{
  "bibcode": "2022GCN.31937....1R",
  "body": "J. Ripa (Masaryk U.), A. Pal (Konkoly Observatory), M. Ohno (Eotvos \nU./Hiroshima U.),�� N. Werner�� (Masaryk U.),�� L. Meszaros (Konkoly \nObservatory), H. Takahashi (Hiroshima U.), B. Csak (Konkoly \nObservatory), M. Topinka, F. Munz, F. Hroch (Masaryk U.), J. Hudec, J. \nKapus, M. Frajt, M. Rezenov (Spacemanic s.r.o), R. Laszlo (Needronix), \nG. Galgoczi (Wigner Research Center/Eotvos U.), N. Uchida (ISAS/JAXA), \nT. Enoto (Kyoto U.), Zs. Frei (Eotvos U.), Y. Fukazawa, K. Hirose, H. \nMatake (Hiroshima U.), S. Hisadomi (Nagoya U.), Y. Ichinohe (Rikkyo U.), \nL. L. Kiss (Konkoly Observatory),�� T. Mizuno (Hiroshima U.), K. Nakazawa \n(Nagoya U.), H. Odaka (Univ of Tokyo), K. Torigoe (Hiroshima U.), P. \nSvoboda, V. Daniel, J. Dudas, M. Junas, J. Gromes (VZLU), I. Vertat (FEL \nZCU)�� -- the VZLUSAT-2/GRB payload collaboration.\n\nA GRB detected by GECAM (trigger at 2022-04-21 21:03:20.6 observation ID \n00035461090, https://www.swift.psu.edu/guano/) was also detected by both \nGRB detector units on board of the VZLUSAT-2 3U CubeSat \n(https://www.vzlusat2.cz/en/). Note that the reported GECAM trigger is \n~15s earlier than the onset of the GRB seen by VZLUSAT-2.\n\nThe data acquisition was performed by GRB detector units no. 0 and no. \n1. The 38 sigma detection significance was confirmed at 2022-04-21 \n21:03:47 UTC. The long-duration GRB has the T90 duration of 62 s.\n\nThe light curve obtained by VZLUSAT-2 is available here:\nhttps://vzlusat2.konkoly.hu/static/share/GRB220421B_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": 31937,
  "createdOn": 1650729315000,
  "email": "ripa.jakub@mail.muni.cz",
  "subject": "GRB 220421B: Detection by VZLUSAT-2",
  "submitter": "Jakub Ripa at Masaryk University  <ripa.jakub@mail.muni.cz>",
  "eventId": "GRB 220421B"
}