GRB 250708A
GCN Circular 41028
Subject
GRB 250708A: Fermi GBM Final Real-time Localization
Date
2025-07-08T15:02:38Z (6 days ago)
From
Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>
Via
email
The Fermi GBM team reports the detection of a likely LONG GRB
At 14:52:02 UT on 8 Jul 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250708A (trigger 773679127.950166 / 250708619).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 255.1, Dec = 13.0 (J2000 degrees, equivalent to J2000 17h 00m, 13d 00'), with a statistical uncertainty of 5.0 degrees.
The angle from the Fermi LAT boresight is 83.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250708619/quicklook/glg_skymap_all_bn250708619.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/bn250708619/quicklook/glg_healpix_all_bn250708619.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250708619/quicklook/glg_lc_medres34_bn250708619.gif
GCN Circular 41037
Subject
Fermi GRB 250708A: Global MASTER-Net observations report
Date
2025-07-08T17:30:48Z (6 days ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
Via
email
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 250708A ( Fermi GBM team, GCN 41028) errorbox 8298 sec after notice time and 8329 sec after trigger time at 2025-07-08 17:10:51 UT, with upper limit up to 17.4 mag. The observations began at zenith distance = 63 deg. The sun altitude is -17.2 deg.
The galactic latitude b = 30 deg., longitude l = 33 deg.
Real time updated cover map and OT discovered available here:
https://master.sai.msu.ru/site/master2/observ.php?id=2929280
We obtain a following upper limits.
Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________
8359 | 2025-07-08 17:10:51 | MASTER-SAAO | (16h 44m 30.84s , +12d 39m 32.4s) | C | 60 | 17.2 |
8359 | 2025-07-08 17:10:51 | MASTER-SAAO | (16h 46m 19.84s , +12d 23m 56.8s) | C | 60 | 17.4 |
Filter C is a clear (unfiltred) band.
The observation and reduction will continue.
The message may be cited.