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GCN Circular 37283

Subject
Fermi GRB 240825A: Global MASTER-Net observations report
Date
2024-08-25T20:30:46Z (2 months ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
Via
legacy email
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-Tavrida robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Russia (Lomonosov MSU, SAI Crimea astronomical station) started inspect of the Fermi GRB 240825A ( Fermi GBM team, GCN 37273Not found
 
 
) errorbox  15929 sec after notice time and 15970 sec after trigger time at 2024-08-25 20:19:11 UT, with upper limit up to  18.5 mag. The observations began at zenith distance = 46 deg. The sun  altitude  is -32.2 deg. 

The galactic latitude b = -45 deg., longitude l = 77 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2574669

We obtain a following upper limits.  

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

   16001 | 2024-08-25 20:19:11 |      MASTER-Tavrida | (22h 43m 16.81s , +04d 47m 27.0s) |   C |    60 | 17.9 |        
   16001 | 2024-08-25 20:19:11 |      MASTER-Tavrida | (22h 43m 15.65s , +04d 52m 02.2s) |   C |    60 | 18.1 |        
   16079 | 2024-08-25 20:20:29 |      MASTER-Tavrida | (22h 51m 24.13s , +04d 47m 44.8s) |   C |    60 | 18.2 |        
   16080 | 2024-08-25 20:20:29 |      MASTER-Tavrida | (22h 51m 22.93s , +04d 52m 18.7s) |   C |    60 | 18.5 |        
   16154 | 2024-08-25 20:21:44 |      MASTER-Tavrida | (22h 46m 19.62s , +06d 05m 31.5s) |   C |    60 | 17.8 |        
Filter C is a clear (unfiltred) band. 


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