GRB 230410B

F. Verrecchia (SSDC, and INAF/OAR), C. Casentini (INAF/IAPS), M. Tavani
(INAF/IAPS and Uni. Roma Tor Vergata), C. Pittori, F. Lucarelli (SSDC,
and INAF/OAR), A. Argan, M. Cardillo, Y. Evangelista, L. Foffano,
G. Piano (INAF/IAPS), A. Addis, L. Baroncelli, A. Bulgarelli, A. Di
Piano, V. Fioretti, G.Panebianco, N. Parmiggiani (INAF/OAS-Bologna),
M. Romani (INAF/OA-Brera), M. Marisaldi (INAF/OAS-Bologna, Bergen
University), M. Pilia, A. Trois (INAF/OA Cagliari), I. Donnarumma,
E. Menegoni, A.Ursi (ASI), A. Giuliani (INAF/IASF-Mi) and P. Tempesta
(TeleSpazio), report on behalf of the AGILE Team:

The AGILE Mini-CALorimeter (MCAL) detected a short burst at
T0 = 2023-04-10 04:31:20.09 �� 0.01 s (UTC).
The event lasted 0.13 s and released a total number of 227 counts in the
MCAL detector (in the 0.4-100 MeV energy range), above a background rate
of 537 Hz. The MCAL light curve can be found at:
https://tools.ssdc.asi.it/ImgView/Agile/GRB230410B_083053_60818588008894555 
.

The burst is also clearly visible in the AGILE scientific ratemeters of
the MCAL detector (0.4-100 MeV), and marginally in that of the
AntiCoincidence (AC; 50-200 keV) detectors.

The event lasted about 1 s and it released a total number of 1690 counts
in the MCAL detector (above a background rate of 1109 Hz), 7078
counts in AC-Top detector (above a background rate of 3263 Hz), and
7271 counts in AC-Lat1 detector (above a background rate of 3171 Hz).
The AGILE ratemeters light curves can be found at
https://tools.ssdc.asi.it/ImgView/Agile/GRB230410B_AGILE_RM_D357 .

Additional analysis of AGILE data is in progress. Automatic MCAL GRB alert
Notices can be found at: https://gcn.gsfc.nasa.gov/agile_mcal.html

M. Dafcikova, 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, 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 short duration GRB 230410B (AGILE/MCAL detection: GCN 33604
Loading...
 
 ; GECAM-B
detection: trigger no. 172) 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 the GRB detector unit no. 1 with a
temporal resolution of 1 s. The light curve shows a spike within one bin at
2023-04-10 04:31:18 UTC. The detection significance reaches 9 sigma.

The light curve obtained by VZLUSAT-2 is available here:

https://vzlusat2.konkoly.hu/static/share/GRB230410B_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
CubeSat 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.