GCN Circular 39942

V.Lipunov, E.Gorbovskoy, N.Tiurina,  P.Balanutsa, , D.Vlasenko, I.Panchenko,
A.Kuznetsov,  G.Antipov,  A.Sankovich, A.Sosnovskij, Yu.Tselik, M.Gulyaev, 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. 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-OAFA robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Argentina (OAFA observatory of San Juan National University) was pointed to the IceCube Alert 250330.35 (trigger No 49427574,20h 29m 18.48s , +10d 58m 33.6s, R=0.51) errorbox  91 sec after notice time and 148 sec after trigger time at 2025-03-30 08:33:34 UT, with upper limit up to  19.2 mag. The observations began at zenith distance = 69 deg. The sun  altitude  is -28.6 deg. 

The galactic latitude b = -16 deg., longitude l = 55 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2828042

We obtain a following upper limits.  

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

     154 | 2025-03-30 08:33:34 |         MASTER-OAFA | (20h 20m 09.80s , +10d 22m 06.8s) |   C |    10 | 16.4 |        
     179 | 2025-03-30 08:33:34 |         MASTER-OAFA | (20h 20m 09.79s , +10d 22m 06.9s) |   C |    60 | 17.3 |  Coadd 
     164 | 2025-03-30 08:33:35 |         MASTER-OAFA | (20h 29m 20.45s , +10d 45m 17.7s) |   C |    30 | 17.7 |        
     209 | 2025-03-30 08:33:35 |         MASTER-OAFA | (20h 29m 20.45s , +10d 45m 17.7s) |   C |   120 | 18.4 |  Coadd 
     454 | 2025-03-30 08:33:35 |         MASTER-OAFA | (20h 29m 20.44s , +10d 45m 17.7s) |   C |   610 | 18.3 |  Coadd 
     194 | 2025-03-30 08:34:10 |         MASTER-OAFA | (20h 20m 10.00s , +10d 22m 13.8s) |   C |    20 | 16.8 |        
     205 | 2025-03-30 08:34:11 |         MASTER-OAFA | (20h 29m 20.56s , +10d 45m 22.0s) |   C |    40 | 17.9 |        
     246 | 2025-03-30 08:34:57 |         MASTER-OAFA | (20h 20m 10.18s , +10d 22m 21.5s) |   C |    30 | 16.9 |        
     256 | 2025-03-30 08:34:57 |         MASTER-OAFA | (20h 29m 20.73s , +10d 45m 26.7s) |   C |    50 | 17.9 |        
     307 | 2025-03-30 08:35:53 |         MASTER-OAFA | (20h 20m 10.41s , +10d 22m 29.9s) |   C |    40 | 17.0 |        
     367 | 2025-03-30 08:35:53 |         MASTER-OAFA | (20h 20m 10.41s , +10d 22m 29.9s) |   C |   160 | 17.5 |  Coadd 
     318 | 2025-03-30 08:35:54 |         MASTER-OAFA | (20h 29m 20.96s , +10d 45m 32.0s) |   C |    60 | 17.9 |        
     398 | 2025-03-30 08:35:54 |         MASTER-OAFA | (20h 29m 20.96s , +10d 45m 32.0s) |   C |   220 | 18.5 |  Coadd 
     378 | 2025-03-30 08:36:59 |         MASTER-OAFA | (20h 20m 10.57s , +10d 22m 37.6s) |   C |    50 | 17.1 |        
     389 | 2025-03-30 08:36:59 |         MASTER-OAFA | (20h 29m 21.10s , +10d 45m 37.1s) |   C |    70 | 18.0 |        
