TITLE:   GCN CIRCULAR
NUMBER:  33170
SUBJECT: GRB 230114A: Detection by VZLUSAT-2
DATE:    23/01/14 22:02:01 GMT
FROM:    Jakub Ripa at Masaryk University  <245487@mail.muni.cz>

J. Ripa (Masaryk U.), A. Pal (Konkoly Observatory),  N. Werner (Masaryk 
U.), M. Ohno (Hiroshima U.),  L. Meszaros, B. Csak (Konkoly 
Observatory), H. Takahashi (Hiroshima U.), F. Munz , M. Topinka, F. 
Hroch, M. Dafcikova, N. Husarikova, J.-P. Breuer (Masaryk U.), J. Hudec, 
J. Kapus, M. Frajt, M. Rezenov (Spacemanic s.r.o), R. Laszlo 
(Needronix), G. Galgoczi (Wigner Research Center/Eotvos U.), N. Uchida 
(ISAS/JAXA), T. Enoto (Kyoto U.), Zs. Frei (Eotvos U.), Y. Fukazawa, K. 
Hirose, H. Matake (Hiroshima U.), S. Hisadomi (Nagoya U.), Y. Ichinohe 
(Rikkyo U.), L. L. Kiss (Konkoly Observatory),  T. Mizuno (Hiroshima 
U.), K. Nakazawa (Nagoya U.), H. Odaka (Univ of Tokyo), K. Torigoe 
(Hiroshima U.), P. Svoboda, V. Daniel, J. Dudas, M. Junas, J. Gromes 
(VZLU), I. Vertat (FEL ZCU)  -- the VZLUSAT-2/GRB payload collaboration.

The long-duration GRB 230114A (Fermi/GBM detection: The Fermi GBM team, 
GCN Circ. 33168; INTEGRAL/SPI-ACS detection peak at 2023-01-14 ~16:59:14 
UT) was detected by the GRB detector on board of the VZLUSAT-2 3U 
CubeSat (https://www.vzlusat2.cz/en/).

The data acquisition was performed by GRB detector unit no. 1 and the 
detection was confirmed at the peak time 2023-01-14 16:59:17 UTC. The 
T90 duration was measured to be 5 s with the light curve resolution of 1 
s. The significance during T90 reaches 6.7 sigma.

The light curve obtained by VZLUSAT-2 is available here:
https://vzlusat2.konkoly.hu/static/share/GRB230114A_GCN_VZLUSAT2.pdf

All VZLUSAT-2 detections are listed at: 
https://monoceros.physics.muni.cz/hea/VZLUSAT-2/
The GRB detectors on VZLUSAT-2 are a demonstration payload for a future 
constellation of CubeSats (Werner et al. Proc. SPIE 2018). Two GRB 
modules of VZLUSAT-2 are placed in a perpendicular manner and each 
consists of a 75 x 75 x 5 mm3 CsI scintillator read out by a SiPM array, 
covering the energy range from ~30 keV to ~1000 keV. VZLUSAT-2 was 
launched on 2022 January 13 from Cape Canaveral.