Abstract: Seismic airgun arrangement for attenuating unwanted oscillations in the emitted signal. The airgun has one or more outlet ports (9) for exhausting air in a generally radial direction from a central axis of the airgun (10), and a perforated screen (20) of plate material is provided around the airgun for the attenuation mentioned. The volume generally delimited within the screen (20) is significantly smaller than the maximum bubble size which is normally generated by the airgun (10). The screen (20) has an open side or end (20A) at a part of the screen that is adapted to face at least partially downward in the normal operative position of the airgun (10). At least edge portions of the screen along the open side or end (20A) are located substantially directed opposite the outlet port or ports (9).