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GCN Circular 42358

Subject
IceCube-251018A: Global MASTER-Net observations report
Event
IceCube-251018A
Date
2025-10-18T16:39:32Z (4 days ago)
Edited On
2025-10-20T16:44:29Z (2 days ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
Edited By
Vidushi Sharma at NASA GSFC/UMBC <vidushi.sharma@nasa.gov> on behalf of Vladimir Lipunov at Lomonosov Moscow State University <lipunov@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) started inspect of the IceCube Alert 251018.21 (trigger No 22018019,21h 25m 13.92s , +39d 11m 09.6s, R=2.69) errorbox  39638 sec after notice time and 39688 sec after trigger time at 2025-10-18 16:07:11 UT, with upper limit up to  18.9 mag. The observations began at zenith distance =  8 deg. The sun  altitude  is -19.7 deg. 

The galactic latitude b = -8 deg., longitude l = 86 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=3017315

We obtain a following upper limits.  

Tmid-T0  |      Date Time      |          Site       |             Coord (J2000)          |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________

   22029 | 2025-10-18 11:12:21 |             MASTER- | (21h 25m 26.91s , +38d 32m 19.1s) |   C |    60 | 18.7 |  Coadd 
   22142 | 2025-10-18 11:14:15 |             MASTER- | (21h 34m 49.32s , +38d 32m 13.7s) |   C |    60 | 18.4 |  Coadd 
   22136 | 2025-10-18 11:14:33 |             MASTER- | (21h 24m 42.35s , +40d 38m 41.0s) |   C |    10 | 18.2 |        
   22149 | 2025-10-18 11:14:47 |             MASTER- | (21h 24m 42.32s , +40d 38m 40.6s) |   C |    10 | 18.3 |        
   22163 | 2025-10-18 11:15:00 |             MASTER- | (21h 24m 42.33s , +40d 38m 40.8s) |   C |    10 | 18.3 |        
   22176 | 2025-10-18 11:15:13 |             MASTER- | (21h 24m 42.36s , +40d 38m 40.0s) |   C |    10 | 18.3 |        
   22189 | 2025-10-18 11:15:27 |             MASTER- | (21h 24m 42.37s , +40d 38m 39.1s) |   C |    10 | 18.3 |        
   22203 | 2025-10-18 11:15:40 |             MASTER- | (21h 24m 42.39s , +40d 38m 39.0s) |   C |    10 | 18.3 |        
   22216 | 2025-10-18 11:15:54 |             MASTER- | (21h 24m 42.42s , +40d 38m 38.2s) |   C |    10 | 18.3 |        
   22230 | 2025-10-18 11:16:07 |             MASTER- | (21h 24m 42.40s , +40d 38m 37.6s) |   C |    10 | 18.2 |        
   22244 | 2025-10-18 11:16:21 |             MASTER- | (21h 24m 42.40s , +40d 38m 37.0s) |   C |    10 | 18.2 |        
   22266 | 2025-10-18 11:16:43 |             MASTER- | (21h 24m 42.40s , +40d 38m 36.1s) |   C |    10 | 18.4 |        
   22280 | 2025-10-18 11:16:58 |             MASTER- | (21h 24m 42.41s , +40d 38m 35.3s) |   C |    10 | 18.4 |        
   22294 | 2025-10-18 11:17:11 |             MASTER- | (21h 24m 42.40s , +40d 38m 34.7s) |   C |    10 | 18.4 |        
   22307 | 2025-10-18 11:17:25 |             MASTER- | (21h 24m 42.46s , +40d 38m 34.3s) |   C |    10 | 18.3 |        
   22324 | 2025-10-18 11:17:38 |             MASTER- | (21h 24m 42.44s , +40d 38m 34.3s) |   C |    15 | 18.7 |        
   22342 | 2025-10-18 11:17:57 |             MASTER- | (21h 24m 42.43s , +40d 38m 32.8s) |   C |    15 | 18.7 |        
