We present observations carried out using the 10.4 m Gran Telescopio Canarias and an interpretative model of the dust environment of activated asteroid 313P/Gibbs .
We discuss three different models relating to different values of the dust parameters , i.e , dust loss rate , maximum and minimum sizes of particles , power index of the size distribution , and emission pattern .
The best model corresponds with an isotropic emission of particles which started on August 1st .
The size of grains were in the range of 0.1 - 2000 \mu m , with velocities for 100 \mu m particles between 0.4 - 1.9 m ~ { } s ^ { -1 } , with a dust production rate in the range of 0.2 - 0.8 kg ~ { } s ^ { -1 } .
The dust tails ’ brightness and morphology are best interpreted in terms of a model of sustained and low dust emission driven by water-ice sublimation , spanning since 2014 August 1st , and triggered by a short impulsive event .
This event produced an emission of small particles of about 0.1 \mu m with velocities of \sim 4 m ~ { } s ^ { -1 } .
From our model we deduce that the activity of this Main-Belt Comet continued for , at least , four months , since activation .