  GASP (GAs Stripping Phenomena in galaxies with MUSE) is a new integral-field
spectroscopic survey with MUSE at the VLT aiming at studying gas removal
processes in galaxies. We present an overview of the survey and show a first
example of a galaxy undergoing strong gas stripping. GASP is obtaining deep
MUSE data for 114 galaxies at z=0.04-0.07 with stellar masses in the range
10^9.2-10^11.5 M_sun in different environments (galaxy clusters and groups,
over more than four orders of magnitude in halo mass). GASP targets galaxies
with optical signatures of unilateral debris or tails reminiscent of gas
stripping processes ("jellyfish galaxies"), as well as a control sample of disk
galaxies with no morphological anomalies. GASP is the only existing Integral
Field Unit (IFU) survey covering both the main galaxy body and the outskirts
and surroundings, where the IFU data can reveal the presence and the origin of
the outer gas. To demonstrate GASP's ability to probe the physics of gas and
stars, we show the complete analysis of a textbook case of a "jellyfish"
galaxy, JO206. This is a massive galaxy (9 x 10^10 M_sun in a low-mass cluster
(sigma ~500 km/s), at a small projected clustercentric radius and a high
relative velocity, with >=90kpc-long tentacles of ionized gas stripped away by
ram pressure. We present the spatially resolved kinematics and physical
properties of gas and stars, and depict the evolutionary history of this
galaxy.
