TITLE: GCN CIRCULAR NUMBER: 39478 SUBJECT: EP250225a: Global MASTER-Net observations report DATE: 25/02/26 05:31:23 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs lipunov@xray.sai.msu.ru
V.Lipunov, E.Gorbovskoy, N.Tiurina, P.Balanutsa, , D.Vlasenko, I.Panchenko, A.Kuznetsov, G.Antipov, A.Sankovich, A.Sosnovskij, Yu.Tselik, M.Gulyaev, 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. 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 (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Argentina (OAFA observatory of San Juan National University) was pointed to the EP250225a ( EP Team et al., GCN 39475) errorbox 364 sec after notice time and 58846 sec after trigger time at 2025-02-26 04:34:36 UT, with upper limit up to 20.5 mag. The observations began at zenith distance = 30 deg. The sun altitude is -50.1 deg.
The galactic latitude b = 31 deg., longitude l = 238 deg.
Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2792193
We obtain a following upper limits.
Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________
58876 | 2025-02-26 04:34:36 | MASTER-OAFA | (09h 24m 15.36s , -04d 59m 40.0s) | C | 60 | 20.5 | 60307 | 2025-02-26 04:58:27 | MASTER-OAFA | (09h 24m 17.17s , -05d 00m 37.2s) | C | 60 | 20.4 | Filter C is a clear (unfiltred) band.
The observation and reduction will continue. The message may be cited.
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