CE550 EXECUTES GAR AT SMO WHEN NOTAMED RWY CLOSURE INFO WAS NOT AVAILABLE AT THE SECTOR AND OR BRIEFED.

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ACFT X WAS INBOUND TO SMO. AT APPROX XA40 I TOOK A POINTOUT ON ACFT X INBOUND TO SMO ON AN APCH. SCT LAX ARR SECTOR WAS WORKING THE ACFT. AT APPROX XA50 I RECEIVED A CALL FROM SMO TWR ADVISING ME THAT ACFT X WAS GOING AROUND - THE SMO CTLR SENT HIM AROUND BECAUSE THE RWY WAS NOTAMED CLOSED. I NOTIFIED MY SUPVR WHO APCHED THE OPS MGR'S DESK AREA. THE SUPVR APCHED MY SECTOR AND HANDED ME AN 8 1/2 X 11 INCH SHEET OF PAPER THAT HAD THE CLOSURE NOTAM INFO. THIS INFO WAS NOT DISSEMINATED TO THE AREAS; IT WAS NOT NOTED ON THE 'SIA' BOARD. THE CTLRS AT SCT HAD NO KNOWLEDGE THAT THE NOTAM AND RWY CLOSURE WERE IN EFFECT. SUPPLEMENTAL INFO FROM ACN 706363: A TWR CTLR WAS IN THE CAB EARLY AND TOLD THE ACFT X THE RWY WAS CLOSED. ONLY THROUGH THE LACK OF A CTLR BEING IN THE TWR EARLY WAS A POTENTIALLY DISASTROUS SITUATION SAVED. SUPPLEMENTAL INFO FROM ACN 706813: I CHKED WX/NOTAMS TWICE. I SAW A NOTAM FOR THE RWY CLOSURE AT SMO BUT I MISSED THE TIME. WE WERE CLRED FOR THE VOR APCH AT SMO. ABOUT 3/4 MI FROM THE RWY WE MADE A CALL ON CTAF AND AN UNIDENTED ACFT SAID HE THOUGHT THE RWY WAS CLOSED. WE THOUGHT HE WAS REFERRING TO NOISE RESTRS TO DEP AND AT ABOUT 200 FT AGL SOMEONE; WHOM I BELIEVE TO BE A TWR CTLR; TOLD US TO MAKE A MISSED APCH. I TAKE COMPLETE RESPONSIBILITY FOR MISREADING THE NOTAM; BUT IN RETROSPECT; CTLRS CLRED THE ACFT FOR APCH WHEN THE APCH WAS NOTAMED N/A. SHOULDN'T ATC KNOW ABOUT NOTAMS AND NOT CLR ACFT FOR APCHS CONTRARY TO NOTAMS?