{
  "bibcode": "2022GCN.33088....1R",
  "body": "J. Ripa (Masaryk U.), A. Pal (Konkoly Observatory),�� N. Werner (Masaryk \nU.), M. Ohno (Hiroshima U.),�� L. Meszaros, B. Csak (Konkoly \nObservatory), H. Takahashi (Hiroshima U.), F. Munz , M. Topinka, F. \nHroch, M. Dafcikova, N. Husarikova, J.-P. Breuer (Masaryk U.), J. Hudec, \nJ. Kapus, M. Frajt, M. Rezenov (Spacemanic s.r.o), R. Laszlo \n(Needronix), G. Galgoczi (Wigner Research Center/Eotvos U.), N. Uchida \n(ISAS/JAXA), T. Enoto (Kyoto U.), Zs. Frei (Eotvos U.), Y. Fukazawa, K. \nHirose, H. Matake (Hiroshima U.), S. Hisadomi (Nagoya U.), Y. Ichinohe \n(Rikkyo U.), L. L. Kiss (Konkoly Observatory),�� T. Mizuno (Hiroshima \nU.), K. Nakazawa (Nagoya U.), H. Odaka (Univ of Tokyo), K. Torigoe \n(Hiroshima U.), P. Svoboda, V. Daniel, J. Dudas, M. Junas, J. Gromes \n(VZLU), I. Vertat (FEL ZCU) -- the VZLUSAT-2/GRB payload collaboration.\n\nThe long-duration GRB 221216A (Fermi/GBM detection: Dunwoody et al., GCN \nCirc. 33077; Dichiara et al., GCN Circ. 33067; GECAM-B trigger num. 105) \nwas detected by the GRB detector on board of the VZLUSAT-2 3U CubeSat \n(https://www.vzlusat2.cz/en/).\n\nThe data acquisition was performed by GRB detector unit no. 1 and the \ncount rate curve shows the peak time at 2022-12-16 11:21:28 UTC. The T90 \nduration was measured to be 90 s with the light curve resolution of 1 s. \nThe significance during T90 reaches 9.5 sigma.\n\nThe light curve obtained by VZLUSAT-2 is available here:\nhttps://vzlusat2.konkoly.hu/static/share/GRB221216A_GCN_VZLUSAT2.pdf\n\nGRB detectors on VZLUSAT-2 are a demonstration payload for a future \nCubeSats constellation (Werner et al. Proc. SPIE 2018). Two GRB modules \nof VZLUSAT-2 are placed in a perpendicular manner and each consists of a \n75 x 75 x 5 mm3 CsI scintillator read out by a SiPM array, covering the \nenergy range from ~30 keV to ~1000 keV. VZLUSAT-2 was launched on 2022 \nJanuary 13 from Cape Canaveral.",
  "circularId": 33088,
  "createdOn": 1671542275000,
  "email": "245487@mail.muni.cz",
  "subject": "GRB 221216A: Detection by VZLUSAT-2",
  "submitter": "Jakub Ripa at Masaryk University  <245487@mail.muni.cz>",
  "eventId": "GRB 221216A"
}