GRB250307A

This page lists all entries on GRB250307A in GRBweb

Summary Fermi GBM GCN 39618 GCN 39620

Summary table
Variable Value Source
GRB_name_Fermi GRB250307832
T0 19:57:53 UTC GCN_circulars,Fermi GBM final loc
ra 265.6400° Fermi_GBM
decl 2.2100° Fermi_GBM
pos_error 3.14e+00° Fermi_GBM
T90 11.837 s Fermi_GBM
T90_error 1.072 s Fermi_GBM
T90_start 19:57:53.737 UTC Fermi_GBM
fluence 3.96e-06 erg/cm² Fermi_GBM
fluence_error 3.94e-08 erg/cm² Fermi_GBM
T100 12.574 s
GBM_located True
mjd 60741.83186342593 GCN_circulars,Fermi GBM final loc
Fermi GBM table
GRB_name_Fermi GRB250307832
trigger_name bn250307832
ra 265.6400°
decl 2.2100°
pos_error 3.14e+00°
datum 2025-03-07
t_trigger 19:57:53.734 UTC
T90 11.837 s
T90_error 1.072 s
T90_start 19:57:53.737 UTC
fluence 3.96e-06 erg/cm²
fluence_error 3.94e-08 erg/cm²
flux_1024 7.18e+00 erg/cm²/s
flux_1024_error 3.16e-01 erg/cm²/s
flux_1024_time 5.76e-01 erg/cm²/s
flux_64 9.81e+00 erg/cm²/s
flux_64_error 1.42e+00 erg/cm²/s
GCN 39618 table
GRB_name GRB250307A
GCN_number 39618
Detection_method Fermi GBM final loc
t_trigger 19:57:53 UTC
ra 265.6000°
decl 2.2000°
Circular_text TITLE: GCN CIRCULAR NUMBER: 39618 SUBJECT: GRB 250307A: Fermi GBM Final Real-time Localization DATE: 25/03/07 20:08:14 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM The Fermi GBM team reports the detection of a likely LONG GRB At 19:57:53 UT on 7 Mar 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250307A (trigger 763070278.733804 / 250307832). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 265.6, Dec = 2.2 (J2000 degrees, equivalent to J2000 17h 42m, 2d 12'), with a statistical uncertainty of 2.7 degrees. The angle from the Fermi LAT boresight is 82.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250307832/quicklook/glg_skymap_all_bn250307832.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/bn250307832/quicklook/glg_healpix_all_bn250307832.fit The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250307832/quicklook/glg_lc_medres34_bn250307832.gif
GCN 39620 table
GRB_name GRB250307A
GCN_number 39620
Detection_method Fermi GBM Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 39620 SUBJECT: Fermi GRB 250307A: Global MASTER-Net observations report DATE: 25/03/08 00:30:39 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 250307A ( Fermi GBM team, GCN 39618) errorbox 12559 sec after notice time and 12601 sec after trigger time at 2025-03-07 23:27:54 UT, with upper limit up to 17.9 mag. The observations began at zenith distance = 70 deg. The sun altitude is -42.9 deg. The galactic latitude b = 16 deg., longitude l = 27 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2803750 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 12631 | 2025-03-07 23:27:54 | MASTER-Kislovodsk | (17h 39m 34.52s , +03d 16m 16.2s) | C | 60 | 16.0 | 13390 | 2025-03-07 23:40:34 | MASTER-Kislovodsk | (17h 47m 30.44s , +03d 15m 20.9s) | C | 60 | 16.9 | 13470 | 2025-03-07 23:41:53 | MASTER-Kislovodsk | (17h 39m 36.28s , +03d 16m 01.7s) | C | 60 | 17.1 | 13550 | 2025-03-07 23:43:13 | MASTER-Kislovodsk | (17h 38m 11.65s , +01d 21m 58.9s) | C | 60 | 16.9 | 15377 | 2025-03-08 00:13:10 | MASTER-Kislovodsk | (17h 40m 28.55s , +02d 25m 26.0s) | C | 120 | 17.0 | 15517 | 2025-03-08 00:15:30 | MASTER-Kislovodsk | (17h 40m 32.95s , +02d 24m 17.6s) | C | 120 | 17.7 | 15656 | 2025-03-08 00:17:49 | MASTER-Kislovodsk | (17h 40m 27.31s , +00d 23m 17.3s) | C | 120 | 17.9 | 15796 | 2025-03-08 00:20:09 | MASTER-Kislovodsk | (17h 40m 31.50s , +00d 23m 28.7s) | C | 120 | 17.9 | 16015 | 2025-03-08 00:24:18 | MASTER-Kislovodsk | (17h 40m 31.73s , +02d 23m 54.6s) | C | 60 | 17.1 | 16095 | 2025-03-08 00:25:39 | MASTER-Kislovodsk | (17h 46m 12.95s , +01d 24m 43.6s) | C | 60 | 17.4 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.