I think Gkup is saying his alarm is going off momentarily, as compared to the security system chirping when arming/disarming.
Both our 15's also randomly do this as well when I push them out of the garage. Done this since new. Gives one good and LOUD screech. Tried every location possible for the fob and even tried moving the bike in accessory mode and then the RUN switch on (headlights, Boombox all on AND alarm chirp to indicate deactivation). You guessed it, every 9 or 10 times I pushed the bikes out it would scream a short blast. I should mention if the bike is started and running have never had the alarm go off.
For those wanting to switch to chirpless, or to chirp mode here is what the manual says. Note: read the following before you start as there are some actions that happen very quickly.
1 - With fob present, set the OFF/RUN switch to RUN
2- When the security lamp turns off, set the OFF/RUN switch to OFF
3- When the security lamp turns off (but before the turn signals flash twice), immediately set the OFF/RUN switch to RUN
4- When the security lamp turns off, immediately set the OFF/RUN switch to OFF.
5- When the security lamp turns off (but before the turn signals flash twice), immediately set the OFF/RUN switch to RUN. The system changes mode. The siren chirps or remains silent accordingly.