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GCN Circular 41880

Subject
EP250919a: Global MASTER-Net observations report
Date
2025-09-19T04:54:19Z (5 days ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
Via
email
V.Lipunov, E.Gorbovskoy, A.Kuznetsov, K.Zhirkov, I.Panchenko, N.Tiurina, P.Balanutsa, V.Topolev, D.Vlasenko, 
G.Antipov,  A.Sankovich, Yu.Tselik, Ya.Kechin, V.Senik, A.Chasovnikov, K.Labsina, I. Gorbunov (Lomonosov MSU),
O.Gress, N.Budnev (ISU),
C.Francile,  F. Podesta, R.Podesta, E. Gonzalez  (Observatorio Astronomico Felix Aguilar (OAFA),
A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory),
A.Sosnovskij (CrAO),
A. Gabovich, V.Yurkov (Blagoveschensk Educational StateUniversity),
D.Buckley (SAAO),
R.Rebolo (The Instituto de Astrofisica de Canarias),
L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez,
A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory) 

MASTER-OAFA robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Argentina (OAFA observatory of San Juan National University) was pointed to the EP250919a ( EP Team et al., GCN 41879) errorbox 1286 sec after trigger time at 2025-09-19 02:36:21 UT, with upper limit up to  20.4 mag. The observations began at zenith distance = 28 deg. The sun  altitude  is -50.4 deg. 

MASTER-SAAO robotic telescope  located in South Africa (South African Astronomical Observatory) was pointed to the EP250919a errorbox 2640 sec after trigger time at 2025-09-19 02:58:55 UT, with upper limit up to  17.7 mag. The observations began at zenith distance = 85 deg. The sun  altitude  is -20.6 deg. 

The galactic latitude b = -31 deg., longitude l = 350 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2994829

We obtain a following upper limits.  

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

    1317 | 2025-09-19 02:36:21 |         MASTER-OAFA | (20h 01m 51.73s , -50d 10m 08.0s) |   C |    60 | 20.4 |        
    1393 | 2025-09-19 02:37:38 |         MASTER-OAFA | (20h 01m 45.42s , -50d 11m 06.5s) |   C |    60 | 20.4 |        
    1468 | 2025-09-19 02:38:53 |         MASTER-OAFA | (20h 01m 51.69s , -50d 11m 05.3s) |   C |    60 | 20.4 |        
    1771 | 2025-09-19 02:43:56 |         MASTER-OAFA | (20h 02m 12.87s , -48d 15m 58.0s) |   C |    60 | 20.3 |        
    1848 | 2025-09-19 02:45:13 |         MASTER-OAFA | (20h 02m 12.38s , -48d 14m 56.9s) |   C |    60 | 20.3 |        
    1923 | 2025-09-19 02:46:28 |         MASTER-OAFA | (20h 02m 18.99s , -48d 15m 56.3s) |   C |    60 | 20.3 |        
    2652 | 2025-09-19 02:58:37 |         MASTER-OAFA | (19h 53m 50.03s , -48d 54m 47.0s) |   C |    60 | 20.1 |        
    2671 | 2025-09-19 02:58:55 |         MASTER-SAAO | (19h 53m 22.97s , -48d 53m 39.0s) |   C |    60 | 17.3 |        
    2731 | 2025-09-19 02:58:55 |         MASTER-SAAO | (19h 53m 23.03s , -48d 53m 39.6s) |   C |   180 | 17.7 |  Coadd 
    2718 | 2025-09-19 02:59:42 |         MASTER-OAFA | (19h 53m 50.12s , -48d 54m 46.3s) |   C |    60 | 20.2 |        
    2750 | 2025-09-19 03:00:14 |         MASTER-SAAO | (19h 53m 22.90s , -48d 53m 35.3s) |   C |    60 | 17.2 |        
    2783 | 2025-09-19 03:00:48 |         MASTER-OAFA | (19h 53m 50.30s , -48d 54m 45.8s) |   C |    60 | 20.2 |        
    2829 | 2025-09-19 03:01:33 |         MASTER-SAAO | (19h 53m 22.92s , -48d 53m 29.8s) |   C |    60 | 16.4 |        
    2849 | 2025-09-19 03:01:54 |         MASTER-OAFA | (19h 53m 50.44s , -48d 54m 45.2s) |   C |    60 | 20.2 |        
    2908 | 2025-09-19 03:02:52 |         MASTER-SAAO | (19h 53m 22.65s , -48d 53m 20.6s) |   C |    60 | 17.0 |        
    2915 | 2025-09-19 03:02:59 |         MASTER-OAFA | (19h 53m 50.57s , -48d 54m 44.6s) |   C |    60 | 20.3 |        
    2980 | 2025-09-19 03:04:05 |         MASTER-OAFA | (19h 53m 50.70s , -48d 54m 43.9s) |   C |    60 | 20.3 |        
    3047 | 2025-09-19 03:05:11 |         MASTER-OAFA | (19h 53m 50.85s , -48d 54m 43.5s) |   C |    60 | 20.3 |        
    3112 | 2025-09-19 03:06:17 |         MASTER-OAFA | (19h 53m 51.00s , -48d 54m 43.3s) |   C |    60 | 20.2 |        
    3178 | 2025-09-19 03:07:22 |         MASTER-OAFA | (19h 53m 51.10s , -48d 54m 42.9s) |   C |    60 | 20.2 |        
    3244 | 2025-09-19 03:08:29 |         MASTER-OAFA | (19h 53m 51.26s , -48d 54m 42.6s) |   C |    60 | 20.2 |        
    3310 | 2025-09-19 03:09:34 |         MASTER-OAFA | (19h 53m 51.38s , -48d 54m 42.1s) |   C |    60 | 20.3 |        
    3375 | 2025-09-19 03:10:39 |         MASTER-OAFA | (19h 53m 51.55s , -48d 54m 41.6s) |   C |    60 | 20.2 |        
Filter C is a clear (unfiltred) band. 


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

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