GCN Circular 40663

A. Pal (Konkoly Observatory), N. Werner (Masaryk U.), L. Meszaros (Konkoly Observatory), J. Ripa (Masaryk U.), M. Ohno (Hiroshima U.), M. Dafcikova (Masaryk U.), H. Takahashi (Hiroshima U.), B. Csak (Konkoly Observatory), N. Husarikova, F. Munz , M. Topinka, M. Duriskova, M. Kolar, L. Szakszonova, J.-P. Breuer, F. Hroch (Masaryk U.), T. Urbanec, M. Kasal,  A. Povalac (Brno U. of Technology), J. Hudec, J. Kapus, M. Frajt (Spacemanic s.r.o), R. Laszlo, M. Koleda (Needronix s.r.o), M. Smelko, P. Hanak, P. Lipovsky (Technical U. of Kosice), G. Galgoczi (Wigner Research Center/Eotvos U.), Y. Uchida, H. Poon, H. Matake (Hiroshima U.), N. Uchida (ISAS/JAXA), T. Bozoki (Eotvos U.), G. Dalya (Eotvos U.), T. Enoto (Kyoto U.), Zs. Frei (Eotvos U.), G. Friss (Eotvos U.), Y. Fukazawa, K. Hirose (Hiroshima U.), S. Hisadomi (Nagoya U.), Y. Ichinohe (Rikkyo U.), K. Kapas (Eotvos U.), L. L. Kiss (Konkoly Observatory),  T. Mizuno (Hiroshima U.), K. Nakazawa (Nagoya U.), H. Odaka (Univ of Tokyo), J. Takatsy (Eotvos U.), K. Torigoe (Hiroshima U.), N. Kogiso, M. Yoneyama (Osaka Metropolitan U.), M. Moritaki (U. Tokyo), T. Kano (U. Michigan) -- the GRBAlpha collaboration.

After more than 4 years of scientific operations, on June 9, 2025, GRBAlpha, an 1U CubeSat reentered the Earth's atmosphere. GRBAlpha was the first GRB detecting CubeSat of this size and the smallest astrophysical space observatory (Pál et al. 2023, A&A, 677, A40). With 127 GRBs and a similar number of solar flare detections it successfully demonstrated that monitoring of gamma-ray transients can be effectively performed by CubeSats. We thank for the support of the radio amateur community, especially the maintainers and the station owners of the SatNOGS network. We look forward to more successful nanosatellite missions!