{
  "bibcode": "2022GCN.32904....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\nA long-duration GRB 221028A (Swift/BAT detection: Lien et al., GCN Circ. \n32874; AGILE detection: Ursi et al., GCN Circ. 32885; KONUS-Wind \ndetection: trig. time 2022-10-28 13:16:29.550 UT; INTEGRAL/SPI-ACS \ndetection peak at 2022-10-28 13:16:28.3 UT) was detected by both GRB \ndetector units on board of the VZLUSAT-2 3U CubeSat \n(https://www.vzlusat2.cz/en/).\n\nThe data acquisition was performed by GRB detector units no. 0 and no. \n1. The 7.1 (6.1) sigma detection significance was confirmed at detector \nunit no. 0 (no. 1) at 2022-10-28 13:16:26 UTC. The T90 duration was \nmeasured to be 23 s (26 s) for detector unit no. 0 (no. 1).\n\nThe light curve obtained by VZLUSAT-2 is available here:\nhttps://vzlusat2.konkoly.hu/static/share/GRB221028A_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": 32904,
  "createdOn": 1667325911000,
  "email": "245487@mail.muni.cz",
  "subject": "GRB 221028A: Detection by VZLUSAT-2",
  "submitter": "Jakub Ripa at Masaryk University  <245487@mail.muni.cz>",
  "eventId": "GRB 221028A"
}