ToO Requests

ToO request form

Due to a planned power outage at ISAS, ToO requests may not be accepted between 2025 1/23 to 1/26.

Click to Email -- for pre-approved ToO (targets approved as a Guest Observation cycle-1 target.)
Click to Email -- for generic ToO (not approved as GO target. The data will be open to the public.)

Targets of the generic ToO program are expected to be "historic events that should not be overlooked".
The other ones, i.e., "Events expected to occur once or more every few years", may be regarded as a possible reserved ToO observation proposal for following Cycles of the guest observation program.
Refer to the list of approved generic ToO.

You can request of a pre-approved ToO or a generic ToO observation sending an e-mail to the XRISM operational team.
If the mailer does not open after clicking on "Click to Email", please send an e-mail to "xrism-too-trigger@ml.isas.jaxa.jp" with the following information.

• PI's Information
• Your Name (e.g. Tashiro, Makoto):
• Institute (e.g. Saitama U.):
• Contact Email:


• Target information
• Target Name:
• RA:
• Dec:
• Object type (e.g. HMXB, BHB, GRB):
• Expected Resolve count rate:
• Maximum expected Resolve count rate:
• Approximate expected spectrum (e.g. Power Law with gamma 2.1):


• Justification (Any attachment file size must be below 5MB in total.)
• for generic ToO - Science justification (400 words max.):
• for pre-approved ToO - Trigger justification (400 words max.):
• Relevant URL (*optional):
• Likelihood (e.g. 73% within 3 days):


• Operational requirements
• Response time requested: within **+day/week
• the sooner the better? (yes | no):
• Response time justification:
• Observing time: ** ks
• for generic ToO - Justification for observing time:
• Observation mode
• Resolve (OPEN | ND filter):
• Xtend (FULL | 1/8 | 1/8+Burst):


• Others (*optional)
• Coordination with other observatories:
• Remarks: