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GCN Circular 36391

Fermi trigger No 736472503: Global MASTER-Net observations report
2024-05-04T17:32:17Z (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 GRB240503.99 (trigger No 736472503,03h 53m 36.00s , +11d 25m 00.1s, R=22.3) errorbox  62750 sec after notice time and 62784 sec after trigger time at 2024-05-04 17:08:02 UT, with upper limit up to  17.4 mag. Observations started at twilight.  The observations began at zenith distance = 74 deg. The sun  altitude  is -15.3 deg. 

The galactic latitude b = -31 deg., longitude l = 178 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

   62815 | 2024-05-04 17:08:02 |         MASTER-SAAO | (04h 16m 43.98s , -08d 23m 19.2s) |   C |    60 | 17.3 |        
   63533 | 2024-05-04 17:20:01 |         MASTER-SAAO | (04h 24m 57.17s , -08d 24m 29.7s) |   C |    60 | 17.4 |        
   63853 | 2024-05-04 17:25:21 |         MASTER-SAAO | (04h 17m 03.18s , -08d 23m 43.8s) |   C |    60 | 16.9 |        
Filter C is a clear (unfiltred) band. 

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

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