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GCN Circular 38448

Subject
Fermi GRB 241206A: Global MASTER-Net observations report
Date
2024-12-06T12:45:34Z (4 months ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
Via
legacy email
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-Tunka robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Russia (Applied Physics Institute, Irkutsk State University) started inspect of the Fermi GRB 241206A ( Fermi GBM team, GCN 38447Loading...
 
 ) errorbox  138 sec after notice time and 170 sec after trigger time at 2024-12-06 12:09:40 UT, with upper limit up to  18.9 mag. The observations began at zenith distance = 73 deg. The sun  altitude  is -28.5 deg. 

The galactic latitude b = 57 deg., longitude l = 99 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2698262

We obtain a following upper limits.  

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

     186 | 2024-12-06 12:09:40 |        MASTER-Tunka | (13h 51m 49.84s , +53d 43m 36.3s) |   C |    30 | 18.1 |        
     231 | 2024-12-06 12:09:40 |        MASTER-Tunka | (13h 51m 49.88s , +53d 43m 35.4s) |   C |   120 | 18.9 |  Coadd 
     224 | 2024-12-06 12:10:13 |        MASTER-Tunka | (13h 51m 49.88s , +53d 43m 33.9s) |   C |    40 | 18.4 |        
     272 | 2024-12-06 12:10:57 |        MASTER-Tunka | (13h 51m 49.94s , +53d 43m 31.7s) |   C |    50 | 18.4 |        
     331 | 2024-12-06 12:11:50 |        MASTER-Tunka | (13h 51m 49.97s , +53d 43m 28.4s) |   C |    60 | 18.5 |        
     626 | 2024-12-06 12:16:21 |        MASTER-Tunka | (14h 21m 06.04s , +56d 07m 49.0s) |   C |   110 | 18.2 |        
     755 | 2024-12-06 12:18:14 |        MASTER-Tunka | (14h 21m 06.00s , +56d 07m 43.3s) |   C |   140 | 18.3 |        
     913 | 2024-12-06 12:20:38 |        MASTER-Tunka | (14h 21m 05.87s , +56d 07m 35.0s) |   C |   170 | 18.5 |        
    1092 | 2024-12-06 12:23:31 |        MASTER-Tunka | (14h 21m 05.93s , +56d 07m 26.5s) |   C |   180 | 18.6 |        
Filter C is a clear (unfiltred) band. 


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