   22361 | 2025-10-18 11:18:16 |             MASTER- | (21h 24m 42.47s , +40d 38m 32.7s) |   C |    15 | 18.7 |        
   22380 | 2025-10-18 11:18:34 |             MASTER- | (21h 24m 42.47s , +40d 38m 31.2s) |   C |    15 | 18.7 |        
   22398 | 2025-10-18 11:18:52 |             MASTER- | (21h 24m 42.73s , +40d 38m 28.8s) |   C |    15 | 17.7 |        
   22417 | 2025-10-18 11:19:11 |             MASTER- | (21h 24m 42.65s , +40d 38m 27.9s) |   C |    15 | 17.4 |        
   22987 | 2025-10-18 11:28:20 |             MASTER- | (21h 31m 15.12s , +40d 24m 56.9s) |   C |    60 | 19.3 |  Coadd 
   23065 | 2025-10-18 11:29:38 |             MASTER- | (21h 20m 28.77s , +36d 38m 22.6s) |   C |    60 | 19.3 |  Coadd 
   23238 | 2025-10-18 11:32:30 |             MASTER- | (21h 24m 47.36s , +40d 38m 33.7s) |   C |    60 | 19.4 |  Coadd 
   23395 | 2025-10-18 11:35:08 |             MASTER- | (21h 24m 39.85s , +40d 38m 56.5s) |   C |    60 | 19.6 |  Coadd 
   23440 | 2025-10-18 11:35:53 |             MASTER- | (21h 26m 55.46s , +34d 43m 11.4s) |   C |    60 | 19.6 |        
   23514 | 2025-10-18 11:37:06 |             MASTER- | (21h 24m 38.44s , +40d 36m 49.8s) |   C |    60 | 19.6 |        
   23586 | 2025-10-18 11:38:19 |             MASTER- | (21h 31m 14.78s , +40d 24m 32.2s) |   C |    60 | 19.6 |        
   23659 | 2025-10-18 11:39:32 |             MASTER- | (21h 20m 28.45s , +36d 37m 54.8s) |   C |    60 | 19.4 |        
   23810 | 2025-10-18 11:42:03 |             MASTER- | (21h 24m 45.36s , +40d 38m 28.6s) |   C |    60 | 19.6 |        
   23959 | 2025-10-18 11:44:31 |             MASTER- | (21h 24m 41.51s , +40d 38m 32.1s) |   C |    60 | 19.6 |        
   24033 | 2025-10-18 11:45:46 |             MASTER- | (21h 39m 37.95s , +36d 37m 01.8s) |   C |    60 | 19.9 |        
   24113 | 2025-10-18 11:47:06 |             MASTER- | (21h 26m 55.34s , +34d 43m 32.1s) |   C |    60 | 19.6 |        
   24186 | 2025-10-18 11:48:19 |             MASTER- | (21h 24m 38.56s , +40d 37m 23.4s) |   C |    60 | 19.6 |        
   24261 | 2025-10-18 11:49:34 |             MASTER- | (21h 31m 08.05s , +40d 25m 50.0s) |   C |    60 | 19.6 |        
   24335 | 2025-10-18 11:50:47 |             MASTER- | (21h 20m 31.98s , +36d 36m 32.3s) |   C |    60 | 19.4 |        
   24673 | 2025-10-18 11:56:25 |             MASTER- | (21h 38m 44.90s , +37d 40m 08.5s) |   C |    60 | 19.7 |        
   24746 | 2025-10-18 11:57:39 |             MASTER- | (21h 26m 06.59s , +35d 44m 31.8s) |   C |    60 | 19.6 |        
   24911 | 2025-10-18 12:00:24 |             MASTER- | (21h 30m 14.16s , +41d 26m 28.4s) |   C |    60 | 19.5 |        
   24992 | 2025-10-18 12:01:44 |             MASTER- | (21h 19m 42.75s , +37d 38m 24.3s) |   C |    60 | 19.5 |        
   25296 | 2025-10-18 12:06:48 |             MASTER- | (21h 38m 47.62s , +37d 39m 00.3s) |   C |    60 | 19.9 |        
   25372 | 2025-10-18 12:08:04 |             MASTER- | (21h 26m 09.90s , +35d 45m 43.2s) |   C |    60 | 19.7 |        
   25618 | 2025-10-18 12:12:11 |             MASTER- | (21h 30m 14.23s , +41d 26m 02.8s) |   C |    60 | 19.5 |        
   25692 | 2025-10-18 12:13:25 |             MASTER- | (21h 19m 42.14s , +37d 37m 52.9s) |   C |    60 | 19.5 |        
