cars dead twice. think its the alarm

ok yeseerday morning when i was waking into work my alram started going off in he parking lot for no reason. so i ent and left the doors unlockd. then 4 hours later my battery was almost complely dead. so last nighti jumped it, brought it home and this morning it was completely dead again. i think the the alarm is staying on somehow and draing the battery. any help? thanks
SAMSUNG-SGH-A877/A877UCID3 SHP/VPP/R5 NetFront/3.5 SMM-MMS/1.2.0 profile/MIDP-2.1 configuration/CLDC-1.1