We will have the 13th online colloquium “Extreme Universe Colloquium” on February 24th (Fri) 16:00 (JST). The speaker is Prof. Takahiro Tanaka (Kyoto University). For details, please refer to the poster. If you have not registered yet, please register at our online event website at least three days prior to the colloquium. (It is not necessary to register again if you have done it already.)