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GCN Circular 33081

Integral GRB221218.34: Global MASTER-Net observations report
2022-12-18T14:57:14Z (a year ago)
Vladimir Lipunov at Moscow State U/Krylov Obs <>
V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko, 
G.Antipov, D.Zimnukhov, V.Senik, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov,  D.Cheryasov, Ya.Kechin
(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. Gres, N.M. Budnev
(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),

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

MASTER-Kislovodsk robotic telescope  (Global MASTER-Net:, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) was pointed to the Integral GRB221218.34 (trigger No 141204,23h 22m 36.00s , -04d 15m 38.5s, R=0.0436) errorbox  22820 sec after notice time and 22925 sec after trigger time at 2022-12-18 14:37:57 UT, with upper limit up to  18.5 mag. Observations started at twilight.  The observations began at zenith distance = 47 deg. The sun  altitude  is -10.7 deg. 

The galactic latitude b = -59 deg., longitude l = 77 deg.

Real time updated cover map and OT discovered available here:

We obtain a following upper limits.  

Tmid-T0  |          Site       |Filt.| Expt. | Limit| Comment

   23015 |   MASTER-Kislovodsk |   C |   180 | 17.8 |        
   23195 |   MASTER-Kislovodsk |   C |   540 | 18.5 |  Coadd 
   23216 |   MASTER-Kislovodsk |   C |   180 | 18.1 |        
   23417 |   MASTER-Kislovodsk |   C |   180 | 17.9 |        
   23617 |   MASTER-Kislovodsk |   C |   180 | 17.9 |        
Filter C is a clear (unfiltred) band. 

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