GCN Circular 42171
Subject
IceCube Alert 251008.94: Global MASTER-Net observations report
Date
2025-10-08T23:00:30Z (18 hours 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-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) was pointed to the IceCube Alert 251008.94 (trigger No 888784,02h 10m 30.00s , -37d 22m 58.8s, R=0.82) errorbox 12 sec after notice time and 77 sec after trigger time at 2025-10-08 22:37:08 UT, with upper limit up to 14.9 mag. The observations began at zenith distance = 80 deg. The sun altitude is -47.1 deg.
The galactic latitude b = -70 deg., longitude l = 248 deg.
Real time updated cover map and OT discovered available here:
https://master.sai.msu.ru/site/master2/observ.php?id=3010374
We obtain a following upper limits.
Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________
87 | 2025-10-08 22:37:08 | MASTER-Kislovodsk | (02h 10m 07.45s , -37d 12m 08.1s) | P- | 20 | 13.5 |
87 | 2025-10-08 22:37:08 | MASTER-Kislovodsk | (02h 10m 20.29s , -36d 49m 52.3s) | P| | 20 | 14.0 |
127 | 2025-10-08 22:37:48 | MASTER-Kislovodsk | (02h 10m 07.61s , -37d 12m 10.0s) | P- | 20 | 13.6 |
127 | 2025-10-08 22:37:48 | MASTER-Kislovodsk | (02h 10m 20.57s , -36d 49m 54.1s) | P| | 20 | 14.1 |
172 | 2025-10-08 22:38:27 | MASTER-Kislovodsk | (02h 10m 07.83s , -37d 12m 11.4s) | P- | 30 | 13.5 |
172 | 2025-10-08 22:38:27 | MASTER-Kislovodsk | (02h 10m 20.85s , -36d 49m 55.6s) | P| | 30 | 14.4 |
227 | 2025-10-08 22:39:17 | MASTER-Kislovodsk | (02h 10m 08.11s , -37d 12m 12.6s) | P- | 40 | 14.1 |
227 | 2025-10-08 22:39:17 | MASTER-Kislovodsk | (02h 10m 21.18s , -36d 49m 56.7s) | P| | 40 | 14.5 |
291 | 2025-10-08 22:40:17 | MASTER-Kislovodsk | (02h 10m 08.36s , -37d 12m 14.0s) | P- | 50 | 13.9 |
292 | 2025-10-08 22:40:17 | MASTER-Kislovodsk | (02h 10m 21.52s , -36d 49m 58.2s) | P| | 50 | 14.4 |
366 | 2025-10-08 22:41:27 | MASTER-Kislovodsk | (02h 10m 08.70s , -37d 12m 15.9s) | P- | 60 | 14.1 |
366 | 2025-10-08 22:41:27 | MASTER-Kislovodsk | (02h 10m 21.96s , -36d 49m 59.9s) | P| | 60 | 14.6 |
456 | 2025-10-08 22:42:47 | MASTER-Kislovodsk | (02h 10m 09.11s , -37d 12m 17.3s) | P- | 80 | 14.1 |
456 | 2025-10-08 22:42:47 | MASTER-Kislovodsk | (02h 10m 22.44s , -36d 50m 01.3s) | P| | 80 | 14.8 |
566 | 2025-10-08 22:44:27 | MASTER-Kislovodsk | (02h 10m 09.54s , -37d 12m 20.0s) | P- | 100 | 14.0 |
566 | 2025-10-08 22:44:27 | MASTER-Kislovodsk | (02h 10m 22.97s , -36d 50m 03.9s) | P| | 100 | 14.6 |
696 | 2025-10-08 22:46:26 | MASTER-Kislovodsk | (02h 10m 10.14s , -37d 12m 22.6s) | P- | 120 | 14.1 |
696 | 2025-10-08 22:46:27 | MASTER-Kislovodsk | (02h 10m 23.63s , -36d 50m 06.1s) | P| | 120 | 14.7 |
836 | 2025-10-08 22:48:46 | MASTER-Kislovodsk | (02h 10m 10.74s , -37d 12m 24.9s) | P- | 120 | 14.1 |
836 | 2025-10-08 22:48:46 | MASTER-Kislovodsk | (02h 10m 24.29s , -36d 50m 07.9s) | P| | 120 | 14.7 |
975 | 2025-10-08 22:51:06 | MASTER-Kislovodsk | (02h 10m 11.30s , -37d 12m 26.4s) | P- | 120 | 14.1 |
976 | 2025-10-08 22:51:06 | MASTER-Kislovodsk | (02h 10m 24.93s , -36d 50m 08.8s) | P| | 120 | 14.8 |
1115 | 2025-10-08 22:53:25 | MASTER-Kislovodsk | (02h 10m 11.90s , -37d 12m 27.9s) | P- | 120 | 14.1 |
1115 | 2025-10-08 22:53:26 | MASTER-Kislovodsk | (02h 10m 25.56s , -36d 50m 10.6s) | P| | 120 | 14.9 |
The observation and reduction will continue.
The message may be cited.