GCN Circular 41100
Subject
Fermi GRB 250716A: Global MASTER-Net observations report
Event
Date
2025-07-16T02:15:32Z (7 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 250716A ( Fermi GBM team, GCN 41099) errorbox 93 sec after notice time and 128 sec after trigger time at 2025-07-16 01:31:14 UT, with upper limit up to 20.3 mag. The observations began at zenith distance = 65 deg. The sun altitude is -51.6 deg.
The galactic latitude b = -44 deg., longitude l = 255 deg.
Real time updated cover map and OT discovered available here:
https://master.sai.msu.ru/site/master2/observ.php?id=2937727
We obtain a following upper limits.
Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________
144 | 2025-07-16 01:31:14 | MASTER-SAAO | (04h 21m 01.64s , -48d 49m 17.3s) | C | 30 | 18.7 |
144 | 2025-07-16 01:31:15 | MASTER-SAAO | (04h 23m 46.59s , -49d 04m 32.8s) | C | 30 | 18.9 |
445 | 2025-07-16 01:36:01 | MASTER-SAAO | (04h 10m 39.54s , -50d 08m 38.2s) | C | 60 | 19.1 |
445 | 2025-07-16 01:36:01 | MASTER-SAAO | (04h 13m 29.24s , -50d 23m 52.1s) | C | 60 | 19.3 |
644 | 2025-07-16 01:39:20 | MASTER-SAAO | (04h 19m 15.27s , -48d 35m 54.2s) | C | 60 | 19.1 |
704 | 2025-07-16 01:39:20 | MASTER-SAAO | (04h 19m 15.27s , -48d 35m 54.2s) | C | 180 | 20.1 | Coadd
644 | 2025-07-16 01:39:20 | MASTER-SAAO | (04h 21m 59.51s , -48d 51m 08.0s) | C | 60 | 19.5 |
704 | 2025-07-16 01:39:20 | MASTER-SAAO | (04h 21m 59.50s , -48d 51m 08.0s) | C | 180 | 20.3 | Coadd
723 | 2025-07-16 01:40:39 | MASTER-SAAO | (04h 19m 15.21s , -48d 35m 54.7s) | C | 60 | 19.2 |
723 | 2025-07-16 01:40:39 | MASTER-SAAO | (04h 21m 59.40s , -48d 51m 08.0s) | C | 60 | 19.3 |
802 | 2025-07-16 01:41:58 | MASTER-SAAO | (04h 19m 15.12s , -48d 35m 55.6s) | C | 60 | 19.2 |
802 | 2025-07-16 01:41:58 | MASTER-SAAO | (04h 21m 59.30s , -48d 51m 08.5s) | C | 60 | 19.4 |
881 | 2025-07-16 01:43:17 | MASTER-SAAO | (04h 19m 14.99s , -48d 35m 56.7s) | C | 60 | 19.2 |
881 | 2025-07-16 01:43:17 | MASTER-SAAO | (04h 21m 59.18s , -48d 51m 09.2s) | C | 60 | 19.5 |
1549 | 2025-07-16 01:54:25 | MASTER-SAAO | (04h 23m 14.98s , -50d 08m 51.1s) | C | 60 | 19.2 |
1549 | 2025-07-16 01:54:25 | MASTER-SAAO | (04h 26m 05.15s , -50d 24m 04.2s) | C | 60 | 19.3 |
1642 | 2025-07-16 01:55:58 | MASTER-SAAO | (04h 10m 40.25s , -50d 08m 03.6s) | C | 60 | 19.2 |
1642 | 2025-07-16 01:55:58 | MASTER-SAAO | (04h 13m 30.51s , -50d 23m 15.5s) | C | 60 | 19.2 |
1737 | 2025-07-16 01:57:32 | MASTER-SAAO | (04h 24m 02.44s , -48d 13m 28.0s) | C | 60 | 19.2 |
1737 | 2025-07-16 01:57:33 | MASTER-SAAO | (04h 26m 45.90s , -48d 28m 40.4s) | C | 60 | 19.3 |
1830 | 2025-07-16 01:59:05 | MASTER-SAAO | (04h 35m 57.93s , -48d 13m 47.8s) | C | 60 | 19.2 |
1830 | 2025-07-16 01:59:06 | MASTER-SAAO | (04h 38m 41.15s , -48d 29m 00.3s) | C | 60 | 19.3 |
2023 | 2025-07-16 02:02:18 | MASTER-SAAO | (04h 13m 05.25s , -48d 15m 56.4s) | C | 60 | 19.2 |
2023 | 2025-07-16 02:02:19 | MASTER-SAAO | (04h 15m 48.99s , -48d 31m 08.2s) | C | 60 | 19.5 |
2117 | 2025-07-16 02:03:53 | MASTER-SAAO | (04h 14m 31.65s , -46d 20m 24.2s) | C | 60 | 19.1 |
2117 | 2025-07-16 02:03:53 | MASTER-SAAO | (04h 17m 09.42s , -46d 35m 36.2s) | C | 60 | 19.3 |
2210 | 2025-07-16 02:05:26 | MASTER-SAAO | (04h 26m 08.46s , -46d 21m 08.9s) | C | 60 | 19.1 |
2210 | 2025-07-16 02:05:26 | MASTER-SAAO | (04h 28m 46.06s , -46d 36m 20.9s) | C | 60 | 19.4 |
2504 | 2025-07-16 02:10:19 | MASTER-SAAO | (04h 23m 06.32s , -50d 07m 32.2s) | C | 60 | 19.3 |
Filter C is a clear (unfiltred) band.
The observation and reduction will continue.
The message may be cited.