GCN Circular 43328
Subject
EP260105a: Global MASTER-Net observations report
Event
Date
2026-01-05T06:36:38Z (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 [1] located in Argentina (OAFA observatory of San Juan National University) was pointed to the EP260105a ( EP Team et al., GCN 43327) errorbox 302 sec after trigger time at 2026-01-05 05:55:32 UT, with upper limit up to 17.7 mag. The observations began at zenith distance = 76 deg. The sun altitude is -33.4 deg.
The galactic latitude b = 79 deg., longitude l = 235 deg.
Real time updated cover map and OT discovered available here:
https://master.sai.msu.ru/site/master2/observ.php?id=3096319
We obtain a following upper limits.
Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________
333 | 2026-01-05 05:55:32 | MASTER-OAFA | (12h 04m 39.81s , +22d 45m 13.6s) | C | 60 | 17.0 |
404 | 2026-01-05 05:56:38 | MASTER-OAFA | (12h 04m 39.97s , +22d 45m 19.5s) | C | 70 | 17.2 |
490 | 2026-01-05 05:57:55 | MASTER-OAFA | (12h 04m 40.18s , +22d 45m 26.3s) | C | 90 | 17.3 |
597 | 2026-01-05 05:59:31 | MASTER-OAFA | (12h 04m 40.39s , +22d 45m 34.0s) | C | 110 | 17.3 |
723 | 2026-01-05 06:01:28 | MASTER-OAFA | (12h 04m 40.60s , +22d 45m 42.6s) | C | 130 | 17.4 |
874 | 2026-01-05 06:03:44 | MASTER-OAFA | (12h 04m 40.84s , +22d 45m 52.0s) | C | 160 | 17.5 |
991 | 2026-01-05 06:06:30 | MASTER-OAFA | (12h 04m 41.03s , +22d 45m 59.4s) | C | 60 | 17.5 |
1056 | 2026-01-05 06:07:36 | MASTER-OAFA | (12h 04m 41.10s , +22d 46m 03.1s) | C | 60 | 17.5 |
1121 | 2026-01-05 06:08:41 | MASTER-OAFA | (12h 04m 41.18s , +22d 46m 07.0s) | C | 60 | 17.5 |
1188 | 2026-01-05 06:09:47 | MASTER-OAFA | (12h 04m 41.28s , +22d 46m 10.9s) | C | 60 | 17.5 |
1253 | 2026-01-05 06:10:53 | MASTER-OAFA | (12h 04m 41.36s , +22d 46m 14.7s) | C | 60 | 17.6 |
1319 | 2026-01-05 06:11:58 | MASTER-OAFA | (12h 04m 41.43s , +22d 46m 18.6s) | C | 60 | 17.7 |
1385 | 2026-01-05 06:13:05 | MASTER-OAFA | (12h 04m 41.51s , +22d 46m 22.1s) | C | 60 | 17.7 |
1451 | 2026-01-05 06:14:10 | MASTER-OAFA | (12h 04m 41.60s , +22d 46m 25.6s) | C | 60 | 17.6 |
1516 | 2026-01-05 06:15:16 | MASTER-OAFA | (12h 04m 41.63s , +22d 46m 29.0s) | C | 60 | 17.7 |
1582 | 2026-01-05 06:16:22 | MASTER-OAFA | (12h 04m 41.67s , +22d 46m 32.3s) | C | 60 | 17.7 |
1648 | 2026-01-05 06:17:27 | MASTER-OAFA | (12h 04m 41.73s , +22d 46m 35.5s) | C | 60 | 17.7 |
1714 | 2026-01-05 06:18:33 | MASTER-OAFA | (12h 04m 41.76s , +22d 46m 38.8s) | C | 60 | 17.7 |
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