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GCN Circular 41036

Subject

IceCube-250708A: Global MASTER-Net observations report

Event

IceCube-250708A

Date

2025-07-08T17:26:22Z (6 days ago)

Edited On

2025-07-10T14:16:37Z (5 days ago)

From

Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>

Edited By

Judith Racusin at NASA/GSFC <judith.racusin@nasa.gov> on behalf of Vladimir Lipunov at Lomonosov Moscow State University <lipunov@sai.msu.ru>

Via

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) was pointed to the IceCube Alert 250708.59 (trigger No 11292662,14h 52m 41.28s , +26d 45m 18.0s, R=0.51) errorbox  10955 sec after notice time and 11017 sec after trigger time at 2025-07-08 17:08:56 UT, with upper limit up to  18.8 mag. Observations started at twilight.  The observations began at zenith distance = 61 deg. The sun  altitude  is -16.8 deg. 

The galactic latitude b = 63 deg., longitude l = 39 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2929205

We obtain a following upper limits.  

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

   11047 | 2025-07-08 17:08:56 |         MASTER-SAAO | (14h 49m 32.05s , +26d 51m 11.1s) |   C |    60 | 18.1 |        
   11047 | 2025-07-08 17:08:56 |         MASTER-SAAO | (14h 51m 28.75s , +26d 35m 32.5s) |   C |    60 | 18.0 |        
   11275 | 2025-07-08 17:12:44 |         MASTER-SAAO | (14h 51m 31.65s , +26d 35m 43.8s) |   C |    60 | 17.9 |        
   11335 | 2025-07-08 17:12:44 |         MASTER-SAAO | (14h 51m 31.65s , +26d 35m 43.8s) |   C |   180 | 18.7 |  Coadd 
   11275 | 2025-07-08 17:12:44 |         MASTER-SAAO | (14h 49m 32.60s , +26d 51m 19.6s) |   C |    60 | 18.0 |        
   11335 | 2025-07-08 17:12:44 |         MASTER-SAAO | (14h 49m 32.59s , +26d 51m 19.6s) |   C |   180 | 18.8 |  Coadd 
   11369 | 2025-07-08 17:14:18 |         MASTER-SAAO | (14h 51m 34.49s , +26d 37m 22.8s) |   C |    60 | 18.0 |        
   11369 | 2025-07-08 17:14:18 |         MASTER-SAAO | (14h 49m 35.36s , +26d 52m 58.0s) |   C |    60 | 18.1 |        
   11462 | 2025-07-08 17:15:51 |         MASTER-SAAO | (14h 51m 29.28s , +26d 36m 44.1s) |   C |    60 | 18.0 |        
   11462 | 2025-07-08 17:15:51 |         MASTER-SAAO | (14h 49m 30.14s , +26d 52m 18.7s) |   C |    60 | 18.0 |        
   11584 | 2025-07-08 17:17:23 |         MASTER-SAAO | (14h 49m 30.78s , +26d 53m 23.3s) |   C |   120 | 18.4 |        
   11584 | 2025-07-08 17:17:23 |         MASTER-SAAO | (14h 51m 29.90s , +26d 37m 48.8s) |   C |   120 | 18.3 |        
   11737 | 2025-07-08 17:19:56 |         MASTER-SAAO | (14h 49m 37.53s , +26d 52m 27.5s) |   C |   120 | 18.4 |        
   11737 | 2025-07-08 17:19:56 |         MASTER-SAAO | (14h 51m 36.64s , +26d 36m 53.2s) |   C |   120 | 18.3 |        
Filter C is a clear (unfiltred) band. 


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