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GCN Circular 36427

Fermi trigger No 737102480: Global MASTER-Net observations report
2024-05-11T18:16:56Z (7 days 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 GRB240511.28 (trigger No 737102480,03h 53m 12.00s , -48d 52m 12.0s, R=3.5) errorbox  41377 sec after notice time and 41392 sec after trigger time at 2024-05-11 18:11:07 UT, with upper limit up to  18.5 mag. The observations began at zenith distance = 75 deg. The sun  altitude  is -29.5 deg. 

The galactic latitude b = -49 deg., longitude l = 257 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

   41422 | 2024-05-11 18:11:07 |         MASTER-SAAO | (03h 48m 20.33s , -49d 59m 11.3s) |   C |    60 | 18.0 |        
   41422 | 2024-05-11 18:11:07 |         MASTER-SAAO | (03h 51m 11.23s , -50d 12m 17.7s) |   C |    60 | 18.5 |        
   41502 | 2024-05-11 18:12:26 |         MASTER-SAAO | (04h 00m 44.67s , -49d 57m 15.7s) |   C |    60 | 18.1 |        
Filter C is a clear (unfiltred) band. 

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

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