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TITLE:   GCN CIRCULAR
NUMBER:  33006
SUBJECT: GRB 221202B: Fermi GBM Final Real-time Localization
DATE:    22/12/02 21:52:14 GMT
FROM:    Fermi GBM Team at MSFC/Fermi-GBM  <do_not_reply@GIOC.nsstc.nasa.gov>

The Fermi GBM team reports the detection of a likely LONG GRB

At 21:41:52 UT on 2 Dec 2022, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 221202B (trigger 691710117.068684 / 221202904).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 346.4, Dec = -3.1 (J2000 degrees, equivalent to J2000 23h 05m, -3d 06'), with a statistical uncertainty of 1.2 degrees.

The angle from the Fermi LAT boresight is 82.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn221202904/quicklook/glg_skymap_all_bn221202904.png

The HEALPix FITS file, including the estimated localization systematic, can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn221202904/quicklook/glg_healpix_all_bn221202904.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn221202904/quicklook/glg_lc_medres34_bn221202904.gif

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TITLE:   GCN CIRCULAR
NUMBER:  33019
SUBJECT: GRB 221202B: Detection by VZLUSAT-2
DATE:    22/12/04 13:08:54 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.

A long-duration GRB 221202B (Fermi/GBM detection: The Fermi GBM team, 
GCN Circ. 33006; Konus-Wind detection trigger time at 2022-12-02 
21:41:58.66 UT; INTEGRAL/SPI-ACS detection peak at ~2022-12-02 21:42:00 
UT) was marginally 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 
marginal detection shows the peak time 2022-12-02 21:42:03 UTC. The T90 
duration was measured to be 20 s with the light curve resolution of 1 s. 
The significance during T90 reaches 5.4 sigma.

The light curve obtained by VZLUSAT-2 is available here:
https://vzlusat2.konkoly.hu/static/share/GRB221202B_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.