{
  "bibcode": "2022GCN.32953....1P",
  "body": "A. Pal (Konkoly Observatory), J. Ripa, M. Dafcikova, N. Werner (Masaryk \nU.), M. Ohno, H. Takahashi (Hiroshima U.), L. Meszaros, B. Csak (Konkoly \nObservatory), F. Munz, N. Husarikova, J.-P. Breuer, M. Topinka, F. Hroch \n(Masaryk U.), T. Urbanec, M. Kasal, A. Povalac (Brno U. of Technology), J. \nHudec, J. Kapus, M. Frajt (Spacemanic s.r.o), R. Laszlo, M. Koleda \n(Needronix s.r.o), M. Smelko, P. Hanak, P. Lipovsky (Technical U. of \nKosice), G. Galgoczi (Wigner Research Center/Eotvos U.), Y. Uchida, H. \nPoon, H. Matake (Hiroshima U.), N. Uchida (ISAS/JAXA), T. Bozoki (Eotvos \nU.), G. Dalya (Eotvos U.), T. Enoto (Kyoto U.), Zs. Frei (Eotvos U.), G. \nFriss (Eotvos U.), Y. Fukazawa, K. Hirose (Hiroshima U.), S. Hisadomi \n(Nagoya U.), Y. Ichinohe (Rikkyo U.), K. Kapas (Eotvos U.), L. L. Kiss \n(Konkoly Observatory), T. Mizuno (Hiroshima U.), K. Nakazawa (Nagoya U.), \nH. Odaka (Univ of Tokyo), J. Takatsy (Eotvos U.), K. Torigoe (Hiroshima \nU.), N. Kogiso, M. Yoneyama (Osaka Metropolitan U.), M. Moritaki (U. \nTokyo), T. Kano (U. Michigan) -- the GRBAlpha collaboration.\n\nThe long-duration GRB 221119A (Fermi/GBM detection: GCN Circ. 32950; \nGECAM-B detection at 2022-11-19 15:02:54.65 UT, trigg. num. 72; also \ndetected by INTEGRAL/SPI-ACS) was detected by the GRBAlpha 1U CubeSat (Pal \net al. Proc. SPIE 2020). The first double-peaked signal, acquired with a \n1-second cadence was confirmed with a ~14 sigma detection at the peak \ntimes of 2022-11-19 15:02:55 and 15:02:58 UTC, respectively. In addition, \nthe presence, duration and amplitude of the second peak is also confirmed \nby the GRBAlpha light curve 40-50 seconds after the double peaks. The T90 \nduration of this GRB is 54 seconds and the overall significance during T90 \nreaches 23.5.\n\nThe light curve obtained by GRBAlpha is available here: \nhttps://grbalpha.konkoly.hu/static/share/GRB221119A_GCN.pdf\n\nGRBAlpha, launched on 2021 March 22, is a demonstration mission for a \nfuture CubeSat constellation (Werner et al. Proc. SPIE 2018). Its detector \nconsists of a 75 x 75 x 5 mm^3 CsI(Tl) scintillator read out by a SiPM \narray, covering the energy range from ~50 keV to ~1000 keV. To increase \nthe duty cycle and the downlink rate, we are continuously upgrading the \non-board data acquisition software stack. The ground segment is also \nsupported by the radio amateur community, and it takes advantage of the \nSatNOGS network for increased data downlink volume, also allowing us the \nretrieval with a small latency. We would like to thank the support of the \noperators of the individual receiver stations as well as the maintenance \nof the network itself.",
  "circularId": 32953,
  "createdOn": 1668956840000,
  "email": "apal@konkoly.hu",
  "subject": "GRB 221119A: Detection by GRBAlpha",
  "submitter": "Andras Pal at Konkoly Observatory  <apal@konkoly.hu>",
  "eventId": "GRB 221119A"
}