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This page lists all entries on GRB250330B in GRBweb

Summary Fermi GBM GCN 39951 GCN 39952 GCN 39989 GCN 39993 GCN 40235

Summary table
Variable	Value	Source
GRB_name_Fermi	GRB250330911
T0	21:52:22 UTC	GCN_circulars,Fermi GBM final loc
ra	114.1000°	GCN_circulars,Optical
decl	13.3000°	GCN_circulars,Optical
T90	0.448 s	Fermi_GBM
T90_error	0.101 s	Fermi_GBM
T90_start	21:52:22.071 UTC	Fermi_GBM
fluence	1.48e-06 erg/cm²	Fermi_GBM
fluence_error	1.07e-08 erg/cm²	Fermi_GBM
T100	0.519 s
GBM_located	False
mjd	60764.91136574074	GCN_circulars,Fermi GBM final loc

Fermi GBM table
GRB_name_Fermi	GRB250330911
trigger_name	bn250330911
ra	114.0700°
decl	13.3400°
pos_error	4.25e+00°
datum	2025-03-30
t_trigger	21:52:22.103 UTC
T90	0.448 s
T90_error	0.101 s
T90_start	21:52:22.071 UTC
fluence	1.48e-06 erg/cm²
fluence_error	1.07e-08 erg/cm²
flux_1024	6.77e+00 erg/cm²/s
flux_1024_error	2.61e-01 erg/cm²/s
flux_1024_time	-2.56e-01 erg/cm²/s
flux_64	3.23e+01 erg/cm²/s
flux_64_error	1.63e+00 erg/cm²/s

GCN 39951 table
GRB_name	GRB250330B
GCN_number	39951
Detection_method	Fermi GBM final loc
t_trigger	21:52:22 UTC
ra	114.1000°
decl	13.3000°
Circular_text	TITLE: GCN CIRCULAR NUMBER: 39951 SUBJECT: GRB 250330B: Fermi GBM Final Real-time Localization DATE: 25/03/30 22:03:10 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM The Fermi GBM team reports the detection of a likely SHORT GRB At 21:52:22 UT on 30 Mar 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250330B (trigger 765064347.102666 / 250330911). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 114.1, Dec = 13.3 (J2000 degrees, equivalent to J2000 07h 36m, 13d 18'), with a statistical uncertainty of 3.1 degrees. The angle from the Fermi LAT boresight is 81.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250330911/quicklook/glg_skymap_all_bn250330911.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/bn250330911/quicklook/glg_healpix_all_bn250330911.fit The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250330911/quicklook/glg_lc_medres34_bn250330911.gif

GCN 39952 table
GRB_name	GRB250330B
GCN_number	39952
Detection_method	Fermi GBM Other
Circular_text	TITLE: GCN CIRCULAR NUMBER: 39952 SUBJECT: Fermi GRB 250330B: Global MASTER-Net observations report DATE: 25/03/30 23:15:59 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V.Lipunov, E.Gorbovskoy, N.Tiurina, P.Balanutsa, , D.Vlasenko, I.Panchenko, A.Kuznetsov, G.Antipov, A.Sankovich, A.Sosnovskij, Yu.Tselik, M.Gulyaev, Ya.Kechin, V.Senik, A.Chasovnikov, K.Labsina, I. Gorbunov (Lomonosov MSU), O.Gress, N.Budnev (ISU), C.Francile, F. Podesta, R.Podesta, E. Gonzalez (Observatorio Astronomico Felix Aguilar (OAFA), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), A. Gabovich, V.Yurkov (Blagoveschensk Educational StateUniversity) D.Buckley (SAAO), R.Rebolo (The Instituto de Astrofisica de Canarias), L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory) MASTER-SAAO robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in South Africa (South African Astronomical Observatory) started inspect of the Fermi GRB 250330B ( Fermi GBM team, GCN 39951) errorbox 54 sec after notice time and 92 sec after trigger time at 2025-03-30 21:53:54 UT, with upper limit up to 17.4 mag. The observations began at zenith distance = 77 deg. The sun altitude is -59.7 deg. The galactic latitude b = 16 deg., longitude l = 206 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2828695 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 102 | 2025-03-30 21:53:54 | MASTER-SAAO | (07h 22m 19.10s , +12d 01m 03.3s) | C | 20 | 17.1 | 141 | 2025-03-30 21:54:33 | MASTER-SAAO | (07h 22m 19.82s , +12d 01m 05.9s) | C | 20 | 17.0 | 186 | 2025-03-30 21:55:12 | MASTER-SAAO | (07h 22m 20.65s , +12d 01m 08.5s) | C | 30 | 17.1 | 240 | 2025-03-30 21:56:01 | MASTER-SAAO | (07h 22m 21.73s , +12d 01m 11.2s) | C | 40 | 17.0 | 304 | 2025-03-30 21:57:00 | MASTER-SAAO | (07h 22m 23.03s , +12d 01m 14.3s) | C | 50 | 16.9 | 378 | 2025-03-30 21:58:10 | MASTER-SAAO | (07h 22m 24.54s , +12d 01m 18.1s) | C | 60 | 16.9 | 629 | 2025-03-30 22:02:21 | MASTER-SAAO | (07h 36m 00.30s , +13d 19m 14.0s) | C | 60 | 17.4 | 709 | 2025-03-30 22:03:40 | MASTER-SAAO | (07h 36m 01.77s , +13d 19m 17.5s) | C | 60 | 17.4 | 788 | 2025-03-30 22:04:59 | MASTER-SAAO | (07h 36m 03.30s , +13d 19m 20.6s) | C | 60 | 17.4 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.

