Abstract
The quasar 3C273 varied by up to 100% on timescales as short as one day in the optical and IR domains during February and March 1988. In February the source changed from a behavior characterised by a stable IR flux and slow optical variations to one of recurrent optical and IR flares. Five optical flares, of amplitude up to 30–40% were observed, along with two IR flares, both of which were simultaneous with optical events. The second IR flare on March 9th rose from 46mJy to 66mJy (twice the normal (quiescent) value) in one day. The data and some of their implications are described in Courvoisier et al. (1988).
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