov (Astronomical Institute, St.-Petersburg State University, Russia, and Pulkovo Observatory, Russia), M. Villata and C. M. Raiteri (INAF, Osservatorio Astronomico di Torino, Italy), D. Carosati (EPT Observatories, Tijarafe, La Palma, Spain), J. A. Ros (Agrupació Astronòmica de Sabadell, Spain), R. Casas (Institut de Ciències de l'Espai, Spain), O. Bravo and D. Melnichuk (Astronomical Institute, St.-Petersburg State University, Russia), and M. A. Gurwell (Harvard-Smithsonian Center for Astrophysics, MA, USA), for the GASP Collaboration
on 2 Oct 2009; 10:19 UT
Credential Certification: Claudia M. Raiteri (raiteri@oato.inaf.it)

Subjects: Millimeter, Optical, AGN

Referred to by ATel #: 2226

The GLAST-AGILE Support Program (GASP) of the Whole Earth Blazar Telescope (WEBT) reports on the recent observation of a strong optical brightening of the blazar 3C 345. This is one of the 28 sources for which the GASP performs a long-term, multiwavelength monitoring. After a faint state (R ~ 17) observed in mid 2009, the brightness started to increase in July, and in August a sharp flare led to a peak of R = 16.09 +/- 0.01 on August 20; this was followed by a fast dimming and subsequent steep rebrightening up to R = 15.75 +/- 0.01 on September 20. The source was observed at R = 16.23 +/- 0.01 five days later, and then the brightness rose again to R = 15.94 +/- 0.01 on September 29; last night, October 1, it was around R = 16.4. At mm wavelengths, 3C 345 has been active since early 2009, with a flux density at 230 GHz oscillating about 3-4 Jy.