In all these years I've never had an engine failure below V1. (I've had three at V1.) Most of the mistakes we've seen over the years involve failure to maintain directional control during the reject and simply forgetting to complete the necessary checklists once the aircraft is stopped.
For more about engine failures, take a look at G450 Engine Out Considerations.
Everything here is from the references shown below, with a few comments in an alternate color.
Engine Exceedance, L-R
Engine Fail, L-R
Engine Fire, L-R
Engine Fire Loop Alert, L-R
Engine Hot, L-R
Oil Pressure Low, L-R
Oil Temperature High, L-R
Oil Temperature Low, L-R
Thrust Reverser Unlock, L-R
You might get a CAS message, fire light, noise, vibration, or other indication telling you the engine has failed.
Below V1 you should reject the takeoff.
[G450 AFM, § 4-06-20]
NOTE: Ground spoilers should extend automatically when the power levers are retarded to idle during an aborted takeoff. Extending the speed brakes is required to insure all spoilers are extended.
NOTE: Any takeoff abort should be a maximum stop effort, regardless of the speed at which it is initiated.
NOTE: During a rejected takeoff (RTO) reverse thrust may be used to bring the airplane to a stop (zero ground speed). If reverse thrust is used during a rejected takeoff down to zero ground speed, record the event and report the occurrence for maintenance action.
G450 Rejected Takeoff procedures are specified in the AOM. There are lessons learned over the years you should consider:
Gulfstream G450 Airplane Flight Manual, Revision 35, April 18, 2013
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