{
  "bibcode": "2023GCN.33398....1D",
  "body": "M. Dafcikova, J. Ripa (Masaryk U.), A. Pal (Konkoly Observatory), N. Werner\n(Masaryk U.), M. Ohno, H. Takahashi (Hiroshima U.), L. Meszaros, B. Csak\n(Konkoly Observatory), N. Husarikova, F. Munz , M. Topinka, M. Kolar, J.-P.\nBreuer, F. Hroch (Masaryk U.), T. Urbanec, M. Kasal,  A. Povalac (Brno U.\nof Technology), J. Hudec, J. Kapus, M. Frajt (Spacemanic s.r.o), R. Laszlo,\nM. Koleda (Needronix s.r.o), M. Smelko, P. Hanak, P. Lipovsky (Technical U.\nof Kosice), G. Galgoczi (Wigner Research Center/Eotvos U.), Y. Uchida, H.\nPoon, H. Matake (Hiroshima U.), N. Uchida (ISAS/JAXA), T. Bozoki (Eotvos\nU.), G. Dalya (Eotvos U.), T. Enoto (Kyoto U.), Zs. Frei (Eotvos U.), G.\nFriss (Eotvos U.), Y. Fukazawa, K. Hirose (Hiroshima U.), S. Hisadomi\n(Nagoya U.), Y. Ichinohe (Rikkyo U.), K. Kapas (Eotvos U.), L. L. Kiss\n(Konkoly Observatory),  T. Mizuno (Hiroshima U.), K. Nakazawa (Nagoya U.),\nH. Odaka (Univ of Tokyo), J. Takatsy (Eotvos U.), K. Torigoe (Hiroshima\nU.), N. Kogiso, M. Yoneyama (Osaka Metropolitan U.), M. Moritaki (U.\nTokyo), T. Kano (U. Michigan) -- the GRBAlpha collaboration.\n\nThe long-duration GRB 230304B (Fermi/GBM detection: GCN Circ. 33396;\nCALET/CGBM detection: trigger no. 1361975601; INTEGRAL/SPI-ACS detection at\n2023-03-04 14:35:47.510) was observed by the GRBAlpha 1U CubeSat (Pal et\nal. Proc. SPIE 2020).\n\nThe detection was confirmed at the peak time 2023-03-04 14:35:49 UTC. The\nT90 duration measured by GRBAlpha is 16 s and the overall significance\nduring T90 reaches 28 sigma.\n\nThe light curve obtained by GRBAlpha is available here:\n\nhttps://grbalpha.konkoly.hu/static/share/GRB230304B_GCN.pdf\n\nAll GRBAlpha detections are listed at:\nhttps://monoceros.physics.muni.cz/hea/GRBAlpha/\n\nGRBAlpha, launched on 2021 March 22, is a demonstration mission for a\nfuture CubeSat constellation (Werner et al. Proc. SPIE 2018). The detector\nof GRBAlpha consists of a 75 x 75 x 5 mm3 CsI scintillator read out by a\nSiPM array, covering the energy range from ~50 keV to ~1000 keV. To\nincrease the duty cycle and the downlink rate, the upgrade of the on-board\ndata acquisition software stack is in progress. The ground segment is also\nsupported by the radio amateur community and it takes advantage of the\nSatNOGS network for increased data downlink volume.",
  "circularId": 33398,
  "createdOn": 1678058487000,
  "email": "500025@mail.muni.cz",
  "subject": "GRB 230304B: Detection by GRBAlpha",
  "submitter": "Marianna Dafcikova at Masaryk University  <500025@mail.muni.cz>",
  "eventId": "GRB 230304B"
}