GCN Circular 45492

Subject
EP260901a: Global MASTER-Net observations report
Event
EP260901a
Date
2026-09-01T21:45:38Z (2 hours ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
Via
D.Buckley (SAAO),

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)

O.Gress, N.Budnev(ISU)

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


MASTER-SAAO robotic telescope  [1]  located in South Africa (South African Astronomical Observatory) was pointed to the EP260901a ( EP Team at NAOC/CAS <ep_ta@bao.ac.cn> et al., GCN 45487Loading...
 
 ) errorbox  23673 sec after notice time and 53037 sec after trigger time at 2026-09-01 19:51:42 UT, with upper limit up to  17.8 mag. The observations began at zenith distance = 38 deg. The sun  altitude  is -45.1 deg. 

The galactic latitude b =  9 deg., longitude l =  6 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=3497756

We obtain a following upper limits.  

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

   53068 | 2026-09-01 19:51:42 |         MASTER-SAAO | (17h 20m 52.36s , -19d 19m 12.5s) |   C |    60 | 17.4 |        
   53162 | 2026-09-01 19:53:16 |         MASTER-SAAO | (17h 20m 57.98s , -19d 20m 07.5s) |   C |    60 | 17.6 |        
   53256 | 2026-09-01 19:54:51 |         MASTER-SAAO | (17h 20m 52.19s , -19d 21m 03.2s) |   C |    60 | 17.6 |        
   53350 | 2026-09-01 19:56:24 |         MASTER-SAAO | (17h 20m 57.58s , -19d 20m 49.1s) |   C |    60 | 17.7 |        
   53454 | 2026-09-01 19:58:08 |         MASTER-SAAO | (17h 20m 54.81s , -19d 19m 14.3s) |   C |    60 | 17.7 |        
   53973 | 2026-09-01 20:06:47 |         MASTER-SAAO | (17h 20m 51.34s , -19d 19m 37.7s) |   C |    60 | 17.8 |        
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
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