GCN Circular 31965
Subject
GRB 220423A: Detection by VZLUSAT-2
Date
2022-04-28T16:36:12Z (2 years ago)
From
Jakub Ripa at Masaryk University <ripa.jakub@mail.muni.cz>
J. Ripa (Masaryk U.), A. Pal (Konkoly Observatory), M. Ohno (Hiroshima
U.),�� N. Werner�� (Masaryk U.),�� L. Meszaros (Konkoly Observatory), H.
Takahashi (Hiroshima U.), B. Csak (Konkoly Observatory), M. Topinka, F.
Munz, F. Hroch (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.
A long-duration GRB 220423A (AGILE/MCAL detection: Ursi et al., GCN
Circ. 31938, Happy Birthday to AGILE!; Swift/BAT detection: Raman et
al., GCN Circ. 31943; CALET/CGMB detection: trig. #1334758343;
INTEGRAL/SPI-ACS detection: trig. #9870; KONUS-Wind detection: trig.
time 2022-04-23 14:14:07.818 UT) was detected by both GRB detector units
on board of the VZLUSAT-2 3U CubeSat (https://www.vzlusat2.cz/en/).
The data acquisition was performed by GRB detector units no. 0 and no.
1. The 28 sigma detection significance was confirmed at each detector at
2022-04-23 14:14:14 UTC. The GRB has the T90 duration of 37 s.
The light curve obtained by VZLUSAT-2 is available here:
https://vzlusat2.konkoly.hu/static/share/GRB220423A_GCN_VZLUSAT2.pdf
GRB detectors on VZLUSAT-2 are a demonstration payload for a future
CubeSats constellation (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.