GCN Circular 46165

Subject
EP261105a: Global MASTER-Net observations report
Event
EP261105a
Date
2026-11-05T23:09:25Z (a day 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 (Lomonosov MSU)

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 EP261105a ( EP Team at NAOC/CAS <ep_ta@bao.ac.cn> et al., GCN 46155Loading...
 
 ) errorbox  38697 sec after notice time and 46304 sec after trigger time at 2026-11-05 22:59:38 UT, with upper limit up to  19.5 mag. The observations began at zenith distance = 36 deg. The sun  altitude  is -40.8 deg. 

The galactic latitude b = -28 deg., longitude l = 262 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=3532321

We obtain a following upper limits.  

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

   46335 | 2026-11-05 22:59:38 |         MASTER-SAAO | (06h 02m 58.52s , -54d 29m 16.9s) |   C |    60 | 18.6 |        
   46395 | 2026-11-05 22:59:38 |         MASTER-SAAO | (06h 02m 58.52s , -54d 29m 16.9s) |   C |   180 | 19.5 |  Coadd 
   46335 | 2026-11-05 22:59:39 |         MASTER-SAAO | (05h 59m 51.92s , -54d 13m 30.1s) |   C |    60 | 18.3 |        
   46395 | 2026-11-05 22:59:39 |         MASTER-SAAO | (05h 59m 51.93s , -54d 13m 30.0s) |   C |   180 | 19.4 |  Coadd 
   46427 | 2026-11-05 23:01:11 |         MASTER-SAAO | (06h 03m 01.41s , -54d 27m 57.4s) |   C |    60 | 18.8 |        
   46427 | 2026-11-05 23:01:11 |         MASTER-SAAO | (05h 59m 54.89s , -54d 12m 11.8s) |   C |    60 | 18.5 |        
   46524 | 2026-11-05 23:02:48 |         MASTER-SAAO | (06h 02m 56.04s , -54d 28m 48.6s) |   C |    60 | 18.8 |        
   46524 | 2026-11-05 23:02:48 |         MASTER-SAAO | (05h 59m 49.31s , -54d 13m 03.7s) |   C |    60 | 18.6 |        
   46617 | 2026-11-05 23:04:20 |         MASTER-SAAO | (06h 02m 54.37s , -54d 27m 49.7s) |   C |    60 | 18.9 |        
   46617 | 2026-11-05 23:04:20 |         MASTER-SAAO | (05h 59m 47.59s , -54d 12m 05.2s) |   C |    60 | 18.6 |        
   46709 | 2026-11-05 23:05:53 |         MASTER-SAAO | (06h 03m 01.54s , -54d 28m 50.1s) |   C |    60 | 19.0 |        
   46710 | 2026-11-05 23:05:53 |         MASTER-SAAO | (05h 59m 54.54s , -54d 13m 05.7s) |   C |    60 | 18.8 |        
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