  The ANTARES telescope is well suited to detect neutrinos produced in
astrophysical transient sources as it can observe a full hemisphere of the sky
at all times with a high duty cycle. The background and point source
sensitivity can be drastically reduced by selecting a narrow time window around
the assumed neutrino production period. Radio-loud active galactic nuclei with
their jets pointing almost directly towards the observer, the so- called
blazars, are particularly attractive potential neutrino point sources, since
they are among the most likely sources of the observed ultra high energy cosmic
rays and therefore, neutrinos and gamma-rays may be produced in hadronic
interactions with the surrounding medium. The gamma-ray light curves of blazars
measured by the LAT instrument on-board the Fermi satellite reveal important
time variability information. A strong correlation between the gamma-ray and
the neutrino fluxes is expected in this scenario. An unbinned method based on
the minimization of a likelihood ratio was applied to a subsample data
collected in 2008 (61 days live time). By looking for neutrinos detected in the
high state periods of the AGN light curve, the sensitivity to these sources has
been improved by about a factor 2 with respect to a standard time-integrated
point source search. First results on the search for ten bright and variable
Fermi sources are presented.
