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GCN Circular 32622

Subject
GRB220927A: Detection by GRBAlpha
Date
2022-10-04T15:32:59Z (2 years ago)
From
Jakub Ripa at Masaryk University <245487@mail.muni.cz>
A. Pal (Konkoly Observatory), J. Ripa, N. Werner (Masaryk U.), M. Ohno, 
H. Takahashi (Hiroshima U.), L. Meszaros, B. Csak (Konkoly Observatory), 
M. Dafcikova, N. Husarikova, J.-P. Breuer, F. Munz , M. Topinka, F. 
Hroch (Masaryk U.), T. Urbanec, M. Kasal,�� A. Povalac (Brno U. of 
Technology), J. Hudec, J. Kapus, M. Frajt (Spacemanic s.r.o), R. Laszlo, 
M. Koleda (Needronix s.r.o), M. Smelko, P. Hanak, P. Lipovsky (Technical 
U. of Kosice), G. Galgoczi (Wigner Research Center/Eotvos U.), Y. 
Uchida, H. Poon, H. Matake (Hiroshima U.), N. Uchida (ISAS/JAXA), T. 
Bozoki (Eotvos U.), G. Dalya (Eotvos U.), T. Enoto (Kyoto U.), Zs. Frei 
(Eotvos U.), G. Friss (Eotvos U.), Y. Fukazawa, K. Hirose (Hiroshima 
U.), S. Hisadomi (Nagoya U.), Y. Ichinohe (Rikkyo U.), K. Kapas (Eotvos 
U.), L. L. Kiss (Konkoly Observatory),�� T. Mizuno (Hiroshima U.), K. 
Nakazawa (Nagoya U.), H. Odaka (Univ of Tokyo), J. Takatsy (Eotvos U.), 
K. Torigoe (Hiroshima U.), N. Kogiso, M. Yoneyama (Osaka Metropolitan 
U.), M. Moritaki (U. Tokyo), T. Kano (U. Michigan) -- the GRBAlpha 
collaboration.

The long-duration GRB 220927A (Fermi-GBM detection: Fermi GBM Team, GCN 
32594; IPN triangulation: Kozyrev et al., GCN 32597; Konus-Wind 
detection: Ridnaia et al. GCN 32600) was detected by the GRBAlpha 1U 
CubeSat (Pal et al. Proc. SPIE 2020).

The 19.7 sigma detection was confirmed at the peak time 2022-09-27 
05:36:25.2 UTC. The GRB has the T90 duration of 8 s.

The light curve obtained by GRBAlpha is available here:
https://grbalpha.konkoly.hu/static/share/GRB220927A_GCN.pdf

GRBAlpha is a demonstration mission for a future CubeSats constellation 
(Werner et al. Proc. SPIE 2018). The detector of GRBAlpha consists of a 
75 x 75 x 5 mm3 CsI scintillator read out by a SiPM array, covering the 
energy range from about 50 keV to about 1000 keV. GRBAlpha was launched 
on 2021 March 22 from Baikonur. After its commissioning phase, the 
scientific observations are now under way. To increase the duty cycle 
and the downlink rate, the upgrade of the on-board data acquisition 
software stack is in progress. The ground segment is also supported by 
the radio amateur community and it takes advantage of the SatNOGS 
network for increased data downlink volume.
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