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GCN Circular 36377

Subject
Fermi GRB 240502B: Global MASTER-Net observations report
Date
2024-05-03T00:47:18Z (16 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 240502B ( Fermi GBM team, GCN 36372Not found
 
 
) errorbox  36140 sec after notice time and 36171 sec after trigger time at 2024-05-03 00:26:33 UT, with upper limit up to  17.3 mag. The observations began at zenith distance = 78 deg. The sun  altitude  is -60.0 deg. 

The galactic latitude b = -8 deg., longitude l = 71 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2441238

We obtain a following upper limits.  

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

   36201 | 2024-05-03 00:26:33 |         MASTER-SAAO | (20h 14m 58.62s , +25d 36m 09.9s) |   C |    60 | 16.2 |        
   36201 | 2024-05-03 00:26:33 |         MASTER-SAAO | (20h 13m 01.23s , +25d 49m 10.7s) |   C |    60 | 16.9 |        
   36281 | 2024-05-03 00:27:53 |         MASTER-SAAO | (20h 28m 37.26s , +21d 46m 50.1s) |   C |    60 | 15.9 |        
   36281 | 2024-05-03 00:27:53 |         MASTER-SAAO | (20h 26m 43.21s , +21d 59m 50.0s) |   C |    60 | 16.5 |        
   36361 | 2024-05-03 00:29:12 |         MASTER-SAAO | (20h 12m 58.53s , +23d 41m 25.1s) |   C |    60 | 16.3 |        
   36715 | 2024-05-03 00:35:07 |         MASTER-SAAO | (20h 18m 19.41s , +27d 30m 06.6s) |   C |    60 | 16.1 |        
   36715 | 2024-05-03 00:35:07 |         MASTER-SAAO | (20h 16m 19.77s , +27d 43m 08.4s) |   C |    60 | 17.0 |        
   36795 | 2024-05-03 00:36:27 |         MASTER-SAAO | (20h 29m 29.68s , +23d 42m 51.3s) |   C |    60 | 17.0 |        
   36795 | 2024-05-03 00:36:27 |         MASTER-SAAO | (20h 27m 33.69s , +23d 55m 52.8s) |   C |    60 | 17.3 |        
Filter C is a clear (unfiltred) band. 


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