News about XRISM

See also the news published by JAXA under


November 14, 2023

First Announcement of Opportunity


After successful launch of XRISM on September 7, 2023 and successful critical operation period, the first announcement of opportunity opens November 15, 2023.

In consideration of ESA’s contribution to XRISM, not less than 8% of the total Guest Observing Time, or an equivalent return as mutually agreed, shall be allocated to ESA. The ESA Director of Science has thus issued the invitation to submit Guest Observer proposals for the observation period between July 2024 and June 2025: Letter by ESA Director of Science

Please find all instructions in this document: Announcement of Opportunity for the XRISM GO program

The due date for proposals is 12:30 CET, 22 February 2024
Target for the publication of the POG and the opening of the ARK/RPS: 7 December 2024

More details under:


October 10, 2023

Resolve Operational Temperature reached

After reaching the required operational temperature in the Resolve dewar, the adiabatic demagnetization magnetic refrigerators (ADR) were activated, and the target temperature of 0.050 K for the array stage was achieved.

The full array of detector pixels successfully detected X-rays from the calibration source on the Filter Wheel and showed excellent uniformity, with better than 5 eV energy resolution.

Now, the Xtend system is being activated.

September 7 2023

XRISM Successfully launched and completed critical Operations phase

On September 7 at 8:42:11 JST, XRISM was successfully launched into the low-Earth orbit as planned.

ESA congratulates JAXA with the article

X-ray mission lifts off to study high-energy Universe

The launch event was broadcast life on YouTube, and the recording is accessible under:

On Sept.11, JAXA announced the successful completion of the critical operation phase:

August 21 2023

Next major X-ray mission set to launch

Update: The the launch has been postponed 3 times.

The final launch target time has been set at 8:42:11 JST on Thursday, September 7

   UT: 23:42:11 Wednesday Sept. 6

   CEST: 01:42:11 Sept.7

Ahead of the launch some info was released in this ESA article:

Next major X-ray mission set to launch

giving some useful information about XRISM and a link to Twitter where to follow the launch life.

Here the official JAXA (English) YouTube channel:

P.S. The launch time to second precision is driven by the SLIM moonlander being launched on the same vehicle. It requires second-precision launch to get on the right path to the moon. There is only one 1-s launch slot a day, so either it is this time or next day.......

July 11 2023

Launch of XRISM announced

The X-Ray Imaging and Spectroscopy Mission (XRISM) and the Smart Lander for Investigating Moon (SLIM) will be launched onboard the H-IIA Launch Vehicle No. 47 (H-IIA F47) detailed as follows:

Launch date : August 26, 2023
Launch Time : 9:34:57 A.M. (JST) *
Reserved Launch Period : August 27 through September 15, 2023
Launch site : Yoshinobu Launch Complex at the JAXA Tanegashima Space Center

(*) The launch time during the reserved launch period will be set each day.

See official press release under: