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We present and analyse new  R ‐band frames of the gravitationally lensed double quasar FBQ 0951+2635. These images were obtained with the 1.5‐m AZT‐22 Telescope at Maidanak (Uzbekistan) during the 2001–2006 period. Previous results in the  R  band (1999–2001 period) and the new data allow us to discuss the dominant kind of microlensing variability in FBQ 0951+2635. The time evolution of the flux ratio  A / B  does not favour the continuous production of short‐time‐scale (∼months) flares in the faintest quasar component  B  (crossing the central region of the lensing galaxy). Instead of a rapid variability scenario, the observations are consistent with the existence of a long‐time‐scale fluctuation. The flux ratio shows a bump during the 2003–2004 period and a quasi‐flat trend in more recent epochs. Apart from the global behaviour of  A / B , we study the intra‐year variability over the first semester of 2004, which is reasonably well sampled. Short‐time‐scale microlensing is not detected in that period. Additional data in the  i  band (from new  i ‐band images taken in 2007 with the 2‐m Liverpool Robotic Telescope at La Palma, Canary Islands) also indicate the absence of short‐time‐scale events in 2007.

Microlensing variability in FBQ 0951+2635: short‐time‐scale events or a long‐time‐scale fluctuation?