GCN Circular 45448

D.Buckley (SAAO),

M. Segura,  F. Podesta, R.Podesta, E. Gonzalez (Observatorio Astronomico Felix Aguilar (OAFA)

O.Gress, N.Budnev(ISU)

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 (Lomonosov MSU)

A. Gabovich, V.Yurkov (Blagoveschensk Educational StateUniversity)
A.Sosnovskij (CrAO RAS)

A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory)

L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez,
A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory)

R.Rebolo (The Instituto de Astrofisica de Canarias)


MASTER-SAAO robotic telescope  [1]  located in South Africa (South African Astronomical Observatory) was pointed to the EP260822a ( EP Team at NAOC/CAS <ep_ta@bao.ac.cn> et al., GCN 45428
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 ) errorbox  1748 sec after notice time and 1 days 28395 sec after trigger time at 2026-08-23 23:09:17 UT, with upper limit up to  19.2 mag. The observations began at zenith distance = 54 deg. The sun  altitude  is -67.7 deg. 

MASTER-OAFA robotic telescope  located in Argentina (OAFA observatory of San Juan National University) was pointed to the EP260822a errorbox  15766 sec after notice time and 1 days 42413 sec after trigger time at 2026-08-24 03:02:55 UT, with upper limit up to  16.5 mag. The observations began at zenith distance = 76 deg. The sun  altitude  is -59.9 deg. 

MASTER-Tunka robotic telescope  located in Russia (Applied Physics Institute, Irkutsk State University) was pointed to the EP260822a errorbox  55384 sec after notice time and 1 days 82031 sec after trigger time at 2026-08-24 14:03:13 UT, with upper limit up to  18.9 mag. Observations started at twilight.  The observations began at zenith distance = 80 deg. The sun  altitude  is -15.5 deg. 

The galactic latitude b = -51 deg., longitude l = 126 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=3488802

We obtain a following upper limits.  

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

  114825 | 2026-08-23 23:09:17 |         MASTER-SAAO | (00h 55m 15.84s , +10d 52m 14.5s) |   C |    60 | 19.0 |        
  126463 | 2026-08-24 02:23:15 |         MASTER-SAAO | (00h 54m 54.50s , +10d 57m 32.8s) |   C |    60 | 19.2 |        
  128844 | 2026-08-24 03:02:55 |         MASTER-OAFA | (00h 56m 29.45s , +11d 07m 24.6s) |   C |    60 | 16.5 |        
  168461 | 2026-08-24 14:03:13 |        MASTER-Tunka | (00h 55m 09.14s , +10d 51m 17.3s) |   C |    60 | 18.4 |        
  168539 | 2026-08-24 14:04:30 |        MASTER-Tunka | (00h 55m 16.07s , +10d 50m 17.1s) |   C |    60 | 18.4 |        
  168617 | 2026-08-24 14:05:48 |        MASTER-Tunka | (00h 55m 10.04s , +10d 49m 14.1s) |   C |    60 | 18.6 |        
  168694 | 2026-08-24 14:07:06 |        MASTER-Tunka | (00h 55m 14.92s , +10d 49m 15.7s) |   C |    60 | 18.5 |        
  168772 | 2026-08-24 14:08:23 |        MASTER-Tunka | (00h 55m 12.23s , +10d 50m 60.0s) |   C |    60 | 18.5 |        
  168849 | 2026-08-24 14:09:40 |        MASTER-Tunka | (00h 55m 12.23s , +10d 49m 13.1s) |   C |    60 | 18.7 |        
  168926 | 2026-08-24 14:10:58 |        MASTER-Tunka | (00h 55m 14.76s , +10d 51m 03.7s) |   C |    60 | 18.7 |        
  169004 | 2026-08-24 14:12:15 |        MASTER-Tunka | (00h 55m 09.13s , +10d 50m 02.4s) |   C |    60 | 18.7 |        
  169083 | 2026-08-24 14:13:35 |        MASTER-Tunka | (00h 55m 09.51s , +10d 51m 00.1s) |   C |    60 | 18.8 |        
  169161 | 2026-08-24 14:14:53 |        MASTER-Tunka | (00h 55m 15.19s , +10d 49m 58.1s) |   C |    60 | 18.8 |        
  169238 | 2026-08-24 14:16:10 |        MASTER-Tunka | (00h 55m 10.13s , +10d 48m 55.8s) |   C |    60 | 18.8 |        
  169315 | 2026-08-24 14:17:26 |        MASTER-Tunka | (00h 55m 15.87s , +10d 49m 04.0s) |   C |    60 | 18.9 |        
  169392 | 2026-08-24 14:18:43 |        MASTER-Tunka | (00h 55m 12.23s , +10d 50m 34.5s) |   C |    60 | 18.8 |        
  169469 | 2026-08-24 14:20:01 |        MASTER-Tunka | (00h 55m 12.26s , +10d 48m 50.4s) |   C |    60 | 18.9 |        
  169548 | 2026-08-24 14:21:20 |        MASTER-Tunka | (00h 55m 15.11s , +10d 50m 40.8s) |   C |    60 | 18.9 |        
Filter C is a clear (unfiltred) band. 


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

[1] - V.M. Lipunov, V.G. Kornilov, E.S. Gorbovskoy, N.A. Tiurina & A.S.Kuznetsov, 2023,  Astronomical Robotic Networks and Operative Multichanel Astrophysics, Lomonosov MSU PRESS, 591pp.
http : // www.pereplet.ru/lipunov/625.html