GCN Circular 45626
Subject
EP Alert 260917.32: Global MASTER-Net observations report
Date
2026-09-18T11:10:09Z (2 days ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
Via
email
M. Segura, F. Podesta, R.Podesta, E. Gonzalez (Observatorio Astronomico Felix Aguilar (OAFA)
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)
D.Buckley (SAAO),
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)
MASTER-OAFA robotic telescope [1] located in Argentina (OAFA observatory of San Juan National University) was pointed to the EP Alert 260917.32 (trigger No 1789630988,03h 07m 31.73s , +25d 25m 59.5s, R=0.0528333) errorbox 3986 sec after trigger time at 2026-09-17 08:49:34 UT, with upper limit up to 20.6 mag. The observations began at zenith distance = 59 deg. The sun altitude is -22.6 deg.
The galactic latitude b = -28 deg., longitude l = 158 deg.
Real time updated cover map and OT discovered available here:
https://master.sai.msu.ru/site/master2/observ.php?id=3506480
We obtain a following upper limits.
Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________
4016 | 2026-09-17 08:49:34 | MASTER-OAFA | (03h 06m 37.81s , +25d 26m 58.0s) | C | 60 | 20.0 |
4076 | 2026-09-17 08:49:34 | MASTER-OAFA | (03h 06m 37.81s , +25d 26m 58.1s) | C | 180 | 20.4 | Coadd
4093 | 2026-09-17 08:50:50 | MASTER-OAFA | (03h 06m 31.93s , +25d 26m 11.5s) | C | 60 | 19.9 |
4172 | 2026-09-17 08:52:09 | MASTER-OAFA | (03h 06m 32.79s , +25d 27m 14.5s) | C | 60 | 20.0 |
4248 | 2026-09-17 08:53:26 | MASTER-OAFA | (03h 06m 38.51s , +25d 26m 16.7s) | C | 60 | 19.9 |
4308 | 2026-09-17 08:53:26 | MASTER-OAFA | (03h 06m 38.51s , +25d 26m 16.7s) | C | 180 | 20.5 | Coadd
4325 | 2026-09-17 08:54:43 | MASTER-OAFA | (03h 06m 31.01s , +25d 25m 18.9s) | C | 60 | 20.0 |
4402 | 2026-09-17 08:56:00 | MASTER-OAFA | (03h 06m 37.50s , +25d 25m 37.1s) | C | 60 | 20.0 |
4477 | 2026-09-17 08:57:15 | MASTER-OAFA | (03h 06m 34.91s , +25d 26m 56.2s) | C | 60 | 20.0 |
4537 | 2026-09-17 08:57:15 | MASTER-OAFA | (03h 06m 34.91s , +25d 26m 56.2s) | C | 180 | 20.5 | Coadd
4554 | 2026-09-17 08:58:31 | MASTER-OAFA | (03h 06m 34.85s , +25d 25m 33.7s) | C | 60 | 20.1 |
4631 | 2026-09-17 08:59:49 | MASTER-OAFA | (03h 06m 38.74s , +25d 27m 14.4s) | C | 60 | 20.1 |
4706 | 2026-09-17 09:01:03 | MASTER-OAFA | (03h 06m 32.25s , +25d 26m 29.2s) | C | 60 | 20.1 |
4766 | 2026-09-17 09:01:03 | MASTER-OAFA | (03h 06m 32.25s , +25d 26m 29.2s) | C | 180 | 20.5 | Coadd
4783 | 2026-09-17 09:02:21 | MASTER-OAFA | (03h 06m 30.88s , +25d 27m 31.2s) | C | 60 | 20.0 |
4862 | 2026-09-17 09:03:39 | MASTER-OAFA | (03h 06m 37.46s , +25d 26m 32.9s) | C | 60 | 20.0 |