GCN 39989 table
GRB_name	GRB250330B
GCN_number	39989
Detection_method	Fermi GBM Other
Circular_text	TITLE: GCN CIRCULAR NUMBER: 39989 SUBJECT: GRB 250330B: EIRSAT-1 GMOD Detection DATE: 25/03/31 23:14:24 GMT FROM: David Murphy at University College Dublin D. Murphy, J. Fisher, C. de Barra, P. McDermott, C. McKenna, A. Ulyanov, G. Finneran, G. Corcoran, L. Cotter, A. Empey, F. Gibson Kiely, J. Thompson, D. McKeown, A. Martin-Carrillo, L. Hanlon, S. McBreen, on behalf of the EIRSAT-1 team: EIRSAT-1 reports the detection of the short gamma-ray burst GRB 250330B by the Gamma-ray Module (GMOD) instrument, which was also detected by Fermi GBM (GCN [39951](https://gcn.nasa.gov/circulars/39951)). The GMOD detection was made starting at 2025-03-30 21:52:22.4 UTC. The GMOD light curve for GRB250330B, with 1.2s binning, shows a single peak, consistent with the detection by Fermi GBM. The spacecraft location at time of detection was 1.704 S, 7.769 E and an altitude of 407.7 km. The light curve for this event as measured by GMOD can be found here: https://grb.eirsat1.ie/250330B/250330B_LC_onboard_preliminary.png EIRSAT-1 is Ireland’s first satellite ([Doyle et al. Proceedings of the 4th SSEA, 2022](https://researchrepository.ucd.ie/bitstreams/2f3fdccb-6e36-4ac1-88cd-4e80feecf446/download)). It is a 2U CubeSat and carries onboard a number of experiments including the Gamma-Ray Module (GMOD), a novel, compact, gamma-ray detector ([Murphy et al, Experimental Astronomy, 53, 961–990, 2022](https://link.springer.com/article/10.1007/s10686-022-09842-z)). GMOD consists of a 25 mm × 25 mm × 40 mm Cerium Bromide scintillator coupled to SiPMs and is designed to detect gamma-ray bursts in the ~ 60 keV - 1.5 MeV range. EIRSAT-1 was developed in University College Dublin with support from ESA’s Fly Your Satellite! programme and was launched on 1st December 2023.

GCN 39993 table
GRB_name	GRB250330B
GCN_number	39993
Detection_method	Optical
ra	114.1000°
decl	13.3000°
Circular_text	TITLE: GCN CIRCULAR NUMBER: 39993 SUBJECT: GRB 250330B: SVOM/GRM observation of a short burst DATE: 25/04/01 04:33:43 GMT FROM: Yue Wang SVOM/GRM team: Yue Wang, Chen-Wei Wang, Jia-Cong Liu, Shi-Jie Zheng, Yue Huang, Shao-Lin Xiong, Shuang-Nan Zhang (IHEP) SVOM/ECLAIRs team: O. Godet, Jean-Luc Atteia (IRAP), Frédéric Piron (LUPM), Stéphane Schanne (CEA) Report on behalf of the SVOM team: SVOM/GRM was triggered in-flight by GRB 250330B (SVOM trigger reference: sb25033007) at 2025-03-30T21:52:22.100 (T0). This burst was also detected by Fermi/GBM (Fermi GBM Team, GCN 39951). With the event-by-event data downloaded through the X-band ground station, the GRM light curve shows that this burst consists of single main pulse with a T90 of 0.48 +0.32/-0.11 s in the 15-5000 keV band. In addition, ECLAlRs was taking data and did not trigger, since the position of this burst, as determined by Fermi/GBM (GCN 39951, RA: 114.1 deg, DEC: 13.3 deg, Error: 3.1 deg), is located at about 96.2 degrees from the SVOM optical axis, and outside the ECLAIRs field of view. The SVOM/GRM light curve can be found here: https://www.bursthub.cn//admin/static/svgrb250330B.png The Space Variable Objects Monitor (SVOM) is a China-France joint mission led by the Chinese National Space Administration (CNSA, China), National Center for Space Studies (CNES, France) and the Chinese Academy of Sciences (CAS, China), which is dedicated to observing gamma-ray bursts and other transient phenomena in the energetic universe. GRM is developed by the Institute of High Energy Physics (IHEP) of CAS. The SVOM/GRM point of contact for this burst is: Yue Wang (IHEP) (yuewang@ihep.ac.cn)

GCN 40235 table
GRB_name	GRB250330B
GCN_number	40235
Detection_method	Fermi GBM Det
t_trigger	21:52:22.793 UTC
Circular_text	TITLE: GCN CIRCULAR NUMBER: 40235 SUBJECT: GRB 250330B: GRBAlpha detection DATE: 25/04/24 14:56:21 GMT FROM: Jakub Ripa J. Ripa, M. Dafcikova (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 short-duration GRB 250330B (Fermi/GBM detection: GCN 39951; EIRSAT-1/GMOD detection: GCN 39989; SVOM/GRM detection: GCN 39993; Wind/Konus detection trigger at 2025-03-30 21:52:22.793 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 2025-03-30 21:52:21.7 UTC. The T90 duration measured by GRBAlpha is 1.0 s and the overall significance during T90 reaches 6.8 sigma. The light curve obtained by GRBAlpha is available here: https://grbalpha.konkoly.hu/static/share/GRB250330B_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.