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GCN Circular 36392

Subject
Fermi GRB 240504A: Global MASTER-Net observations report
Date
2024-05-04T17:32:36Z (15 days ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
Via
legacy email
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: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in South Africa (South African Astronomical Observatory) started inspect of the Fermi GRB 240504A ( Fermi GBM team, GCN 36387Not found
 
 
) errorbox  42875 sec after notice time and 42910 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 = -35 deg., longitude l = 200 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2442874

We obtain a following upper limits.  

Tmid-T0  |      Date Time      |          Site       |             Coord (J2000)          |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________

   42940 | 2024-05-04 17:08:02 |         MASTER-SAAO | (04h 16m 43.98s , -08d 23m 19.2s) |   C |    60 | 17.3 |        
   43659 | 2024-05-04 17:20:01 |         MASTER-SAAO | (04h 24m 57.17s , -08d 24m 29.7s) |   C |    60 | 17.4 |        
   43979 | 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.