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GCN Circular 36492

Subject
Swift GRB240516.15: Global MASTER-Net observations report
Date
2024-05-16T03:46:46Z (2 months 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) was pointed to the Swift GRB240516.15 (trigger No 1228797,14h 11m 04.80s , -63d 30m 18.0s, R=0.05) errorbox  18 sec after notice time and 45 sec after trigger time at 2024-05-16 03:37:13 UT, with upper limit up to  17.3 mag. The observations began at zenith distance = 65 deg. The sun  altitude  is -21.9 deg. 

The galactic latitude b = -2 deg., longitude l = 312 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2458686

We obtain a following upper limits.  

Tmid-T0  |          Site       |Filt.| Expt. | Limit| Comment
_________|_____________________|_____|_______|______|________

      50 |         MASTER-SAAO | P\\ |    10 | 16.5 |        
      50 |         MASTER-SAAO |  P/ |    10 | 16.4 |        
      68 |         MASTER-SAAO | P\\ |    10 | 16.5 |        
      68 |         MASTER-SAAO |  P/ |    10 | 16.3 |        
      93 |         MASTER-SAAO | P\\ |    20 | 16.8 |        
      93 |         MASTER-SAAO |  P/ |    20 | 16.6 |        
     122 |         MASTER-SAAO | P\\ |    20 | 16.8 |        
     122 |         MASTER-SAAO |  P/ |    20 | 16.5 |        
     154 |         MASTER-SAAO | P\\ |    30 | 17.1 |        
     154 |         MASTER-SAAO |  P/ |    30 | 16.8 |        
     192 |         MASTER-SAAO | P\\ |    30 | 16.9 |        
     192 |         MASTER-SAAO |  P/ |    30 | 16.7 |        
     236 |         MASTER-SAAO | P\\ |    40 | 17.2 |        
     236 |         MASTER-SAAO |  P/ |    40 | 16.8 |        
     289 |         MASTER-SAAO | P\\ |    50 | 17.3 |        


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