Peer-reviewed TOOs are TOO proposals that were submitted and accepted as a result of the Chandra Call for Proposals (CfP). Since their scientific objectives have already been approved, we require only confirmation of a few details and a brief description of how the trigger criteria has been met. Please use the form below to identify the TOO you wish to trigger. If you are unable to use this form to trigger your TOO, please contact cdo@head.cfa.harvard.edu.
Unanticipated TOOs are charged to Director's Discretionary Time. These will not have not been previously accepted through the Chandra Call for Proposals. For the unanticipated TOOs, a compelling scientific case must be made for inserting them into the mission timeline. To submit an RfO (Request for Observation) of this type, please see the instructions for Director's Discretionary Time.