{
  "bibcode": "2023GCN.33590....1D",
  "body": "M. Dafcikova, J. Ripa (Masaryk U.), A. Pal (Konkoly Observatory),  N.\nWerner  (Masaryk U.), M. Ohno (Hiroshima U.),  L. Meszaros, B. Csak\n(Konkoly Observatory), H. Takahashi (Hiroshima U.), F. Munz , M. Topinka,\nF. Hroch, N. Husarikova, J.-P. Breuer (Masaryk U.), J. Hudec, J. Kapus, M.\nFrajt, M. Rezenov (Spacemanic s.r.o), R. Laszlo (Needronix), G. Galgoczi\n(Wigner Research Center/Eotvos U.), N. Uchida (ISAS/JAXA), T. Enoto (Kyoto\nU.), Zs. Frei (Eotvos U.), Y. Fukazawa, K. Hirose, H. Matake (Hiroshima\nU.), S. Hisadomi (Nagoya U.), Y. Ichinohe (Rikkyo U.), L. L. Kiss (Konkoly\nObservatory),  T. Mizuno (Hiroshima U.), K. Nakazawa (Nagoya U.), H. Odaka\n(Univ of Tokyo), K. Torigoe (Hiroshima U.), P. Svoboda, V. Daniel, J.\nDudas, M. Junas, J. Gromes (VZLU), I. Vertat (FEL ZCU)  -- the\nVZLUSAT-2/GRB payload collaboration.\n\nThe long duration GRB 230405B (Fermi/GBM detection: GCN 33570; Swift/BAT\ndetection: GCN 33571; AstroSat detection: GCN 33575; AGILE detection: GCN\n33585; Konus/Wind detection: GCN 33586; INTEGRAL/SPI-ACS detection at\n2023-04-05 19:58:04) was detected by the GRB detector on board of the\nVZLUSAT-2 3U CubeSat (https://www.vzlusat2.cz/en/).\n\nThe data acquisition was performed by the GRB detector unit no. 1 and the\ndetection was confirmed at the peak time 2023-04-05 19:58:04 UTC. The T90\nduration was measured to be 3 s with the light curve resolution of 1 s. The\nsignificance during T90 reaches 25 sigma.\n\nThe light curve obtained by VZLUSAT-2 is available here:\n\nhttps://vzlusat2.konkoly.hu/static/share/GRB230405B_GCN_VZLUSAT2.pdf\n\nAll VZLUSAT-2 detections are listed at:\nhttps://monoceros.physics.muni.cz/hea/VZLUSAT-2/\n\nThe GRB detectors on VZLUSAT-2 are a demonstration payload for a future\nCubeSat constellation (Werner et al. Proc. SPIE 2018). Two GRB modules of\nVZLUSAT-2 are placed in a perpendicular manner and each consists of a 75 x\n75 x 5 mm3 CsI scintillator read out by a SiPM array, covering the energy\nrange from ~30 keV to ~1000 keV. VZLUSAT-2 was launched on 2022 January 13\nfrom Cape Canaveral.",
  "circularId": 33590,
  "createdOn": 1680901627000,
  "email": "500025@mail.muni.cz",
  "subject": "GRB 230405B: VZLUSAT-2 detection",
  "submitter": "Marianna Dafcikova at Masaryk University  <500025@mail.muni.cz>",
  "eventId": "GRB 230405B"
}