     464 | 2025-03-30 08:38:15 |         MASTER-OAFA | (20h 20m 10.80s , +10d 22m 47.2s) |   C |    70 | 17.0 |        
     475 | 2025-03-30 08:38:15 |         MASTER-OAFA | (20h 29m 21.27s , +10d 45m 43.8s) |   C |    90 | 17.9 |        
     571 | 2025-03-30 08:39:52 |         MASTER-OAFA | (20h 20m 11.10s , +10d 22m 57.3s) |   C |    90 | 17.3 |        
     696 | 2025-03-30 08:39:52 |         MASTER-OAFA | (20h 20m 11.09s , +10d 22m 57.2s) |   C |   340 | 17.9 |  Coadd 
     581 | 2025-03-30 08:39:52 |         MASTER-OAFA | (20h 29m 21.47s , +10d 45m 50.8s) |   C |   110 | 18.2 |        
     751 | 2025-03-30 08:39:52 |         MASTER-OAFA | (20h 29m 21.47s , +10d 45m 50.6s) |   C |   450 | 18.7 |  Coadd 
     697 | 2025-03-30 08:41:48 |         MASTER-OAFA | (20h 20m 11.33s , +10d 23m 08.5s) |   C |   110 | 17.3 |        
     707 | 2025-03-30 08:41:48 |         MASTER-OAFA | (20h 29m 21.71s , +10d 45m 59.7s) |   C |   130 | 17.9 |        
     848 | 2025-03-30 08:44:04 |         MASTER-OAFA | (20h 20m 11.45s , +10d 23m 18.4s) |   C |   140 | 17.5 |        
     858 | 2025-03-30 08:44:04 |         MASTER-OAFA | (20h 29m 21.88s , +10d 46m 08.9s) |   C |   160 | 18.2 |        
    1024 | 2025-03-30 08:46:50 |         MASTER-OAFA | (20h 20m 11.60s , +10d 23m 29.1s) |   C |   160 | 17.3 |        
    1034 | 2025-03-30 08:46:50 |         MASTER-OAFA | (20h 29m 22.17s , +10d 46m 20.1s) |   C |   180 | 18.0 |        
    1210 | 2025-03-30 08:49:56 |         MASTER-OAFA | (20h 20m 11.76s , +10d 23m 40.7s) |   C |   160 | 17.6 |        
    1370 | 2025-03-30 08:49:56 |         MASTER-OAFA | (20h 20m 11.76s , +10d 23m 40.8s) |   C |   480 | 18.1 |  Coadd 
    1221 | 2025-03-30 08:49:56 |         MASTER-OAFA | (20h 29m 22.37s , +10d 46m 30.8s) |   C |   180 | 18.4 |        
    1408 | 2025-03-30 08:53:04 |         MASTER-OAFA | (20h 29m 22.58s , +10d 46m 41.4s) |   C |   180 | 18.4 |        
    1584 | 2025-03-30 08:56:10 |         MASTER-OAFA | (20h 20m 12.02s , +10d 24m 01.1s) |   C |   160 | 17.6 |        
    1594 | 2025-03-30 08:56:10 |         MASTER-OAFA | (20h 29m 22.74s , +10d 46m 51.5s) |   C |   180 | 18.4 |        
    1774 | 2025-03-30 08:56:10 |         MASTER-OAFA | (20h 29m 22.75s , +10d 46m 51.5s) |   C |   540 | 18.9 |  Coadd 
    1770 | 2025-03-30 08:59:15 |         MASTER-OAFA | (20h 20m 12.11s , +10d 24m 09.8s) |   C |   160 | 17.6 |        
    1780 | 2025-03-30 08:59:16 |         MASTER-OAFA | (20h 29m 22.89s , +10d 47m 00.1s) |   C |   180 | 18.4 |        
    1956 | 2025-03-30 09:02:22 |         MASTER-OAFA | (20h 20m 12.11s , +10d 24m 17.4s) |   C |   160 | 17.6 |        
