GRB250309A

This page lists all entries on GRB250309A in GRBweb

Summary Fermi GBM GCN 39623 GCN 39640

Summary table
Variable Value Source
GRB_name_Fermi GRB250309029
T0 0:42:03 UTC GCN_circulars,Fermi GBM final loc
ra 46.6600° Fermi_GBM
decl 58.0200° Fermi_GBM
pos_error 1.42e+01° Fermi_GBM
T90 2.24 s Fermi_GBM
T90_error 0.41 s Fermi_GBM
T90_start 0:42:03.081 UTC Fermi_GBM
fluence 4.03e-08 erg/cm² Fermi_GBM
fluence_error 8.96e-09 erg/cm² Fermi_GBM
T100 2.321 s
GBM_located True
mjd 60743.02920138889 GCN_circulars,Fermi GBM final loc
Fermi GBM table
GRB_name_Fermi GRB250309029
trigger_name bn250309029
ra 46.6600°
decl 58.0200°
pos_error 1.42e+01°
datum 2025-03-09
t_trigger 0:42:03.785 UTC
T90 2.24 s
T90_error 0.41 s
T90_start 0:42:03.081 UTC
fluence 4.03e-08 erg/cm²
fluence_error 8.96e-09 erg/cm²
flux_1024 5.20e-01 erg/cm²/s
flux_1024_error 1.84e-01 erg/cm²/s
flux_1024_time -8.96e-01 erg/cm²/s
flux_64 2.04e+00 erg/cm²/s
flux_64_error 9.01e-01 erg/cm²/s
GCN 39623 table
GRB_name GRB250309A
GCN_number 39623
Detection_method Fermi GBM final loc
t_trigger 0:42:03 UTC
ra 46.7000°
decl 58.0000°
Circular_text TITLE: GCN CIRCULAR NUMBER: 39623 SUBJECT: GRB 250309A: Fermi GBM Final Real-time Localization DATE: 25/03/09 00:53:02 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM The Fermi GBM team reports the detection of a likely SHORT GRB At 00:42:03 UT on 9 Mar 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250309A (trigger 763173728.785018 / 250309029). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 46.7, Dec = 58.0 (J2000 degrees, equivalent to J2000 03h 06m, 58d 00'), with a statistical uncertainty of 22.9 degrees. The angle from the Fermi LAT boresight is 22.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250309029/quicklook/glg_skymap_all_bn250309029.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/bn250309029/quicklook/glg_healpix_all_bn250309029.fit The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250309029/quicklook/glg_lc_medres34_bn250309029.gif
GCN 39640 table
GRB_name GRB250309A
GCN_number 39640
Detection_method Fermi GBM Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 39640 SUBJECT: Fermi GRB 250309A: Global MASTER-Net observations report DATE: 25/03/09 22:31:05 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-Kislovodsk robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) started inspect of the Fermi GRB 250309A ( Fermi GBM team, GCN 39623) errorbox 71845 sec after notice time and 71879 sec after trigger time at 2025-03-09 20:40:03 UT, with upper limit up to 16.2 mag. The observations began at zenith distance = 81 deg. The sun altitude is -50.2 deg. The galactic latitude b = 0 deg., longitude l = 140 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2805313 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 71900 | 2025-03-09 20:40:03 | MASTER-Kislovodsk | (02h 47m 28.83s , +38d 43m 03.4s) | C | 40 | 15.5 | 71955 | 2025-03-09 20:40:03 | MASTER-Kislovodsk | (02h 47m 28.84s , +38d 43m 03.3s) | C | 150 | 16.2 | Coadd 71965 | 2025-03-09 20:41:03 | MASTER-Kislovodsk | (02h 47m 28.70s , +38d 42m 52.8s) | C | 50 | 15.4 | 72040 | 2025-03-09 20:42:13 | MASTER-Kislovodsk | (02h 47m 28.63s , +38d 42m 43.8s) | C | 60 | 15.6 | 72130 | 2025-03-09 20:43:33 | MASTER-Kislovodsk | (02h 47m 28.55s , +38d 42m 35.0s) | C | 80 | 15.7 | 72240 | 2025-03-09 20:43:33 | MASTER-Kislovodsk | (02h 47m 28.54s , +38d 42m 34.9s) | C | 300 | 16.1 | Coadd 72240 | 2025-03-09 20:45:13 | MASTER-Kislovodsk | (02h 47m 28.42s , +38d 42m 25.5s) | C | 100 | 15.8 | 72370 | 2025-03-09 20:47:13 | MASTER-Kislovodsk | (02h 47m 28.29s , +38d 42m 16.6s) | C | 120 | 15.7 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.