GCN Circular 31803
Subject
GRB 220320A: Detection by VZLUSAT-2
Date
2022-03-29T04:06:06Z (3 years ago)
From
Jakub Ripa at Masaryk University <ripa.jakub@mail.muni.cz>
J. Ripa (Masaryk U.), A. Pal (Konkoly Observatory), M. Ohno (Eotvos
U./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.
The bright, long-duration GRB 220320A (AstroSat-CZTI detection:
Gopalakrishnan et al., GCN Circ. 31779; localized by IPN: Kozyrev et al.
GCN Circ. 31783 and detected also by Fermi/GBM trigger 669443999,
CALET/CGBM trigger 1331786356, Konus-Wind, INTEGRAL/SPI-ACS at about
04:39:54 UT) was also detected by one of the two GRB detectors on board
of the VZLUSAT-2 3U CubeSat (https://www.vzlusat2.cz/en/).
This is the first time that a GRB was observed by the VZLUSAT-2 3U CubeSat.
The data acquisition was performed by GRB detector unit no. 1 (the unit
no. 0 was turned off). The detector was performing a several hours long
background monitoring survey with 15 s temporal resolution, which is not
optimal for GRB search. Much finer resolution is planned for the nominal
operation. The 46 sigma detection significance was confirmed at around
04:39:55 UTC.
The light curve obtained by VZLUSAT-2 is available here:
https://vzlusat2.konkoly.hu/static/share/GRB220320A_GCN_VZLUSAT_2.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.