4937 | 2026-09-17 09:04:54 | MASTER-OAFA | (03h 06m 30.78s , +25d 25m 34.5s) | C | 60 | 20.1 |
4997 | 2026-09-17 09:04:54 | MASTER-OAFA | (03h 06m 30.78s , +25d 25m 34.5s) | C | 180 | 20.6 | Coadd
5015 | 2026-09-17 09:06:12 | MASTER-OAFA | (03h 06m 37.05s , +25d 25m 55.2s) | C | 60 | 20.0 |
5093 | 2026-09-17 09:07:30 | MASTER-OAFA | (03h 06m 34.43s , +25d 27m 32.1s) | C | 60 | 20.0 |
5173 | 2026-09-17 09:08:51 | MASTER-OAFA | (03h 06m 34.37s , +25d 26m 03.6s) | C | 60 | 20.1 |
5233 | 2026-09-17 09:08:51 | MASTER-OAFA | (03h 06m 34.37s , +25d 26m 03.6s) | C | 180 | 20.5 | Coadd
5251 | 2026-09-17 09:10:09 | MASTER-OAFA | (03h 06m 37.14s , +25d 27m 29.5s) | C | 60 | 20.0 |
5532 | 2026-09-17 09:14:49 | MASTER-OAFA | (03h 06m 36.50s , +25d 26m 02.7s) | C | 60 | 20.0 |
5612 | 2026-09-17 09:16:09 | MASTER-OAFA | (03h 06m 34.09s , +25d 27m 15.7s) | C | 60 | 19.9 |
5672 | 2026-09-17 09:16:09 | MASTER-OAFA | (03h 06m 34.09s , +25d 27m 15.7s) | C | 180 | 20.4 | Coadd
5690 | 2026-09-17 09:17:28 | MASTER-OAFA | (03h 06m 34.03s , +25d 26m 03.0s) | C | 60 | 19.9 |
5767 | 2026-09-17 09:18:45 | MASTER-OAFA | (03h 06m 37.10s , +25d 27m 28.4s) | C | 60 | 19.9 |
5843 | 2026-09-17 09:20:00 | MASTER-OAFA | (03h 06m 30.15s , +25d 26m 51.4s) | C | 60 | 19.9 |
5903 | 2026-09-17 09:20:00 | MASTER-OAFA | (03h 06m 30.15s , +25d 26m 51.4s) | C | 180 | 20.2 | Coadd
6081 | 2026-09-17 09:23:58 | MASTER-OAFA | (03h 06m 35.91s , +25d 26m 04.1s) | C | 60 | 19.6 |
6155 | 2026-09-17 09:25:12 | MASTER-OAFA | (03h 06m 33.63s , +25d 27m 27.8s) | C | 60 | 19.3 |
6230 | 2026-09-17 09:26:27 | MASTER-OAFA | (03h 06m 33.56s , +25d 26m 02.3s) | C | 60 | 19.6 |
6290 | 2026-09-17 09:26:27 | MASTER-OAFA | (03h 06m 33.56s , +25d 26m 02.3s) | C | 180 | 20.2 | Coadd
6308 | 2026-09-17 09:27:45 | MASTER-OAFA | (03h 06m 36.84s , +25d 27m 47.8s) | C | 60 | 19.8 |
6383 | 2026-09-17 09:29:00 | MASTER-OAFA | (03h 06m 30.61s , +25d 27m 00.6s) | C | 60 | 19.8 |
6460 | 2026-09-17 09:30:18 | MASTER-OAFA | (03h 06m 31.02s , +25d 28m 02.2s) | C | 60 | 19.8 |
6520 | 2026-09-17 09:30:18 | MASTER-OAFA | (03h 06m 31.02s , +25d 28m 02.2s) | C | 180 | 20.3 | Coadd
6538 | 2026-09-17 09:31:35 | MASTER-OAFA | (03h 06m 35.53s , +25d 27m 03.5s) | C | 60 | 19.7 |
6616 | 2026-09-17 09:32:53 | MASTER-OAFA | (03h 06m 29.32s , +25d 26m 05.0s) | C | 60 | 19.7 |
6690 | 2026-09-17 09:34:08 | MASTER-OAFA | (03h 06m 36.78s , +25d 26m 22.4s) | C | 60 | 19.6 |
6766 | 2026-09-17 09:35:23 | MASTER-OAFA | (03h 06m 33.14s , +25d 28m 03.9s) | C | 60 | 19.4 |
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