GRB 250714A
GCN Circular 41088
Subject
GRB 250714A: Fermi GBM Final Real-time Localization
Date
2025-07-14T07:25:43Z (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 07:15:13 UT on 14 Jul 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250714A (trigger 774170118.010932 / 250714302).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 94.7, Dec = -21.2 (J2000 degrees, equivalent to J2000 06h 18m, -21d 11'), with a statistical uncertainty of 2.7 degrees.
The angle from the Fermi LAT boresight is 57.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250714302/quicklook/glg_skymap_all_bn250714302.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/bn250714302/quicklook/glg_healpix_all_bn250714302.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250714302/quicklook/glg_lc_medres34_bn250714302.gif
GCN Circular 41093
Subject
Fermi GRB 250714A: Global MASTER-Net observations report
Date
2025-07-15T05:31:23Z (5 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 250714A ( Fermi GBM team, GCN 41088) errorbox 76645 sec after notice time and 76677 sec after trigger time at 2025-07-15 04:33:10 UT, with upper limit up to 18.2 mag. Observations started at twilight. The observations began at zenith distance = 63 deg. The sun altitude is -13.5 deg.
The galactic latitude b = -16 deg., longitude l = 229 deg.
Real time updated cover map and OT discovered available here:
https://master.sai.msu.ru/site/master2/observ.php?id=2935479
We obtain a following upper limits.
Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________
76707 | 2025-07-15 04:33:10 | MASTER-SAAO | (06h 08m 06.67s , -21d 35m 24.6s) | C | 60 | 17.9 |
76707 | 2025-07-15 04:33:10 | MASTER-SAAO | (06h 10m 03.90s , -21d 50m 47.4s) | C | 60 | 18.1 |
76801 | 2025-07-15 04:34:43 | MASTER-SAAO | (06h 16m 39.44s , -21d 36m 00.7s) | C | 60 | 17.7 |
76801 | 2025-07-15 04:34:43 | MASTER-SAAO | (06h 18m 36.55s , -21d 51m 23.8s) | C | 60 | 18.0 |
76894 | 2025-07-15 04:36:17 | MASTER-SAAO | (06h 13m 14.34s , -23d 28m 23.7s) | C | 60 | 18.1 |
76894 | 2025-07-15 04:36:17 | MASTER-SAAO | (06h 15m 13.24s , -23d 43m 46.0s) | C | 60 | 18.2 |
76988 | 2025-07-15 04:37:50 | MASTER-SAAO | (06h 21m 58.36s , -23d 29m 38.0s) | C | 60 | 17.8 |
76988 | 2025-07-15 04:37:50 | MASTER-SAAO | (06h 23m 57.16s , -23d 45m 00.4s) | C | 60 | 18.0 |
77361 | 2025-07-15 04:44:03 | MASTER-SAAO | (06h 10m 03.46s , -21d 50m 52.0s) | C | 60 | 16.9 |
77361 | 2025-07-15 04:44:03 | MASTER-SAAO | (06h 08m 05.85s , -21d 35m 28.9s) | C | 60 | 16.5 |
77454 | 2025-07-15 04:45:37 | MASTER-SAAO | (06h 18m 34.24s , -21d 51m 29.2s) | C | 60 | 16.8 |
77548 | 2025-07-15 04:47:10 | MASTER-SAAO | (06h 15m 15.43s , -23d 45m 20.1s) | C | 60 | 16.9 |
Filter C is a clear (unfiltred) band.
The observation and reduction will continue.
The message may be cited.
GCN Circular 41101
Subject
GRB 250714A: SVOM/GRM observation
Date
2025-07-16T15:02:55Z (4 days ago)
From
tanwj@ihep.ac.cn
Via
Web form
SVOM/GRM team: Wen-Jun Tan, Chen-Wei Wang, Shi-Jie Zheng, Yue Huang, Shao-Lin Xiong, Shuang-Nan Zhang (IHEP)
SVOM/ECLAIRs team: Jean-Luc Atteia, Olivier Godet (IRAP)
Report on behalf of the SVOM team:
SVOM/GRM was triggered in-flight by a bright burst GRB 250714A (SVOM trigger reference: sb25071402) at 2025-07-14T07:15:27.00 UTC (T0), which is also detected by Fermi/GBM (Fermi GBM Team, GCN#41088).
With the event-by-event data downloaded through the X-band ground station, the GRM light curve shows that this burst consists of a main peak following behind a relatively weak emission, with a T90 of 21.6+/-10.2 s in the 15-500 keV band.
The SVOM/GRM light curve can be found here:
https://www.bursthub.cn//admin/static/svgrb250714A.png
In addition, the position of this burst, as determined by Fermi/GBM (RA= 94.7, DEC= -21.2, GCN#41088), is located at about 101 degree from the SVOM optical axis, which is well outside the ECLAIRs field of view. But the burst emission has been detected by ECLAIRs through reflection onto the Earth atmosphere, and some of the low-energy emission of GRM is also detected through atmosphere reflection.
The Space Variable Objects Monitor (SVOM) is a China-France joint mission led by the Chinese National Space Administration (CNSA, China), National Center for Space Studies (CNES, France) and the Chinese Academy of Sciences (CAS, China), which is dedicated to observing gamma-ray bursts and other transient phenomena in the energetic universe. GRM is developed by the Institute of High Energy Physics (IHEP) of CAS.
The SVOM point of contact for this burst is: Wen-Jun Tan (IHEP) (tanwj@ihep.ac.cn)