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GCN Circular 33841

Fermi trigger No 706317104: Global MASTER-Net observations report
2023-05-21T07:30:28Z (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-OAFA robotic telescope  (Global MASTER-Net:, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Argentina (OAFA observatory of San Juan National University) started inspect of the Fermi GRB230520.97 (trigger No 706317104,02h 06m 57.60s , -62d 06m 00.0s, R=1) errorbox  876 sec after notice time and 891 sec after trigger time at 2023-05-20 23:26:30 UT, with upper limit up to  17.4 mag. The observations began at zenith distance = 79 deg. The sun  altitude  is -21.6 deg. 

The galactic latitude b = -53 deg., longitude l = 288 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

     982 | 2023-05-20 23:26:30 |         MASTER-OAFA | (02h 05m 10.53s , -61d 58m 31.5s) |   C |   180 | 17.2 |        
    1516 | 2023-05-20 23:35:24 |         MASTER-OAFA | (02h 05m 09.55s , -61d 58m 25.6s) |   C |   180 | 17.4 |        
    1794 | 2023-05-20 23:40:03 |         MASTER-OAFA | (02h 10m 48.64s , -62d 28m 53.3s) |   C |   180 | 12.1 |        
Filter C is a clear (unfiltred) band. 

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

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