GRB250505A

This page lists all entries on GRB250505A in GRBweb

Summary Fermi GBM GCN 40348 GCN 40352

Summary table
Variable Value Source
GRB_name_Fermi GRB250505339
T0 8:08:39 UTC GCN_circulars,Fermi GBM final loc
ra 104.5800° Fermi_GBM
decl -10.3300° Fermi_GBM
pos_error 3.30e+00° Fermi_GBM
T90 13.568 s Fermi_GBM
T90_error 1.145 s Fermi_GBM
T90_start 8:08:39.284 UTC Fermi_GBM
fluence 2.91e-06 erg/cm² Fermi_GBM
fluence_error 1.89e-08 erg/cm² Fermi_GBM
T100 13.852 s
GBM_located True
mjd 60800.33934027778 GCN_circulars,Fermi GBM final loc
Fermi GBM table
GRB_name_Fermi GRB250505339
trigger_name bn250505339
ra 104.5800°
decl -10.3300°
pos_error 3.30e+00°
datum 2025-05-05
t_trigger 8:08:39.540 UTC
T90 13.568 s
T90_error 1.145 s
T90_start 8:08:39.284 UTC
fluence 2.91e-06 erg/cm²
fluence_error 1.89e-08 erg/cm²
flux_1024 4.38e+00 erg/cm²/s
flux_1024_error 2.50e-01 erg/cm²/s
flux_1024_time 3.33e+00 erg/cm²/s
flux_64 7.75e+00 erg/cm²/s
flux_64_error 1.25e+00 erg/cm²/s
GCN 40348 table
GRB_name GRB250505A
GCN_number 40348
Detection_method Fermi GBM final loc
t_trigger 8:08:39 UTC
ra 104.6000°
decl -10.3000°
Circular_text TITLE: GCN CIRCULAR NUMBER: 40348 SUBJECT: GRB 250505A: Fermi GBM Final Real-time Localization DATE: 25/05/05 08:19:09 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM The Fermi GBM team reports the detection of a likely LONG GRB At 08:08:39 UT on 5 May 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250505A (trigger 768125324.539978 / 250505339). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 104.6, Dec = -10.3 (J2000 degrees, equivalent to J2000 06h 58m, -10d 18'), with a statistical uncertainty of 3.4 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/bn250505339/quicklook/glg_skymap_all_bn250505339.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/bn250505339/quicklook/glg_healpix_all_bn250505339.fit The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250505339/quicklook/glg_lc_medres34_bn250505339.gif
GCN 40352 table
GRB_name GRB250505A
GCN_number 40352
Detection_method Fermi GBM Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 40352 SUBJECT: Fermi GRB 250505A: Global MASTER-Net observations report DATE: 25/05/05 17:15:53 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V.Lipunov, E.Gorbovskoy, A.Kuznetsov, K.Zhirkov, I.Panchenko, N.Tiurina, P.Balanutsa, V.Topolev, D.Vlasenko, G.Antipov, A.Sankovich, Yu.Tselik, 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.Sosnovskij (CrAO), 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 250505A ( Fermi GBM team, GCN 40348) errorbox 31206 sec after notice time and 31236 sec after trigger time at 2025-05-05 16:49:16 UT, with upper limit up to 18.5 mag. Observations started at twilight. The observations began at zenith distance = 37 deg. The sun altitude is -11.5 deg. The galactic latitude b = -3 deg., longitude l = 223 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2861221 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 31267 | 2025-05-05 16:49:16 | MASTER-SAAO | (06h 52m 27.70s , -10d 20m 11.1s) | C | 60 | 18.0 | 31346 | 2025-05-05 16:50:35 | MASTER-SAAO | (07h 00m 40.59s , -10d 18m 52.3s) | C | 60 | 17.9 | 31426 | 2025-05-05 16:51:55 | MASTER-SAAO | (06h 55m 08.68s , -12d 12m 30.2s) | C | 60 | 18.1 | 31506 | 2025-05-05 16:53:15 | MASTER-SAAO | (07h 03m 25.46s , -12d 13m 27.5s) | C | 60 | 18.0 | 31586 | 2025-05-05 16:54:35 | MASTER-SAAO | (06h 50m 15.46s , -08d 25m 58.2s) | C | 60 | 18.2 | 32311 | 2025-05-05 17:06:40 | MASTER-SAAO | (06h 52m 25.86s , -10d 18m 53.6s) | C | 60 | 18.5 | 32390 | 2025-05-05 17:07:59 | MASTER-SAAO | (07h 00m 29.83s , -10d 19m 51.8s) | C | 60 | 18.3 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.