{
  "bibcode": "2023GCN.33424....1R",
  "body": "J. Ripa (Masaryk U.), M. Dafcikova, 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. \nTopinka, F. Hroch, 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 extremely bright long-duration GRB 230307A (Fermi/GBM detection: GCN \n33405, 33407, 33411, 33414; GECAM-B detection: GCN 33406; Solar Orbiter \nSTIX detection: GCN 33410; AGILE/MCAL detection: GCN 33412; IPN \ntriangulation: GCN 33413; AstroSat detection: GCN 33415; BALROG \nlocalization: GCN 33416; GRBAlpha detection: GCN 33418) was detected by \nthe GRB detectors 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 detection was confirmed at the peak time 2023-03-07 15:44:11 UTC. \nThe T90 duration measured by VZLUSAT-2 is 28 s (34 s) and the \nsignificance during T90 reaches 219 sigma (213 sigma) for detector unit \nno. 0 (no. 1).\n\nThe light curves obtained by VZLUSAT-2 is available here:\nhttps://vzlusat2.konkoly.hu/static/share/GRB230307A_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 \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 ~40 keV to ~1000 keV. VZLUSAT-2 was launched on 2022 \nJanuary 13 from Cape Canaveral.",
  "circularId": 33424,
  "createdOn": 1678299186000,
  "email": "245487@mail.muni.cz",
  "subject": "GRB 230307A: VZLUSAT-2 detection",
  "submitter": "Jakub Ripa at Masaryk University  <245487@mail.muni.cz>",
  "eventId": "GRB 230307A"
}