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GCN Circular 38503

Subject
Fermi GRB 241209D: Global MASTER-Net observations report
Date
2024-12-09T21:46:04Z (a month 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 241209D ( Fermi GBM team, GCN 38488Loading...
 
 ) errorbox  33914 sec after notice time and 33953 sec after trigger time at 2024-12-09 20:25:37 UT, with upper limit up to  19.2 mag. The observations began at zenith distance = 75 deg. The sun  altitude  is -41.5 deg. 

The galactic latitude b = 60 deg., longitude l = 302 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2701308

We obtain a following upper limits.  

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

   34044 | 2024-12-09 20:25:37 |        MASTER-Tunka | (12h 40m 42.72s , -02d 49m 30.7s) |   C |   180 | 15.0 |        
   34224 | 2024-12-09 20:25:37 |        MASTER-Tunka | (12h 40m 42.76s , -02d 49m 32.4s) |   C |   540 | 19.2 |  Coadd 
   35267 | 2024-12-09 20:46:01 |        MASTER-Tunka | (12h 40m 48.04s , -02d 50m 25.9s) |   C |   180 | 18.8 |        
   36758 | 2024-12-09 21:10:52 |        MASTER-Tunka | (12h 40m 47.42s , -02d 47m 55.6s) |   C |   180 | 19.0 |        
   37967 | 2024-12-09 21:31:01 |        MASTER-Tunka | (12h 40m 42.47s , -02d 48m 50.9s) |   C |   180 | 19.3 |        
Filter C is a clear (unfiltred) band. 


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