{
  "bibcode": "2021GCN.30945....1O",
  "body": "M. Ohno (Eotvos U./Konkoly Observatory/Hiroshima U.),  J. Ripa (Masaryk\nU.), H. Takahashi (Hiroshima U.), A. Pal, L. Meszaros, B. Csak (Konkoly\nObservatory), N. Werner, M. Topinka, F. Munz, F. Hroch (Masaryk U.), T.\nUrbanec, M. Kasal,  A. Povalac (Brno U. of Technology), J. Hudec, J. Kapus,\nM. Frajt (Spacemanic s.r.o), R. Laszlo, M. Koleda (Needronix s.r.o), M.\nSmelko, P. Hanak, P. Lipovsky (Technical U. of Kosice), G. Galgoczi (Wigner\nResearch Center/Eotvos U.), Yuusuke Uchida, Helen Poon, H. Matake, N.\nUchida (Hiroshima U.), T. Bozoki (Eotvos U.), G. Dalya (Eotvos U.), T.\nEnoto (Kyoto U.), Zs. Frei (Eotvos U.), G. Friss (Eotvos U.), Y. Fukazawa,\nK. Hirose (Hiroshima U.), S. Hisadomi (Nagoya U.), Y. Ichinohe (Rikkyo U.),\nK. Kapas (Eotvos U.), L. L. Kiss (Konkoly Observatory),  T. Mizuno\n(Hiroshima U.), K. Nakazawa (Nagoya U.), H. Odaka (Univ of Tokyo), J.\nTakatsy (Eotvos U.), K. Torigoe (Hiroshima U.) -- the GRBAlpha\ncollaboration.\n\nThe bright/long duration GRB 211018A (Fermi-GBM detection trigger\n656288898/211018936, Fermi-LAT detection; Arimoto et al., GCN Circ. 30943)\nwas detected by the GRBAlpha 1U CubeSat (Pal et al. Proc. SPIE 2020).\n\nThe light curve shows a very long multiple-peaked structure with a duration\nof about 168 s (T90 = 140 s). At 22:29:34 UTC, our detection reached a SNR\n~ 46.\n\nThe light curve obtained by GRBAlpha is available here:\nhttps://grbalpha.konkoly.hu/static/share/GRB211018A_GCN.pdf\n\nGRBAlpha is a demonstration mission for a future CubeSats constellation\n(Werner et al. Proc. SPIE 2018). The detector of GRBAlpha consists of a 75\nx 75 x 5 mm3 CsI scintillator read out by a SiPM array, covering the energy\nrange from ~50 keV to ~1000 keV. GRBAlpha was launched on 2021 March 22\nfrom Baikonur. After its commissioning phase, the scientific observations\nare now under way. To increase the duty cycle and the downlink rate, the\nupgrade of the on-board data acquisition software stack is in progress. The\nground segment is also supported by the radio amateur community and it\ntakes advantage of the SatNOGS network for increased data downlink volume.",
  "circularId": 30945,
  "createdOn": 1634645137000,
  "email": "ohno@astro.hiroshima-u.ac.jp",
  "subject": "GRB 211018A: Detection by GRBAlpha",
  "submitter": "Masanori Ohno at Hiroshima U  <ohno@astro.hiroshima-u.ac.jp>",
  "eventId": "GRB 211018A"
}