TITLE:   GCN CIRCULAR
NUMBER:  36933
SUBJECT: IceCube Alert 240725.22: Global MASTER-Net observations report
DATE:    24/07/25 13:13:27 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>

V. Lipunov, V.Kornilov, E. Gorbovskoy, K. Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.Senik,  D. Vlasenko,
G.Antipov, D.Zimnukhov, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D. Cheryasov, Ya.Kechin, Yu.Tselik, A. Sosnovskij
(Lomonosov Moscow State University, SAI, Physics Department),

R. Podesta, C.Lopez, F. Podesta, C.Francile
(Observatorio Astronomico Felix Aguilar OAFA),

R. Rebolo, M. Serra
(The Instituto de Astrofisica de Canarias),

D. Buckley
(South African Astronomical Observatory),

O.A. Gress, N.M. Budnev, O.Ershova
(Irkutsk State University, API),

L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez,
A.R.Corella, L.H.Rodriguez
(INAOE, Guillermo Haro Astrophysics Observatory),

A. Tlatov, D. Dormidontov
(Kislovodsk Solar Station of the Pulkovo Observatory),

V. Yurkov, A. Gabovich
(Blagoveschensk Educational State University)

MASTER-Amur robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Russia (Blagoveshchensk State Pedagogical University) was pointed to the IceCube Alert 240725.22 (trigger No 1723093,04h 03m 52.08s , +48d 49m 44.4s, R=0.64) errorbox  28094 sec after notice time and 28146 sec after trigger time at 2024-07-25 13:00:44 UT, with upper limit up to  14.9 mag. Observations started at twilight.  The observations began at zenith distance = 78 deg. The sun  altitude  is -12.3 deg. 

The galactic latitude b = -2 deg., longitude l = 153 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2540295

We obtain a following upper limits.  

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

   28236 | 2024-07-25 13:00:44 |         MASTER-Amur | (03h 59m 37.20s , +49d 22m 29.3s) |   C |   180 | 13.0 |        
   28436 | 2024-07-25 13:04:03 |         MASTER-Amur | (03h 59m 30.54s , +49d 21m 32.6s) |   C |   180 | 14.9 |        
Filter C is a clear (unfiltred) band. 


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