TITLE: GCN CIRCULAR NUMBER: 42802 SUBJECT: EP251122a: Global MASTER-Net observations report DATE: 25/11/22 16:09:30 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs lipunov@xray.sai.msu.ru

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-Kislovodsk robotic telescope [1] located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) was pointed to the EP251122a ( EP Team et al., GCN 42799) errorbox 3880 sec after notice time and 5537 sec after trigger time at 2025-11-22 15:26:08 UT, with upper limit up to 19.3 mag. The observations began at zenith distance = 60 deg. The sun altitude is -18.9 deg.

The galactic latitude b = -42 deg., longitude l = 157 deg.

Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=3049413

We obtain a following upper limits.

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

5627 | 2025-11-22 15:26:08 | MASTER-Kislovodsk | (02h 30m 23.79s , +14d 20m 55.2s) | C | 180 | 16.9 | 5628 | 2025-11-22 15:26:08 | MASTER-Kislovodsk | (02h 30m 33.71s , +13d 58m 00.6s) | C | 180 | 17.8 | 7537 | 2025-11-22 15:57:58 | MASTER-Kislovodsk | (02h 30m 49.90s , +14d 17m 52.7s) | C | 180 | 18.7 | 7539 | 2025-11-22 15:58:00 | MASTER-Kislovodsk | (02h 31m 02.20s , +13d 55m 05.3s) | C | 180 | 19.3 | 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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