GCN Circular 45447
Subject
EP Alert 260820.31: Global MASTER-Net observations report
Date
2026-08-26T16:05:04Z (3 days ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
Via
email
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 EP Alert 260820.31 (trigger No 1709285030,17h 38m 19.20s , -26d 59m 49.2s, R=0.0502714) errorbox 37247 sec after trigger time at 2026-08-20 17:48:21 UT, with upper limit up to 18.2 mag. The observations began at zenith distance = 8 deg. The sun altitude is -21.2 deg.
The galactic latitude b = 2 deg., longitude l = 1 deg.
Real time updated cover map and OT discovered available here:
https://master.sai.msu.ru/site/master2/observ.php?id=3492243
We obtain a following upper limits.
Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________
37278 | 2026-08-20 17:48:21 | MASTER-SAAO | (17h 35m 55.49s , -27d 12m 58.5s) | C | 60 | 16.5 |
37372 | 2026-08-20 17:49:54 | MASTER-SAAO | (17h 36m 00.40s , -27d 12m 40.8s) | C | 60 | 16.5 |
37465 | 2026-08-20 17:51:28 | MASTER-SAAO | (17h 35m 57.43s , -27d 11m 21.3s) | C | 60 | 16.4 |
37559 | 2026-08-20 17:53:02 | MASTER-SAAO | (17h 35m 57.32s , -27d 12m 44.7s) | C | 60 | 17.4 |
37653 | 2026-08-20 17:54:35 | MASTER-SAAO | (17h 35m 59.43s , -27d 11m 12.0s) | C | 60 | 18.2 |
37748 | 2026-08-20 17:56:10 | MASTER-SAAO | (17h 35m 54.30s , -27d 11m 50.0s) | C | 60 | 18.0 |
37842 | 2026-08-20 17:57:44 | MASTER-SAAO | (17h 35m 53.56s , -27d 10m 48.2s) | C | 60 | 15.5 |
37936 | 2026-08-20 17:59:18 | MASTER-SAAO | (17h 35m 59.98s , -27d 11m 46.6s) | C | 60 | 17.4 |
38030 | 2026-08-20 18:00:53 | MASTER-SAAO | (17h 35m 54.51s , -27d 12m 44.4s) | C | 60 | 18.2 |
38124 | 2026-08-20 18:02:27 | MASTER-SAAO | (17h 35m 58.81s , -27d 12m 18.5s) | C | 60 | 17.3 |
38219 | 2026-08-20 18:04:02 | MASTER-SAAO | (17h 35m 57.00s , -27d 10m 57.2s) | C | 60 | 18.2 |
38313 | 2026-08-20 18:05:35 | MASTER-SAAO | (17h 35m 56.93s , -27d 12m 14.4s) | C | 60 | 17.9 |
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