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GCN Circular 36623

Subject
Fermi GRB 240605A: Global MASTER-Net observations report
Date
2024-06-05T19:30:51Z (a month 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 240605A ( Fermi GBM team, GCN 36615Not found
 
 
) errorbox  51551 sec after notice time and 51586 sec after trigger time at 2024-06-05 18:26:05 UT, with upper limit up to  18.1 mag. The observations began at zenith distance = 81 deg. The sun  altitude  is -34.2 deg. 

The galactic latitude b = -26 deg., longitude l = 248 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2482928

We obtain a following upper limits.  

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

   51617 | 2024-06-05 18:26:05 |         MASTER-SAAO | (05h 35m 07.39s , -40d 38m 10.8s) |   C |    60 | 18.1 |        
   51861 | 2024-06-05 18:30:10 |         MASTER-SAAO | (05h 45m 32.01s , -38d 42m 58.8s) |   C |    60 | 18.0 |        
   51941 | 2024-06-05 18:31:30 |         MASTER-SAAO | (05h 45m 05.43s , -42d 31m 53.8s) |   C |    60 | 18.1 |        
   52021 | 2024-06-05 18:32:49 |         MASTER-SAAO | (05h 55m 55.57s , -42d 30m 39.9s) |   C |    60 | 18.1 |        
   52101 | 2024-06-05 18:34:09 |         MASTER-SAAO | (06h 04m 53.49s , -38d 44m 21.7s) |   C |    60 | 18.0 |        
   52181 | 2024-06-05 18:35:29 |         MASTER-SAAO | (06h 15m 11.71s , -38d 44m 06.3s) |   C |    60 | 17.9 |        
   52261 | 2024-06-05 18:36:49 |         MASTER-SAAO | (05h 55m 08.44s , -40d 38m 27.3s) |   C |    60 | 17.6 |        
   52341 | 2024-06-05 18:38:09 |         MASTER-SAAO | (06h 05m 41.14s , -40d 36m 37.8s) |   C |    60 | 17.4 |        
   52420 | 2024-06-05 18:39:29 |         MASTER-SAAO | (06h 05m 41.38s , -42d 30m 22.9s) |   C |    60 | 17.5 |        
   52500 | 2024-06-05 18:40:48 |         MASTER-SAAO | (06h 16m 35.52s , -42d 31m 11.1s) |   C |    60 | 14.9 |        
   52580 | 2024-06-05 18:42:08 |         MASTER-SAAO | (05h 46m 27.07s , -46d 19m 13.6s) |   C |    60 | 15.8 |        
   52659 | 2024-06-05 18:43:28 |         MASTER-SAAO | (05h 58m 00.01s , -46d 20m 06.6s) |   C |    60 | 13.8 |        
Filter C is a clear (unfiltred) band. 


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