GASP observation of a spectacular optical-to-radio brightening of the blazar AO 0235+16

Astronomy and Astrophysics – Astronomy

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Radio, Millimeter, Infra-Red, Optical, Agn

Scientific paper

The GLAST-AGILE Support Program (GASP) of the Whole Earth Blazar Telescope (WEBT) reports on the recent observation of a spectacular optical-to- radio brightening of the blazar AO 0235+16, reaching levels comparable to those of the 2006-2007 outburst (see Raiteri et al. 2008, A&A, 480, 339). On August 12, 2008, the source was at R ~ 17.5 and brightened by 1 mag in the next 3 days; after an oscillating and increasing trend it was at R ~ 16.1 on September 8, and a further brightening led to R ~ 14.75 on September 17.8, followed by a slight dimming to R ~ 15.1 at September 18.0.

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