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GCN Circular 36500

Fermi trigger No 737559855: Global MASTER-Net observations report
2024-05-16T23:30:45Z (2 months ago)
Vladimir Lipunov at Moscow State U/Krylov Obs <>
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V. Lipunov, V.Kornilov, E. Gorbovskoy, K. Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.Senik,  D. Vlasenko,
G.Antipov, D.Zimnukhov, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D. Cheryasov, Ya.Kechin, Yu.Tselik, A. Sosnovskij
(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. Gress, N.M. Budnev, O.Ershova
(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),

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

MASTER-SAAO robotic telescope  (Global MASTER-Net:, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in South Africa (South African Astronomical Observatory) started inspect of the Fermi GRB240516.57 (trigger No 737559855,21h 37m 57.60s , -62d 26m 24.0s, R=2.31) errorbox  34181 sec after notice time and 34214 sec after trigger time at 2024-05-16 23:14:25 UT, with upper limit up to  19.2 mag. The observations began at zenith distance = 57 deg. The sun  altitude  is -74.5 deg. 

The galactic latitude b = -43 deg., longitude l = 331 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

   34245 | 2024-05-16 23:14:25 |         MASTER-SAAO | (21h 32m 19.55s , -61d 34m 58.6s) |   C |    60 | 18.6 |        
   34245 | 2024-05-16 23:14:25 |         MASTER-SAAO | (21h 36m 10.94s , -61d 47m 45.7s) |   C |    60 | 19.2 |        
Filter C is a clear (unfiltred) band. 

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

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