Chandra Pitch Angle Restrictions:
Please note that new restrictions on the satellite pitch angle are in place.
BEFORE SUBMITTING A REQUEST for either a TOO or DDT observation:

• Use the PRoVis tool to investigate Chandra spacecraft roll, pitch and visibility for your target as a function of date. Check the pitch angle for your desired target and observing date(s) to be sure your target can be observed.
• If necessary, view the MaxExpo web page to estimate the maximum uninterrupted Chandra exposure time as a function of pitch.
• Download ObsVis to examine the Chandra instrument Field of View displayed on the sky.

• Target of Opportunity (TOO)
• Director's Discretionary Time(DDT)

1. Peer-reviewed TOOs are TOO proposals that were submitted and accepted as a result of the Chandra Call for Proposals (CfP). The observer needs to demonstrate that the peer-reviewed trigger criteria have been met. The observer must also supply target coordinates if these were not known in advance. The TOO observer is encouraged to use the Remarks box to report any changes in observing instructions, any special observing instructions, instrument parameters, or other alerts that will aid in obtaining a successful observation.

   To activate a peer-reviewed TOO please use the TOO Trigger Form.

2. 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. In addition, all pointing and instrument parameters must be specified.

   To submit an RfO (Request for Observation) of this type, please use the DDT version of RPS. Please see the instructions for Director's Discretionary Time .

   The decision whether to observe a TOO is made by the Observatory Director or his designated alternate. TOOs fundamentally interrupt the observing timeline (planned at least 72 hours in advance), so considerable work must be done to alter Chandra's schedule.

   
   

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   RPS was written at the HEASARC and
   modifications to support Chandra were made at the CXC.
   
   
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   Last modified: 10/07/09