GCN Circular 37649

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 EP240930a ( EP Team et al., GCN 37648
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 ) errorbox 124 sec after trigger time at 2024-09-30 17:19:54 UT, with upper limit up to  17.3 mag. Observations started at twilight.  The observations began at zenith distance = 79 deg. The sun  altitude  is -9.2 deg. 

MASTER-Kislovodsk robotic telescope  located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) was pointed to the EP240930a errorbox 18062 sec after trigger time at 2024-09-30 22:18:52 UT, with upper limit up to  17.9 mag. The observations began at zenith distance = 49 deg. The sun  altitude  is -46.5 deg. 

MASTER-OAFA robotic telescope  located in Argentina (OAFA observatory of San Juan National University) was pointed to the EP240930a errorbox 22682 sec after trigger time at 2024-09-30 23:35:52 UT, with upper limit up to  18.5 mag. Observations started at twilight.  The observations began at zenith distance = 76 deg. The sun  altitude  is -13.5 deg. 

The galactic latitude b = -6 deg., longitude l = 86 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2621049

We obtain a following upper limits.  

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

     134 | 2024-09-30 17:19:54 |         MASTER-SAAO | (21h 28m 34.64s , +41d 45m 10.7s) |   C |    20 | 14.2 |        
     450 | 2024-09-30 17:24:49 |         MASTER-SAAO | (21h 24m 51.90s , +40d 43m 27.1s) |   C |    60 | 15.6 |        
    1353 | 2024-09-30 17:39:52 |         MASTER-SAAO | (21h 24m 48.78s , +40d 44m 02.1s) |   C |    60 | 15.9 |        
    2319 | 2024-09-30 17:55:58 |         MASTER-SAAO | (21h 24m 53.52s , +40d 43m 57.4s) |   C |    60 | 17.0 |        
    3037 | 2024-09-30 18:07:56 |         MASTER-SAAO | (21h 15m 20.45s , +40d 45m 07.5s) |   C |    60 | 16.8 |        
    3528 | 2024-09-30 18:16:08 |         MASTER-SAAO | (21h 12m 49.64s , +42d 39m 27.0s) |   C |    60 | 16.3 |        
    4004 | 2024-09-30 18:24:03 |         MASTER-SAAO | (21h 15m 39.66s , +40d 44m 59.0s) |   C |    60 | 17.3 |        
    4498 | 2024-09-30 18:32:18 |         MASTER-SAAO | (21h 13m 09.04s , +42d 40m 26.5s) |   C |    60 | 16.4 |        
    5013 | 2024-09-30 18:40:53 |         MASTER-SAAO | (21h 15m 54.04s , +40d 46m 28.6s) |   C |    60 | 15.0 |        
    8747 | 2024-09-30 19:43:07 |         MASTER-SAAO | (21h 13m 45.17s , +42d 42m 31.1s) |   C |    60 | 13.1 |        
   18092 | 2024-09-30 22:18:52 |   MASTER-Kislovodsk | (21h 14m 58.41s , +41d 06m 20.4s) |   C |    60 | 17.9 |        
   19062 | 2024-09-30 22:35:01 |   MASTER-Kislovodsk | (21h 14m 52.88s , +41d 05m 43.9s) |   C |    60 | 17.3 |        
   20018 | 2024-09-30 22:50:57 |   MASTER-Kislovodsk | (21h 14m 49.62s , +41d 05m 27.4s) |   C |    60 | 17.8 |        
   22713 | 2024-09-30 23:35:52 |         MASTER-OAFA | (21h 23m 32.56s , +41d 29m 56.2s) |   C |    60 | 17.2 |        
   22713 | 2024-09-30 23:35:52 |         MASTER-OAFA | (21h 11m 35.12s , +41d 04m 48.7s) |   C |    60 | 18.1 |        
   23647 | 2024-09-30 23:51:26 |         MASTER-OAFA | (21h 23m 26.87s , +41d 30m 50.2s) |   C |    60 | 17.6 |        
   23647 | 2024-09-30 23:51:27 |         MASTER-OAFA | (21h 11m 29.45s , +41d 05m 42.8s) |   C |    60 | 18.4 |        
   25312 | 2024-10-01 00:19:11 |         MASTER-OAFA | (21h 23m 27.65s , +41d 32m 01.7s) |   C |    60 | 17.6 |        
   25312 | 2024-10-01 00:19:12 |         MASTER-OAFA | (21h 11m 30.93s , +41d 06m 53.3s) |   C |    60 | 18.5 |        
Filter C is a clear (unfiltred) band. 


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