  Follow-up of gravitational wave alerts has proven to be challenging in the
past due to the large uncertainty on the localisation, much larger than the
field of view of most instruments. A smart pointing strategy helps to increase
the chance of observing the true position of the underlying compact binary
merger event and so to detect an electromagnetic counterpart. To tackle this, a
software called tilepy has been developed and was successfully used by the
H.E.S.S. collaboration to search for very-high energy gamma-ray emission from
GWs during the O2 and O3 runs. The optimised tiling strategies implemented in
tilepy allowed H.E.S.S. to be the first ground facility to point toward the
true position of GW 170817. Here we present the main strategy used by the
software to compute an optimal observation schedule. The Astro-COLIBRI platform
helps to plan follow-up of a large range of transient phenomena including GW
alerts. The integration of tilepy in this tool allow for an easy planning and
visualisation of of follow-up of gravitational wave alert helping the
astronomer to maximise the chance of detecting a counterpart. The platform also
provides an overview of the multi-wavelength context by grouping and
visualising information coming from different observatories alongside GW
alerts.