   25916 | 2025-10-18 12:17:08 |             MASTER- | (21h 38m 41.75s , +37d 38m 43.9s) |   C |    60 | 19.9 |        
   25989 | 2025-10-18 12:18:21 |             MASTER- | (21h 26m 04.07s , +35d 45m 22.4s) |   C |    60 | 19.6 |        
   26238 | 2025-10-18 12:22:30 |             MASTER- | (21h 30m 15.89s , +41d 26m 02.0s) |   C |    60 | 19.6 |        
   26312 | 2025-10-18 12:23:45 |             MASTER- | (21h 19m 42.33s , +37d 38m 56.0s) |   C |    60 | 19.5 |        
   26642 | 2025-10-18 12:29:15 |             MASTER- | (21h 38m 40.69s , +37d 39m 18.2s) |   C |    60 | 20.0 |        
   26716 | 2025-10-18 12:30:28 |             MASTER- | (21h 26m 03.39s , +35d 42m 50.9s) |   C |    60 | 19.6 |        
   27298 | 2025-10-18 12:40:11 |             MASTER- | (21h 38m 41.77s , +37d 38m 45.3s) |   C |    60 | 19.9 |        
   39779 | 2025-10-18 16:07:11 |   MASTER-Kislovodsk | (21h 23m 12.87s , +39d 31m 52.3s) |   C |   180 | 18.3 |        
   39959 | 2025-10-18 16:07:11 |   MASTER-Kislovodsk | (21h 23m 12.87s , +39d 31m 52.2s) |   C |   540 | 18.6 |  Coadd 
   39779 | 2025-10-18 16:07:11 |   MASTER-Kislovodsk | (21h 28m 59.97s , +39d 09m 35.7s) |   C |   180 | 18.7 |        
   39919 | 2025-10-18 16:10:31 |   MASTER-Kislovodsk | (21h 29m 03.89s , +41d 25m 46.0s) |   C |    60 | 17.5 |        
   39919 | 2025-10-18 16:10:31 |   MASTER-Kislovodsk | (21h 35m 00.82s , +41d 03m 22.0s) |   C |    60 | 18.1 |        
   40059 | 2025-10-18 16:11:51 |   MASTER-Kislovodsk | (21h 23m 12.96s , +39d 29m 49.4s) |   C |   180 | 18.2 |        
   40059 | 2025-10-18 16:11:51 |   MASTER-Kislovodsk | (21h 29m 00.21s , +39d 07m 33.0s) |   C |   180 | 18.6 |        
   40199 | 2025-10-18 16:15:11 |   MASTER-Kislovodsk | (21h 32m 40.41s , +39d 30m 38.4s) |   C |    60 | 17.3 |        
   40199 | 2025-10-18 16:15:11 |   MASTER-Kislovodsk | (21h 38m 27.62s , +39d 08m 21.8s) |   C |    60 | 17.9 |        
   40339 | 2025-10-18 16:16:31 |   MASTER-Kislovodsk | (21h 23m 15.28s , +39d 31m 25.2s) |   C |   180 | 18.2 |        
   40339 | 2025-10-18 16:16:31 |   MASTER-Kislovodsk | (21h 29m 02.86s , +39d 09m 10.0s) |   C |   180 | 18.5 |        
   40706 | 2025-10-18 16:23:38 |   MASTER-Kislovodsk | (21h 28m 41.27s , +41d 26m 54.8s) |   C |    60 | 17.8 |        
   40706 | 2025-10-18 16:23:39 |   MASTER-Kislovodsk | (21h 34m 56.99s , +41d 04m 17.1s) |   C |    60 | 18.4 |        
   40846 | 2025-10-18 16:24:59 |   MASTER-Kislovodsk | (21h 22m 51.36s , +39d 31m 08.1s) |   C |   180 | 18.3 |        
   40846 | 2025-10-18 16:24:59 |   MASTER-Kislovodsk | (21h 28m 56.82s , +39d 08m 19.4s) |   C |   180 | 18.7 |        
   40986 | 2025-10-18 16:28:18 |   MASTER-Kislovodsk | (21h 32m 12.06s , +39d 32m 51.9s) |   C |    60 | 17.7 |        
   40986 | 2025-10-18 16:28:18 |   MASTER-Kislovodsk | (21h 38m 17.80s , +39d 09m 55.3s) |   C |    60 | 18.2 |        
   41126 | 2025-10-18 16:29:38 |   MASTER-Kislovodsk | (21h 22m 59.40s , +39d 31m 04.5s) |   C |   180 | 18.6 |        
   41126 | 2025-10-18 16:29:38 |   MASTER-Kislovodsk | (21h 29m 05.14s , +39d 07m 57.1s) |   C |   180 | 18.9 |        
Filter C is a clear (unfiltred) band. 


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