TITLE:   GCN CIRCULAR
NUMBER:  38283
SUBJECT: Integral GRB241120.25: Global MASTER-Net observations report
DATE:    24/11/20 15:57:24 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>

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-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) was pointed to the Integral GRB241120.25 (trigger No 10982,12h 57m 11.63s , +52d 08m 39.1s, R=0.0513333) errorbox  33434 sec after notice time and 33455 sec after trigger time at 2024-11-20 15:11:33 UT, with upper limit up to  18.2 mag. Observations started at twilight.  The observations began at zenith distance = 73 deg. The sun  altitude  is -10.7 deg. 

The galactic latitude b = 65 deg., longitude l = 120 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2677397

We obtain a following upper limits.  

Tmid-T0  |          Site       |Filt.| Expt. | Limit| Comment
_________|_____________________|_____|_______|______|________

   33545 |      MASTER-Tavrida |   C |   180 | 17.1 |        
   33795 |      MASTER-Tavrida |   C |   180 | 17.4 |        
   34045 |      MASTER-Tavrida |   C |   180 | 17.6 |        
   34294 |      MASTER-Tavrida |   C |   180 | 17.8 |        
   34474 |      MASTER-Tavrida |   C |   540 | 18.3 |  Coadd 
   34953 |      MASTER-Tavrida |   C |   180 | 18.0 |        
   35204 |      MASTER-Tavrida |   C |   180 | 17.9 |        
   35454 |      MASTER-Tavrida |   C |   180 | 16.2 |        
   35704 |      MASTER-Tavrida |   C |   180 | 16.1 |        
Filter C is a clear (unfiltred) band. 


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