GCN Circular 40715
Subject
Fermi trigger No 771424081: Global MASTER-Net observations report
Date
2025-06-12T23:30:27Z (2 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 GRB250612.52 (trigger No 771424081,15h 27m 31.20s , -29d 52m 48.0s, R=2.4) errorbox 35391 sec after notice time and 35422 sec after trigger time at 2025-06-12 22:18:18 UT, with upper limit up to 19.0 mag. The observations began at zenith distance = 24 deg. The sun altitude is -80.1 deg.
The galactic latitude b = 21 deg., longitude l = 339 deg.
Real time updated cover map and OT discovered available here:
https://master.sai.msu.ru/site/master2/observ.php?id=2901131
We obtain a following upper limits.
Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________
35453 | 2025-06-12 22:18:18 | MASTER-SAAO | (15h 17m 45.90s , -26d 51m 07.4s) | C | 60 | 18.5 |
35453 | 2025-06-12 22:18:18 | MASTER-SAAO | (15h 15m 46.32s , -26d 35m 46.7s) | C | 60 | 18.8 |
35644 | 2025-06-12 22:21:29 | MASTER-SAAO | (15h 17m 42.75s , -26d 50m 04.0s) | C | 60 | 18.6 |
35644 | 2025-06-12 22:21:29 | MASTER-SAAO | (15h 15m 43.63s , -26d 34m 41.7s) | C | 60 | 18.9 |
35836 | 2025-06-12 22:24:42 | MASTER-SAAO | (15h 17m 49.62s , -26d 49m 56.6s) | C | 60 | 18.6 |
35836 | 2025-06-12 22:24:42 | MASTER-SAAO | (15h 15m 50.50s , -26d 34m 33.7s) | C | 60 | 18.8 |
36028 | 2025-06-12 22:27:53 | MASTER-SAAO | (15h 17m 48.24s , -26d 50m 30.1s) | C | 60 | 18.6 |
36028 | 2025-06-12 22:27:53 | MASTER-SAAO | (15h 15m 49.05s , -26d 35m 06.7s) | C | 60 | 18.8 |
36220 | 2025-06-12 22:31:06 | MASTER-SAAO | (15h 17m 45.74s , -26d 50m 25.6s) | C | 60 | 18.5 |
36220 | 2025-06-12 22:31:06 | MASTER-SAAO | (15h 15m 46.54s , -26d 35m 01.8s) | C | 60 | 18.8 |
36412 | 2025-06-12 22:34:18 | MASTER-SAAO | (15h 17m 43.26s , -26d 49m 35.9s) | C | 60 | 18.6 |
36412 | 2025-06-12 22:34:18 | MASTER-SAAO | (15h 15m 44.01s , -26d 34m 11.9s) | C | 60 | 18.9 |
36819 | 2025-06-12 22:41:05 | MASTER-SAAO | (15h 17m 27.58s , -29d 16m 42.2s) | C | 60 | 18.8 |
36819 | 2025-06-12 22:41:05 | MASTER-SAAO | (15h 15m 25.41s , -29d 01m 18.1s) | C | 60 | 19.0 |
36913 | 2025-06-12 22:42:39 | MASTER-SAAO | (15h 26m 33.96s , -29d 15m 28.8s) | C | 60 | 18.7 |
36913 | 2025-06-12 22:42:39 | MASTER-SAAO | (15h 24m 31.63s , -29d 00m 04.3s) | C | 60 | 18.9 |
37006 | 2025-06-12 22:44:12 | MASTER-SAAO | (15h 17m 32.04s , -31d 08m 59.1s) | C | 60 | 18.6 |
37006 | 2025-06-12 22:44:12 | MASTER-SAAO | (15h 15m 27.34s , -30d 53m 34.4s) | C | 60 | 18.8 |
37101 | 2025-06-12 22:45:46 | MASTER-SAAO | (15h 24m 40.84s , -30d 54m 55.8s) | C | 60 | 18.9 |
37101 | 2025-06-12 22:45:46 | MASTER-SAAO | (15h 26m 45.73s , -31d 10m 20.7s) | C | 60 | 18.6 |
37400 | 2025-06-12 22:50:46 | MASTER-SAAO | (15h 32m 46.05s , -29d 00m 20.4s) | C | 60 | 18.9 |
37400 | 2025-06-12 22:50:46 | MASTER-SAAO | (15h 34m 48.67s , -29d 15m 47.0s) | C | 60 | 18.7 |
37496 | 2025-06-12 22:52:21 | MASTER-SAAO | (15h 41m 54.86s , -29d 02m 31.9s) | C | 60 | 18.9 |
37496 | 2025-06-12 22:52:21 | MASTER-SAAO | (15h 43m 57.74s , -29d 17m 58.3s) | C | 60 | 18.6 |
37589 | 2025-06-12 22:53:55 | MASTER-SAAO | (15h 15m 24.67s , -28d 59m 08.1s) | C | 60 | 18.8 |
37589 | 2025-06-12 22:53:55 | MASTER-SAAO | (15h 17m 27.19s , -29d 14m 33.9s) | C | 60 | 18.8 |
37683 | 2025-06-12 22:55:28 | MASTER-SAAO | (15h 24m 28.23s , -29d 00m 36.4s) | C | 60 | 18.8 |
37683 | 2025-06-12 22:55:28 | MASTER-SAAO | (15h 26m 30.96s , -29d 16m 02.0s) | C | 60 | 18.6 |
37989 | 2025-06-12 23:00:35 | MASTER-SAAO | (15h 15m 27.98s , -30d 53m 53.2s) | C | 60 | 18.8 |
37989 | 2025-06-12 23:00:35 | MASTER-SAAO | (15h 17m 33.30s , -31d 09m 17.4s) | C | 60 | 18.6 |
Filter C is a clear (unfiltred) band.
The observation and reduction will continue.
The message may be cited.