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This page lists all entries on GRB250204A in GRBweb

Summary Fermi GBM GCN 39138 GCN 39254

Summary table
Variable	Value	Source
GRB_name_Fermi	GRB250204311
T0	7:28:16.642 UTC	Fermi_GBM
ra	108.2300°	Fermi_GBM
decl	-23.7800°	Fermi_GBM
pos_error	2.97e+00°	Fermi_GBM
T90	39.425 s	Fermi_GBM
T90_error	2.111 s	Fermi_GBM
T90_start	7:28:16.642 UTC	Fermi_GBM
fluence	4.80e-06 erg/cm²	Fermi_GBM
fluence_error	2.71e-08 erg/cm²	Fermi_GBM
T100	39.425 s
GBM_located	True
mjd	60710.31130372685	Fermi_GBM

Fermi GBM table
GRB_name_Fermi	GRB250204311
trigger_name	bn250204311
ra	108.2300°
decl	-23.7800°
pos_error	2.97e+00°
datum	2025-02-04
t_trigger	7:28:17.410 UTC
T90	39.425 s
T90_error	2.111 s
T90_start	7:28:16.642 UTC
fluence	4.80e-06 erg/cm²
fluence_error	2.71e-08 erg/cm²
flux_1024	2.57e+00 erg/cm²/s
flux_1024_error	2.05e-01 erg/cm²/s
flux_1024_time	9.41e+00 erg/cm²/s
flux_64	4.22e+00 erg/cm²/s
flux_64_error	9.02e-01 erg/cm²/s

GCN 39138 table
GRB_name	GRB250204A
GCN_number	39138
Detection_method	Fermi GBM final loc
t_trigger	7:28:17 UTC
ra	108.2000°
decl	-23.8000°
Circular_text	TITLE: GCN CIRCULAR NUMBER: 39138 SUBJECT: GRB 250204A: Fermi GBM Final Real-time Localization DATE: 25/02/04 07:38:50 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM The Fermi GBM team reports the detection of a likely LONG GRB At 07:28:17 UT on 4 Feb 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250204A (trigger 760346902.4098 / 250204311). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 108.2, Dec = -23.8 (J2000 degrees, equivalent to J2000 07h 12m, -23d 48'), with a statistical uncertainty of 1.1 degrees. The angle from the Fermi LAT boresight is 9.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250204311/quicklook/glg_skymap_all_bn250204311.png The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250204311/quicklook/glg_healpix_all_bn250204311.fit The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250204311/quicklook/glg_lc_medres34_bn250204311.gif

GCN 39254 table
GRB_name	GRB250204A
GCN_number	39254
Detection_method	Fermi GBM Det
Circular_text	TITLE: GCN CIRCULAR NUMBER: 39254 SUBJECT: GRB 250204A: GRBAlpha detection DATE: 25/02/09 18:19:59 GMT FROM: Michaela Ďuríšková at Masaryk University <505876@mail.muni.cz> M. Duriskova, M. Dafcikova, J. Ripa, M. Kolar (Masaryk U.), A. Pal (Konkoly Observatory), N. Werner (Masaryk U.), M. Ohno, H. Takahashi (Hiroshima U.), L. Meszaros, B. Csak (Konkoly Observatory), N. Husarikova, F. Munz , M. Topinka, L. Szakszonova, J.-P. Breuer, F. Hroch (Masaryk U.), T. Urbanec, M. Kasal, A. Povalac (Brno U. of Technology), J. Hudec, J. Kapus, M. Frajt (Spacemanic s.r.o), R. Laszlo, M. Koleda (Needronix s.r.o), M. Smelko, P. Hanak, P. Lipovsky (Technical U. of Kosice), G. Galgoczi (Wigner Research Center/Eotvos U.), Y. Uchida, H. Poon, H. Matake (Hiroshima U.), N. Uchida (ISAS/JAXA), T. Bozoki (Eotvos U.), G. Dalya (Eotvos U.), T. Enoto (Kyoto U.), Zs. Frei (Eotvos U.), G. Friss (Eotvos U.), Y. Fukazawa, K. Hirose (Hiroshima U.), S. Hisadomi (Nagoya U.), Y. Ichinohe (Rikkyo U.), K. Kapas (Eotvos U.), L. L. Kiss (Konkoly Observatory), T. Mizuno (Hiroshima U.), K. Nakazawa (Nagoya U.), H. Odaka (Univ of Tokyo), J. Takatsy (Eotvos U.), K. Torigoe (Hiroshima U.), N. Kogiso, M. Yoneyama (Osaka Metropolitan U.), M. Moritaki (U. Tokyo), T. Kano (U. Michigan) -- the GRBAlpha collaboration. The long-duration GRB 250204A (Fermi/GBM detection: GCN 39138; INTEGRAL/SPI-ACS peak detection at 2025-02-04 ~07:28:17 UTC) was observed by the GRBAlpha 1U CubeSat (Pal et al. 2023, A&A, 677, 40; https://ui.adsabs.harvard.edu/abs/2023A%26A...677A..40P/abstract). The detection was confirmed at the peak time 2025-02-04 07:28:19.6 UTC. The T90 duration measured by GRBAlpha is 33.5 s and the overall significance during T90 reaches 9.9 sigma. The light curve obtained by GRBAlpha is available here: https://grbalpha.konkoly.hu/static/share/GRB250204A_GCN.pdf All GRBAlpha detections are listed at: https://monoceros.physics.muni.cz/hea/GRBAlpha/ GRBAlpha, launched on 2021 March 22, is a demonstration mission for a future CubeSat constellation (Werner et al. Proc. SPIE 2018). The detector of GRBAlpha consists of a 75 x 75 x 5 mm3 CsI scintillator read out by a SiPM array, covering the energy range from ~50 keV to ~1000 keV. To increase the duty cycle and the downlink rate, the upgrade of the on-board data acquisition software stack is in progress. The ground segment is also supported by the radio amateur community and it takes advantage of the SatNOGS network for increased data downlink volume.