Mine

default
{
    state_entry()
    {
        vector rot_vec = <0.0, 90.0, 0.0>;
        rot_vec *= DEG_TO_RAD;
        rotation rot = llEuler2Rot(rot_vec);
        llSetRot(rot);
        llSetPrimitiveParams([
                            PRIM_TEMP_ON_REZ, 
                                TRUE, 
                            PRIM_PHANTOM, 
                                TRUE
                            ]);
        llSetAlpha(0.0, ALL_SIDES);
        llParticleSystem([
                    PSYS_PART_FLAGS,
                        PSYS_PART_INTERP_SCALE_MASK |
                        PSYS_PART_FOLLOW_SRC_MASK |
                        PSYS_PART_INTERP_COLOR_MASK,
                    PSYS_SRC_PATTERN,
                        PSYS_SRC_PATTERN_ANGLE,
                    PSYS_SRC_ANGLE_BEGIN,
                        0.0,
                    PSYS_SRC_ANGLE_END,
                        PI,
                    PSYS_PART_START_COLOR,
                        <1.0, 1.0, 1.0>,
                    PSYS_PART_END_COLOR,
                        <0.0, 1.0, 1.0>,
                    PSYS_PART_START_ALPHA,
                        0.5,
                    PSYS_PART_END_ALPHA,
                        0.01,
                    PSYS_SRC_BURST_PART_COUNT,
                        12,
                    PSYS_SRC_BURST_RATE,
                        1.0,
                    PSYS_PART_START_SCALE,
                        <0.15,0.15,0.0>,
                    PSYS_PART_END_SCALE,
                        ZERO_VECTOR,
                    PSYS_PART_MAX_AGE,
                        1.0                       
        ]);
        llSetTimerEvent(7.0);
    }
    timer()
    {
        llDie();
    }
}