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This page lists all entries on GRB230521A in GRBweb

Summary Fermi GBM GCN 33839 GCN 33846 GCN 33906

Summary table
Variable	Value	Source
GRB_name_Fermi	GRB230521211
T0	5:03:23 UTC	GCN_circulars,Fermi GBM final loc
ra	37.0400°	Fermi_GBM
decl	7.5600°	Fermi_GBM
pos_error	1.15e+01°	Fermi_GBM
T90	0.512 s	Fermi_GBM
T90_error	1.691 s	Fermi_GBM
T90_start	5:03:23.477 UTC	Fermi_GBM
fluence	1.59e-07 erg/cm²	Fermi_GBM
fluence_error	1.09e-08 erg/cm²	Fermi_GBM
T100	0.989 s
GBM_located	True
mjd	60085.21068287037	GCN_circulars,Fermi GBM final loc

Fermi GBM table
GRB_name_Fermi	GRB230521211
trigger_name	bn230521211
ra	37.0400°
decl	7.5600°
pos_error	1.15e+01°
datum	2023-05-21
t_trigger	5:03:23.733 UTC
T90	0.512 s
T90_error	1.691 s
T90_start	5:03:23.477 UTC
fluence	1.59e-07 erg/cm²
fluence_error	1.09e-08 erg/cm²
flux_1024	2.00e+00 erg/cm²/s
flux_1024_error	2.03e-01 erg/cm²/s
flux_1024_time	-7.04e-01 erg/cm²/s
flux_64	8.42e+00 erg/cm²/s
flux_64_error	1.38e+00 erg/cm²/s

GCN 33839 table
GRB_name	GRB230521A
GCN_number	33839
Detection_method	Fermi GBM final loc
t_trigger	5:03:23 UTC
ra	37.0000°
decl	7.6000°
Circular_text	TITLE: GCN CIRCULAR NUMBER: 33839 SUBJECT: GRB 230521A: Fermi GBM Final Real-time Localization DATE: 23/05/21 05:13:46 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM The Fermi GBM team reports the detection of a likely SHORT GRB At 05:03:23 UT on 21 May 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 230521A (trigger 706338208.733194 / 230521211). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 37.0, Dec = 7.6 (J2000 degrees, equivalent to J2000 02h 28m, 7d 35'), with a statistical uncertainty of 7.8 degrees. The angle from the Fermi LAT boresight is 54.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230521211/quicklook/glg_skymap_all_bn230521211.png The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230521211/quicklook/glg_healpix_all_bn230521211.fit The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230521211/quicklook/glg_lc_medres34_bn230521211.gif

GCN 33846 table
GRB_name	GRB230521A
GCN_number	33846
Detection_method	Fermi GBM Other
Circular_text	TITLE: GCN CIRCULAR NUMBER: 33846 SUBJECT: Fermi Gamma-ray Burst Monitor trigger 706338208/230521211 is not a GRB DATE: 23/05/22 00:19:06 GMT FROM: Stephen Lesage at Fermi-GBM Team S. Lesage (UAH) reports on behalf of the Fermi Gamma-ray Burst Monitor Team: "The Fermi Gamma-ray Burst Monitor (GBM) trigger 706338208/230521211 at 05:03:23 UT on 21 May 2023, tentatively classified as GRB 230521A (GCN 33839), is in fact not due to a GRB. This trigger is likely due to Uncertain."

GCN 33906 table
GRB_name	GRB230521A
GCN_number	33906
Detection_method	INTEGRAL
Circular_text	TITLE: GCN CIRCULAR NUMBER: 33906 SUBJECT: GRB 230521A: VZLUSAT-2 detection DATE: 23/06/02 17:43:46 GMT FROM: Marianna Dafčíková at Masaryk University <500025@mail.muni.cz> 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 GRB detectors on board of the VZLUSAT-2 3U CubeSat (https://www.vzlusat2.cz/en/) detected a likely long-duration GRB 230521A. The event was triggered by Konus/Wind at 2023-05-21 18:52:04.019 UT and also observed by INTEGRAL/SPI-ACS at 2023-05-21 18:52:13 UT. The GOES-P X-ray flux does not show any increase at the time of this detection, therefore, it is unlikely to be a solar flare. The data acquisition was performed by the GRB detector units no. 0 and no. 1. The detection was confirmed at the peak time 2023-05-21 18:52:10 UTC. The T90 duration is 45 s (46 s) and the significance during T90 reaches 11 sigma (16 sigma) for detector unit no. 0 (no. 1). The light curve obtained by VZLUSAT-2 is available here: https://vzlusat2.konkoly.hu/static/share/GRB230521A_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.