A320 CREW HAD A TCASII RA DEPARTING LGA ON THE LGA 9 SID ON THE FLUSHING CLB IN N90 CLASS B AIRSPACE.

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CLBING OUT OF LGA ON RWY 13; WE WERE GIVEN THE FLUSHING CLB. THE SID WITH THE FLUSHING CLB IS RWY HDG TO 2.5 DME THEN A L TURN TO 040 DEGS. I WAS FLYING AND PERFORMED A MAX TOGA CLB. AT APPROX 1000 FT; I REDUCED THE PWR TO CLB AND WAS ABOUT TO CALL FOR FLAPS 0 DEGS. I LOWERED THE NOSE SLIGHTLY AND IMMEDIATELY GOT 'MONITOR VERT SPD.' WITHIN 2 SECONDS I GOT THE 'CLB; XING; CLB' RA. I CONTINUED WITH A MAX CLB AND THE RA WENT AWAY ALMOST IMMEDIATELY. BECAUSE I WAS THE PF I DID NOT GET A GOOD LOOK AT WHERE THE ACFT WAS. THE CAPT FIGURED IT TO BE 400 FT. HE WAS NOT SURE IF IT WAS ABOVE OR BELOW AND HE THOUGHT THE RA WAS A 'CLB; XING; CLB' AND NOT A 'CLB; CLB; CLB.' I CAN'T RECALL FOR SURE. THE CAPT FIGURED THE ACFT WAS AT 1/4 MI OR LESS FROM THE TCASII PICTURE. DEP SAID IT WAS A HELI; OVER A SPORTING EVENT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THIS IS THE FIRST TIME THE PLT HAS HAD A TCASII RA SO SOON AFTER TKOF. HE DOES NOT THINK ATC SHOULD ALLOW ACFT OP SO CLOSE TO DEPARTING ACFT. HE STATED IT REALLY WAS A STARTLING; ADRENALINE PUMPING EVENT. HE SAID 'THANK GOD FOR TCASII.'