GRB250617A

This page lists all entries on GRB250617A in GRBweb

Summary Fermi GBM GCN 40758 GCN 40781

Summary table
Variable Value Source
GRB_name_Fermi GRB250617673
T0 16:09:13 UTC GCN_circulars,Fermi GBM final loc
ra 354.7500° Fermi_GBM
decl 35.4100° Fermi_GBM
pos_error 3.14e+00° Fermi_GBM
T90 49.409 s Fermi_GBM
T90_error 0.722 s Fermi_GBM
T90_start 16:09:13.602 UTC Fermi_GBM
fluence 7.62e-06 erg/cm² Fermi_GBM
fluence_error 2.48e-08 erg/cm² Fermi_GBM
T100 50.011 s
GBM_located True
mjd 60843.67306712963 GCN_circulars,Fermi GBM final loc
Fermi GBM table
GRB_name_Fermi GRB250617673
trigger_name bn250617673
ra 354.7500°
decl 35.4100°
pos_error 3.14e+00°
datum 2025-06-17
t_trigger 16:09:13.346 UTC
T90 49.409 s
T90_error 0.722 s
T90_start 16:09:13.602 UTC
fluence 7.62e-06 erg/cm²
fluence_error 2.48e-08 erg/cm²
flux_1024 3.67e+00 erg/cm²/s
flux_1024_error 2.29e-01 erg/cm²/s
flux_1024_time 1.38e+01 erg/cm²/s
flux_64 5.67e+00 erg/cm²/s
flux_64_error 1.04e+00 erg/cm²/s
GCN 40758 table
GRB_name GRB250617A
GCN_number 40758
Detection_method Fermi GBM final loc
t_trigger 16:09:13 UTC
ra 354.8000°
decl 35.4000°
Circular_text TITLE: GCN CIRCULAR NUMBER: 40758 SUBJECT: GRB 250617A: Fermi GBM Final Real-time Localization DATE: 25/06/17 16:19:51 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM The Fermi GBM team reports the detection of a likely LONG GRB At 16:09:13 UT on 17 Jun 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250617A (trigger 771869358.345712 / 250617673). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 354.8, Dec = 35.4 (J2000 degrees, equivalent to J2000 23h 39m, 35d 23'), with a statistical uncertainty of 2.6 degrees. The angle from the Fermi LAT boresight is 51.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250617673/quicklook/glg_skymap_all_bn250617673.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/bn250617673/quicklook/glg_healpix_all_bn250617673.fit The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250617673/quicklook/glg_lc_medres34_bn250617673.gif
GCN 40781 table
GRB_name GRB250617A
GCN_number 40781
Detection_method Fermi GBM Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 40781 SUBJECT: Fermi GRB 250617A: Global MASTER-Net observations report DATE: 25/06/18 22:15:43 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-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 250617A ( Fermi GBM team, GCN 40758) errorbox 1 days 17814 sec after notice time and 1 days 17823 sec after trigger time at 2025-06-18 21:06:16 UT, with upper limit up to 17.7 mag. The observations began at zenith distance = 66 deg. The sun altitude is -23.6 deg. The galactic latitude b = -25 deg., longitude l = 107 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2905762 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 104253 | 2025-06-18 21:06:16 | MASTER-Kislovodsk | (23h 40m 51.75s , +35d 31m 02.8s) | C | 60 | 17.7 | 104540 | 2025-06-18 21:11:02 | MASTER-Kislovodsk | (23h 27m 52.38s , +37d 23m 28.9s) | C | 60 | 16.0 | 104624 | 2025-06-18 21:12:26 | MASTER-Kislovodsk | (23h 37m 52.75s , +37d 24m 33.4s) | C | 60 | 16.3 | 104845 | 2025-06-18 21:16:08 | MASTER-Kislovodsk | (23h 46m 54.05s , +37d 24m 18.0s) | C | 60 | 17.3 | 104928 | 2025-06-18 21:17:31 | MASTER-Kislovodsk | (23h 57m 02.84s , +37d 22m 47.1s) | C | 60 | 16.6 | 105010 | 2025-06-18 21:18:53 | MASTER-Kislovodsk | (23h 40m 51.77s , +35d 28m 47.9s) | C | 60 | 17.1 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.