TITLE: GCN CIRCULAR NUMBER: 44127 SUBJECT: EP260327a: Global MASTER-Net observations report DATE: 26/03/27 08:54:22 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-OAFA robotic telescope [1] located in Argentina (OAFA observatory of San Juan National University) was pointed to the EP260327a ( EP Team et al., GCN 44126) errorbox 510 sec after trigger time at 2026-03-27 06:03:11 UT, with upper limit up to 20.3 mag. The observations began at zenith distance = 74 deg. The sun altitude is -55.4 deg. The galactic latitude b = 66 deg., longitude l = 77 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=3214974 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 561 | 2026-03-27 06:03:11 | MASTER-OAFA | (14h 22m 35.11s , +42d 24m 43.5s) | C | 100 | 19.7 | 696 | 2026-03-27 06:03:11 | MASTER-OAFA | (14h 22m 35.11s , +42d 24m 43.5s) | C | 370 | 20.3 | Coadd 678 | 2026-03-27 06:04:58 | MASTER-OAFA | (14h 22m 35.03s , +42d 24m 50.5s) | C | 120 | 19.8 | 819 | 2026-03-27 06:07:04 | MASTER-OAFA | (14h 22m 34.92s , +42d 24m 58.1s) | C | 150 | 19.8 | 930 | 2026-03-27 06:09:40 | MASTER-OAFA | (14h 22m 34.83s , +42d 25m 03.4s) | C | 60 | 19.5 | 990 | 2026-03-27 06:09:40 | MASTER-OAFA | (14h 22m 34.83s , +42d 25m 03.4s) | C | 180 | 20.2 | Coadd 995 | 2026-03-27 06:10:46 | MASTER-OAFA | (14h 22m 34.77s , +42d 25m 06.2s) | C | 60 | 19.5 | 1060 | 2026-03-27 06:11:51 | MASTER-OAFA | (14h 22m 34.69s , +42d 25m 09.4s) | C | 60 | 19.5 | 1126 | 2026-03-27 06:12:57 | MASTER-OAFA | (14h 22m 34.62s , +42d 25m 12.2s) | C | 60 | 19.5 | 1186 | 2026-03-27 06:12:57 | MASTER-OAFA | (14h 22m 34.62s , +42d 25m 12.2s) | C | 180 | 20.2 | Coadd 1192 | 2026-03-27 06:14:02 | MASTER-OAFA | (14h 22m 34.55s , +42d 25m 15.1s) | C | 60 | 19.5 | 1257 | 2026-03-27 06:15:08 | MASTER-OAFA | (14h 22m 34.47s , +42d 25m 18.0s) | C | 60 | 19.5 | 1323 | 2026-03-27 06:16:14 | MASTER-OAFA | (14h 22m 34.40s , +42d 25m 21.0s) | C | 60 | 19.5 | 1383 | 2026-03-27 06:16:14 | MASTER-OAFA | (14h 22m 34.40s , +42d 25m 21.0s) | C | 180 | 20.0 | Coadd 1389 | 2026-03-27 06:17:20 | MASTER-OAFA | (14h 22m 34.35s , +42d 25m 24.2s) | C | 60 | 19.5 | 1455 | 2026-03-27 06:18:25 | MASTER-OAFA | (14h 22m 34.26s , +42d 25m 27.1s) | C | 60 | 19.5 | 1521 | 2026-03-27 06:19:31 | MASTER-OAFA | (14h 22m 34.17s , +42d 25m 30.0s) | C | 60 | 19.5 | 1581 | 2026-03-27 06:19:31 | MASTER-OAFA | (14h 22m 34.17s , +42d 25m 30.0s) | C | 180 | 20.2 | Coadd 1586 | 2026-03-27 06:20:36 | MASTER-OAFA | (14h 22m 34.09s , +42d 25m 32.9s) | C | 60 | 19.5 | 1651 | 2026-03-27 06:21:42 | MASTER-OAFA | (14h 22m 34.03s , +42d 25m 35.6s) | C | 60 | 19.4 | 1717 | 2026-03-27 06:22:47 | MASTER-OAFA | (14h 22m 33.95s , +42d 25m 38.2s) | C | 60 | 19.5 | 1777 | 2026-03-27 06:22:47 | MASTER-OAFA | (14h 22m 33.95s , +42d 25m 38.2s) | C | 180 | 20.2 | Coadd 1782 | 2026-03-27 06:23:53 | MASTER-OAFA | (14h 22m 33.88s , +42d 25m 41.1s) | C | 60 | 19.5 | 1848 | 2026-03-27 06:24:59 | MASTER-OAFA | (14h 22m 33.80s , +42d 25m 43.6s) | C | 60 | 19.5 | 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 View this GCN Circular online at https://gcn.nasa.gov/circulars/44127. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...