GRB250331E

This page lists all entries on GRB250331E in GRBweb

Summary Fermi GBM GCN 39988 GCN 39991 GCN 40007

Summary table
Variable Value Source
GRB_name_Fermi GRB250331949
T0 22:46:31.252 UTC Fermi_GBM
ra 196.6000° GCN_circulars,Optical
decl -27.7000° GCN_circulars,Optical
T90 69.888 s Fermi_GBM
T90_error 15.924 s Fermi_GBM
T90_start 22:46:31.252 UTC Fermi_GBM
fluence 9.88e-07 erg/cm² Fermi_GBM
fluence_error 3.40e-08 erg/cm² Fermi_GBM
T100 69.888 s
GBM_located False
mjd 60765.94897282407 Fermi_GBM
Fermi GBM table
GRB_name_Fermi GRB250331949
trigger_name bn250331949
ra 196.6400°
decl -27.6700°
pos_error 8.12e+00°
datum 2025-03-31
t_trigger 22:46:32.788 UTC
T90 69.888 s
T90_error 15.924 s
T90_start 22:46:31.252 UTC
fluence 9.88e-07 erg/cm²
fluence_error 3.40e-08 erg/cm²
flux_1024 1.33e+00 erg/cm²/s
flux_1024_error 1.89e-01 erg/cm²/s
flux_1024_time -6.40e-01 erg/cm²/s
flux_64 3.11e+00 erg/cm²/s
flux_64_error 1.11e+00 erg/cm²/s
GCN 39988 table
GRB_name GRB250331E
GCN_number 39988
Detection_method Fermi GBM final loc
t_trigger 22:46:32 UTC
ra 196.6000°
decl -27.7000°
Circular_text TITLE: GCN CIRCULAR NUMBER: 39988 SUBJECT: GRB 250331E: Fermi GBM Final Real-time Localization DATE: 25/03/31 22:57:04 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM The Fermi GBM team reports the detection of a likely LONG GRB At 22:46:32 UT on 31 Mar 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250331E (trigger 765153997.78765 / 250331949). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 196.6, Dec = -27.7 (J2000 degrees, equivalent to J2000 13h 06m, -27d 41'), with a statistical uncertainty of 14.0 degrees. The angle from the Fermi LAT boresight is 73.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250331949/quicklook/glg_skymap_all_bn250331949.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/bn250331949/quicklook/glg_healpix_all_bn250331949.fit The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250331949/quicklook/glg_lc_medres34_bn250331949.gif
GCN 39991 table
GRB_name GRB250331E
GCN_number 39991
Detection_method Fermi GBM Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 39991 SUBJECT: Fermi GRB 250331E: Global MASTER-Net observations report DATE: 25/04/01 01:16:06 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 250331E ( Fermi GBM team, GCN 39988) errorbox 4 sec after trigger time at 2025-03-31 22:46:37 UT, with upper limit up to 19.3 mag. The observations began at zenith distance = 12 deg. The sun altitude is -62.4 deg. The galactic latitude b = 35 deg., longitude l = 308 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2829592 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 35 | 2025-03-31 22:46:37 | MASTER-SAAO | (12h 57m 48.00s , -20d 04m 42.7s) | C | 60 | 19.0 | 114 | 2025-03-31 22:47:56 | MASTER-SAAO | (13h 06m 14.94s , -20d 06m 25.5s) | C | 60 | 19.1 | 1229 | 2025-03-31 23:06:32 | MASTER-SAAO | (13h 25m 08.68s , -32d 04m 39.4s) | C | 60 | 19.0 | 1388 | 2025-03-31 23:09:10 | MASTER-SAAO | (13h 34m 31.38s , -32d 07m 08.5s) | C | 60 | 19.2 | 2434 | 2025-03-31 23:26:37 | MASTER-SAAO | (13h 25m 13.32s , -32d 05m 29.0s) | C | 60 | 19.2 | 2593 | 2025-03-31 23:29:15 | MASTER-SAAO | (14h 07m 32.41s , -36d 55m 59.7s) | C | 60 | 19.3 | 3468 | 2025-03-31 23:43:50 | MASTER-SAAO | (14h 07m 42.96s , -36d 54m 45.6s) | C | 60 | 19.1 | 4282 | 2025-03-31 23:57:24 | MASTER-SAAO | (14h 07m 44.51s , -36d 53m 28.5s) | C | 60 | 19.1 | 5764 | 2025-04-01 00:22:06 | MASTER-SAAO | (14h 07m 53.30s , -36d 53m 01.5s) | C | 60 | 19.1 | 6499 | 2025-04-01 00:34:21 | MASTER-SAAO | (14h 07m 57.57s , -36d 54m 12.1s) | C | 60 | 19.2 | 7157 | 2025-04-01 00:45:19 | MASTER-SAAO | (14h 07m 59.18s , -36d 53m 44.9s) | C | 60 | 19.1 | 7236 | 2025-04-01 00:46:38 | MASTER-SAAO | (13h 35m 38.73s , -27d 21m 54.8s) | C | 60 | 19.1 | 7315 | 2025-04-01 00:47:58 | MASTER-SAAO | (13h 44m 37.58s , -27d 21m 15.5s) | C | 60 | 19.3 | 7474 | 2025-04-01 00:50:36 | MASTER-SAAO | (13h 22m 32.82s , -25d 27m 53.6s) | C | 60 | 19.3 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.
GCN 40007 table
GRB_name GRB250331E
GCN_number 40007
Detection_method Optical
ra 196.6000°
decl -27.7000°
Circular_text TITLE: GCN CIRCULAR NUMBER: 40007 SUBJECT: GRB 250331E: SVOM/GRM observation DATE: 25/04/02 08:09:11 GMT FROM: Yue Wang SVOM/GRM team: Yue Wang, Chen-Wei Wang, Shi-Jie Zheng, Yue Huang, Shao-Lin Xiong, Shuang-Nan Zhang (IHEP) SVOM/ECLAIRs team: Frédéric Daigne (IAP), Frédéric Piron (LUPM), Nicolas Dagoneau (CEA) Report on behalf of the SVOM team: SVOM/GRM was triggered in-flight by GRB 250331E (SVOM trigger reference: sb25033103) at 2025-03-31T22:46:35.000 (T0). This burst was also detected by Fermi/GBM (Fermi GBM Team, GCN 39988). 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 12.0 +1.0/-2.0 s in the 15-5000 keV band. In addition, ECLAIRs was taking data and did not trigger, since the position of this burst, as determined by Fermi/GBM (GCN 39988, RA: 196.6 deg, DEC: -27.7 deg, Error: 14.0 deg), is located at about 60.7 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/svgrb250331E.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)