    2116 | 2025-03-30 09:02:22 |         MASTER-OAFA | (20h 20m 12.11s , +10d 24m 17.3s) |   C |   480 | 18.2 |  Coadd 
    1966 | 2025-03-30 09:02:22 |         MASTER-OAFA | (20h 29m 23.02s , +10d 47m 08.9s) |   C |   180 | 18.6 |        
    2142 | 2025-03-30 09:05:28 |         MASTER-OAFA | (20h 20m 12.15s , +10d 24m 26.4s) |   C |   160 | 17.8 |        
    2152 | 2025-03-30 09:05:28 |         MASTER-OAFA | (20h 29m 23.11s , +10d 47m 17.6s) |   C |   180 | 18.6 |        
    2332 | 2025-03-30 09:05:28 |         MASTER-OAFA | (20h 29m 23.11s , +10d 47m 17.6s) |   C |   540 | 19.1 |  Coadd 
    2328 | 2025-03-30 09:08:34 |         MASTER-OAFA | (20h 20m 12.13s , +10d 24m 34.2s) |   C |   160 | 17.7 |        
    2338 | 2025-03-30 09:08:34 |         MASTER-OAFA | (20h 29m 23.16s , +10d 47m 25.6s) |   C |   180 | 18.7 |        
    2514 | 2025-03-30 09:11:40 |         MASTER-OAFA | (20h 20m 12.11s , +10d 24m 42.9s) |   C |   160 | 17.7 |        
    2674 | 2025-03-30 09:11:40 |         MASTER-OAFA | (20h 20m 12.11s , +10d 24m 42.9s) |   C |   480 | 18.2 |  Coadd 
    2525 | 2025-03-30 09:11:40 |         MASTER-OAFA | (20h 29m 23.23s , +10d 47m 33.9s) |   C |   180 | 18.6 |        
    2700 | 2025-03-30 09:14:46 |         MASTER-OAFA | (20h 20m 11.96s , +10d 24m 49.3s) |   C |   160 | 17.7 |        
    2710 | 2025-03-30 09:14:46 |         MASTER-OAFA | (20h 29m 23.24s , +10d 47m 41.1s) |   C |   180 | 18.6 |        
    2890 | 2025-03-30 09:14:46 |         MASTER-OAFA | (20h 29m 23.24s , +10d 47m 41.1s) |   C |   540 | 19.2 |  Coadd 
    2886 | 2025-03-30 09:17:52 |         MASTER-OAFA | (20h 20m 11.87s , +10d 24m 55.7s) |   C |   160 | 17.7 |        
    2897 | 2025-03-30 09:17:52 |         MASTER-OAFA | (20h 29m 23.23s , +10d 47m 47.9s) |   C |   180 | 18.6 |        
    3073 | 2025-03-30 09:20:58 |         MASTER-OAFA | (20h 20m 11.77s , +10d 25m 01.5s) |   C |   160 | 17.9 |        
    3233 | 2025-03-30 09:20:58 |         MASTER-OAFA | (20h 20m 11.77s , +10d 25m 01.5s) |   C |   480 | 18.3 |  Coadd 
    3083 | 2025-03-30 09:20:59 |         MASTER-OAFA | (20h 29m 23.17s , +10d 47m 54.3s) |   C |   180 | 18.8 |        
    3259 | 2025-03-30 09:24:05 |         MASTER-OAFA | (20h 20m 11.65s , +10d 25m 07.5s) |   C |   160 | 17.8 |        
    3270 | 2025-03-30 09:24:05 |         MASTER-OAFA | (20h 29m 23.08s , +10d 48m 00.1s) |   C |   180 | 18.8 |        
    3450 | 2025-03-30 09:24:05 |         MASTER-OAFA | (20h 29m 23.08s , +10d 48m 00.1s) |   C |   540 | 19.2 |  Coadd 
    3446 | 2025-03-30 09:27:11 |         MASTER-OAFA | (20h 20m 11.57s , +10d 25m 14.3s) |   C |   160 | 17.8 |        
    3456 | 2025-03-30 09:27:12 |         MASTER-OAFA | (20h 29m 22.99s , +10d 48m 06.0s) |   C |   180 | 18.8 |        
