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GCN Circular 36163

Subject
Swift GRB240418.85: Global MASTER-Net observations report
Date
2024-04-18T20:37:07Z (6 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-Kislovodsk robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) was pointed to the Swift GRB240418.85 (trigger No 1222885,15h 57m 17.26s , +23d 36m 26.3s, R=0.05) errorbox  18 sec after notice time and 78 sec after trigger time at 2024-04-18 20:25:26 UT, with upper limit up to  17.8 mag. The observations began at zenith distance = 41 deg. The sun  altitude  is -34.9 deg. 

The galactic latitude b = 48 deg., longitude l = 39 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2426906

We obtain a following upper limits.  

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

      88 |   MASTER-Kislovodsk |  P| |    20 | 17.0 |        
      98 |   MASTER-Kislovodsk |  P| |    40 | 17.3 |  Coadd 
     171 |   MASTER-Kislovodsk |  P| |    10 | 16.5 |        
     202 |   MASTER-Kislovodsk |  P| |    10 | 16.5 |        
     236 |   MASTER-Kislovodsk |  P| |    20 | 17.0 |        
     275 |   MASTER-Kislovodsk |  P| |    30 | 17.3 |        
     331 |   MASTER-Kislovodsk |  P| |    40 | 17.5 |        
     395 |   MASTER-Kislovodsk |  P| |    50 | 17.5 |        
     470 |   MASTER-Kislovodsk |  P| |    60 | 17.8 |        


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