GRB250521A

This page lists all entries on GRB250521A in GRBweb

Summary Fermi GBM GCN 40508 GCN 40514 GCN 40541 GCN 40813

Summary table
Variable Value Source
GRB_name_Fermi GRB250521185
T0 4:27:02 UTC GCN_circulars,Fermi GBM final loc
ra 213.0100° Fermi_GBM
decl 30.0700° Fermi_GBM
pos_error 3.23e+00° Fermi_GBM
T90 27.904 s Fermi_GBM
T90_error 2.318 s Fermi_GBM
T90_start 4:27:02.882 UTC Fermi_GBM
fluence 9.17e-06 erg/cm² Fermi_GBM
fluence_error 4.21e-08 erg/cm² Fermi_GBM
T100 28.786 s
GBM_located True
mjd 60816.18543981481 GCN_circulars,Fermi GBM final loc
Fermi GBM table
GRB_name_Fermi GRB250521185
trigger_name bn250521185
ra 213.0100°
decl 30.0700°
pos_error 3.23e+00°
datum 2025-05-21
t_trigger 4:27:02.114 UTC
T90 27.904 s
T90_error 2.318 s
T90_start 4:27:02.882 UTC
fluence 9.17e-06 erg/cm²
fluence_error 4.21e-08 erg/cm²
flux_1024 4.36e+00 erg/cm²/s
flux_1024_error 2.34e-01 erg/cm²/s
flux_1024_time 7.68e-01 erg/cm²/s
flux_64 6.78e+00 erg/cm²/s
flux_64_error 1.06e+00 erg/cm²/s
GCN 40508 table
GRB_name GRB250521A
GCN_number 40508
Detection_method Fermi GBM final loc
t_trigger 4:27:02 UTC
ra 213.0000°
decl 30.1000°
Circular_text TITLE: GCN CIRCULAR NUMBER: 40508 SUBJECT: GRB 250521A: Fermi GBM Final Real-time Localization DATE: 25/05/21 04:37:01 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM The Fermi GBM team reports the detection of a likely LONG GRB At 04:27:02 UT on 21 May 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250521A (trigger 769494427.113864 / 250521185). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 213.0, Dec = 30.1 (J2000 degrees, equivalent to J2000 14h 11m, 30d 06'), with a statistical uncertainty of 4.6 degrees. The angle from the Fermi LAT boresight is 74.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250521185/quicklook/glg_skymap_all_bn250521185.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/bn250521185/quicklook/glg_healpix_all_bn250521185.fit The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250521185/quicklook/glg_lc_medres34_bn250521185.gif
GCN 40514 table
GRB_name GRB250521A
GCN_number 40514
Detection_method Fermi GBM Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 40514 SUBJECT: GRB 250521A: DDOTI Optical Upper Limit DATE: 25/05/21 17:03:34 GMT FROM: sahil.atri@students.uniroma2.eu Sahil Atri (U Roma), Rosa L. Becerra (U Roma), Alan M. Watson (UNAM), Camila Angulo Valdez (UNAM), Nat Butler (ASU), Simone Dichiara (Penn State University), Tsvetelina Dimitrova (ASU), Alexander Kutyrev (GSFC/UMD), William H. Lee (UNAM), Océlotl López (UNAM), Margarita Pereyra (UNAM) and Eleonora Troja (U Roma) report: We observed the field of the GRB 250521A detected by Fermi/GBM (Fermi GBM Team, GCN 40508) with the DDOTI/OAN wide-field imager at the Observatorio Astronómico Nacional on Sierra San Pedro Mártir (http://ddoti.astroscu.unam.mx) on the night of 2025-05-21 UTC. DDOTI observed the Fermi/GBM error region, covering about 93% of the error region (Fermi GBM Team, GCN Circ. 40508). DDOTI observed the field of GRB 250521A from 04:41 UTC to 11:25 UTC (from T+0.2 h to T+ 6.7 h after the trigger) and obtained a total exposure of 2.5 hours, alternating with other scientific programs. Comparing our observations to the USNO-B1 and Pan-STARRS PS1 DR2 catalogues, we detect no uncatalogued fading sources within the observed field to a 10-sigma limiting AB magnitude of: w > 20.91 This value is not corrected for the Galactic extinction. We thank the staff of the Observatorio Astronómico Nacional on the Sierra of San Pedro Mártir.
GCN 40541 table
GRB_name GRB250521A
GCN_number 40541
Detection_method Fermi GBM Det
t_trigger 4:27:02.600 UTC
Circular_text TITLE: GCN CIRCULAR NUMBER: 40541 SUBJECT: GRB 250521A: GRBAlpha detection DATE: 25/05/23 18:31:11 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, H. Takahashi (Hiroshima U.), L. Meszaros, B. Csak (Konkoly Observatory), N. Husarikova, F. Munz , M. Topinka, M. Duriskova, M. Kolar, 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 250521A (Fermi/GBM detection: GCN 40508) 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 2025-05-21 04:27:02.6 UTC. The T90 duration measured by GRBAlpha is 21 s and the overall significance during T90 reaches 8.6 sigma. The light curve obtained by GRBAlpha is available here: https://grbalpha.konkoly.hu/static/share/GRB250521A_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.
GCN 40813 table
GRB_name GRB250521A
GCN_number 40813
Detection_method Fermi GBM Det
t_trigger 4:27:04.888 UTC
Circular_text TITLE: GCN CIRCULAR NUMBER: 40813 SUBJECT: GRB 250521A: VZLUSAT-2 detection DATE: 25/06/23 15:09:37 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 long-duration GRB 250521A (Fermi/GBM detection: GCN 40508; GRBAlpha detection: GCN 40541; Wind/Konus detection trigger at 2025-05-21 04:27:04.888 UTC) was detected by the GRB detectors on board of the VZLUSAT-2 3U CubeSat (https://www.vzlusat2.cz/en/). The data acquisition was performed by the GRB detector units no. 0 and no. 1. The detection was confirmed at the peak time 2025-05-21 04:27:09 (04:27:02) UTC. The T90 duration is 33 s (35 s) and the significance during T90 reaches 10 sigma (15 sigma) for detector unit no. 0 (no. 1). The light curve obtained by VZLUSAT-2 is available here: https://vzlusat2.konkoly.hu/static/share/GRB250521A_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.