    3631 | 2025-03-30 09:30:17 |         MASTER-OAFA | (20h 20m 11.32s , +10d 25m 17.7s) |   C |   160 | 17.9 |        
    3791 | 2025-03-30 09:30:17 |         MASTER-OAFA | (20h 20m 11.32s , +10d 25m 17.7s) |   C |   480 | 18.3 |  Coadd 
    3642 | 2025-03-30 09:30:18 |         MASTER-OAFA | (20h 29m 22.85s , +10d 48m 10.9s) |   C |   180 | 18.9 |        
    3818 | 2025-03-30 09:33:23 |         MASTER-OAFA | (20h 20m 11.05s , +10d 25m 20.8s) |   C |   160 | 17.9 |        
    3828 | 2025-03-30 09:33:24 |         MASTER-OAFA | (20h 29m 22.71s , +10d 48m 15.8s) |   C |   180 | 18.8 |        
    4008 | 2025-03-30 09:33:24 |         MASTER-OAFA | (20h 29m 22.70s , +10d 48m 15.8s) |   C |   540 | 19.2 |  Coadd 
    4004 | 2025-03-30 09:36:30 |         MASTER-OAFA | (20h 20m 10.69s , +10d 25m 22.7s) |   C |   160 | 17.7 |        
    4014 | 2025-03-30 09:36:30 |         MASTER-OAFA | (20h 29m 22.52s , +10d 48m 19.4s) |   C |   180 | 18.8 |        
    4191 | 2025-03-30 09:39:37 |         MASTER-OAFA | (20h 20m 10.39s , +10d 25m 26.8s) |   C |   160 | 17.8 |        
    4351 | 2025-03-30 09:39:37 |         MASTER-OAFA | (20h 20m 10.39s , +10d 25m 26.8s) |   C |   480 | 18.2 |  Coadd 
    4201 | 2025-03-30 09:39:37 |         MASTER-OAFA | (20h 29m 22.33s , +10d 48m 23.2s) |   C |   180 | 18.7 |        
    4377 | 2025-03-30 09:42:43 |         MASTER-OAFA | (20h 20m 10.20s , +10d 25m 32.4s) |   C |   160 | 17.6 |        
    4387 | 2025-03-30 09:42:43 |         MASTER-OAFA | (20h 29m 22.13s , +10d 48m 27.3s) |   C |   180 | 18.5 |        
    4564 | 2025-03-30 09:45:49 |         MASTER-OAFA | (20h 20m 09.80s , +10d 25m 34.1s) |   C |   160 | 17.6 |        
    4574 | 2025-03-30 09:45:50 |         MASTER-OAFA | (20h 29m 21.90s , +10d 48m 30.3s) |   C |   180 | 18.5 |        
    4750 | 2025-03-30 09:48:56 |         MASTER-OAFA | (20h 20m 09.46s , +10d 25m 36.8s) |   C |   160 | 17.5 |        
    4910 | 2025-03-30 09:48:56 |         MASTER-OAFA | (20h 20m 09.48s , +10d 25m 36.8s) |   C |   480 | 17.6 |  Coadd 
    4760 | 2025-03-30 09:48:56 |         MASTER-OAFA | (20h 29m 21.60s , +10d 48m 33.2s) |   C |   180 | 17.9 |        
    4937 | 2025-03-30 09:52:02 |         MASTER-OAFA | (20h 20m 09.11s , +10d 25m 38.9s) |   C |   160 | 17.2 |        
    5122 | 2025-03-30 09:55:08 |         MASTER-OAFA | (20h 20m 08.75s , +10d 25m 41.4s) |   C |   160 | 16.9 |        
    5308 | 2025-03-30 09:58:14 |         MASTER-OAFA | (20h 20m 08.40s , +10d 25m 43.9s) |   C |   160 | 16.5 |        
Filter C is a clear (unfiltred) band. 


The observation and reduction will continue. 
The message may be cited.