alerting

(noun) a state of readiness to respond. Synonyms: alertness. Example: "Alerting was indicated by the desynchronization of the eeg."

(noun) a warning serves to make you more alert to danger. Synonyms: alert.

(verb) warn or arouse to a sense of danger or call to a state of preparedness. Synonyms: alarm, alert. Examples: "The empty house alarmed him." "We alerted the new neighbors to the high rate of burglaries."