The prosecutor told a judge about the allegation during a first appearance Tuesday on domestic violence-related charges of aggravated assault, battery and criminal mischief.
The judge set George Zimmerman's bond at $9,000 and ordered that he not possess guns or ammunition. He was ordered to stay away from the girlfriend's house and wear a monitoring device.
Zimmerman was taken into custody Monday after girlfriend Samantha Scheibe told deputies he pointed a shotgun at her during an argument.
In a 911 call, Zimmerman denied pointing a gun at Scheibe.
The 30-year-old former neighborhood watch volunteer was acquitted earlier this year of criminal charges in the fatal shooting of Trayvon Martin.