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GCN Circular 33262

Fermi trigger No 697208885: Global MASTER-Net observations report
2023-02-04T13:30:15Z (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-Amur robotic telescope  (Global MASTER-Net:, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Russia (Blagoveshchensk State Pedagogical University) started inspect of the Fermi GRB230204.55 (trigger No 697208885,04h 49m 57.60s , +60d 59m 24.0s, R=13.25) errorbox  692 sec after notice time and 723 sec after trigger time at 2023-02-04 13:20:04 UT, with upper limit up to  16.1 mag. The observations began at zenith distance =  9 deg. The sun  altitude  is -45.5 deg. 

The galactic latitude b = 11 deg., longitude l = 148 deg.

Real time updated cover map and OT discovered available here:

We obtain a following upper limits.  

Tmid-T0  |      Date Time      |          Site       |             Coord (J2000)          |Filt.| Expt. | Limit| Comment

     754 | 2023-02-04 13:20:04 |         MASTER-Amur | (05h 52m 50.10s , +48d 42m 28.1s) |   C |    60 | 16.0 |        
     913 | 2023-02-04 13:22:44 |         MASTER-Amur | (05h 42m 27.17s , +50d 37m 28.9s) |   C |    60 | 16.1 |        
     993 | 2023-02-04 13:24:03 |         MASTER-Amur | (05h 55m 02.74s , +50d 35m 29.3s) |   C |    60 | 16.1 |        
Filter C is a clear (unfiltred) band. 

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