TITLE: GCN CIRCULAR NUMBER: 43870 SUBJECT: EP260227a: Global MASTER-Net observations report DATE: 26/02/28 04:45:41 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-SAAO robotic telescope [1] located in South Africa (South African Astronomical Observatory) was pointed to the EP260227a ( EP Team et al., GCN 43869) errorbox 14883 sec after trigger time at 2026-02-28 00:20:32 UT, with upper limit up to 21.0 mag. The observations began at zenith distance = 42 deg. The sun altitude is -44.5 deg. The galactic latitude b = 41 deg., longitude l = 345 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=3160292 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 14913 | 2026-02-28 00:20:32 | MASTER-SAAO | (14h 50m 11.27s , -11d 34m 27.7s) | C | 60 | 19.3 | 14973 | 2026-02-28 00:20:32 | MASTER-SAAO | (14h 50m 11.26s , -11d 34m 27.7s) | C | 180 | 19.8 | 15093 | 2026-02-28 00:20:32 | MASTER-SAAO | (14h 50m 11.26s , -11d 34m 27.7s) | C | 420 | 20.1 | 15693 | 2026-02-28 00:20:32 | MASTER-SAAO | (14h 50m 11.26s , -11d 34m 27.7s) | C | 1620 | 21.0 | 14913 | 2026-02-28 00:20:32 | MASTER-SAAO | (14h 48m 18.09s , -11d 18m 45.9s) | C | 60 | 19.2 | 14973 | 2026-02-28 00:20:32 | MASTER-SAAO | (14h 48m 18.09s , -11d 18m 45.9s) | C | 180 | 19.8 | 15093 | 2026-02-28 00:20:32 | MASTER-SAAO | (14h 48m 18.09s , -11d 18m 46.0s) | C | 420 | 20.0 | 15693 | 2026-02-28 00:20:32 | MASTER-SAAO | (14h 48m 17.70s , -11d 18m 51.8s) | C | 1620 | 20.7 | 15005 | 2026-02-28 00:22:04 | MASTER-SAAO | (14h 50m 17.85s , -11d 34m 01.7s) | C | 60 | 19.3 | 15005 | 2026-02-28 00:22:04 | MASTER-SAAO | (14h 48m 24.61s , -11d 18m 21.0s) | C | 60 | 19.2 | 15097 | 2026-02-28 00:23:36 | MASTER-SAAO | (14h 50m 14.69s , -11d 32m 38.3s) | C | 60 | 19.3 | 15097 | 2026-02-28 00:23:36 | MASTER-SAAO | (14h 48m 21.41s , -11d 16m 58.1s) | C | 60 | 19.2 | 15688 | 2026-02-28 00:32:56 | MASTER-SAAO | (14h 50m 10.29s , -11d 34m 21.4s) | C | 120 | 19.7 | 15688 | 2026-02-28 00:32:56 | MASTER-SAAO | (14h 48m 17.24s , -11d 18m 39.5s) | C | 120 | 19.6 | 15840 | 2026-02-28 00:35:28 | MASTER-SAAO | (14h 50m 16.17s , -11d 34m 15.7s) | C | 120 | 19.7 | 15840 | 2026-02-28 00:35:28 | MASTER-SAAO | (14h 48m 23.05s , -11d 18m 34.8s) | C | 120 | 19.6 | 15991 | 2026-02-28 00:38:00 | MASTER-SAAO | (14h 50m 14.08s , -11d 32m 35.0s) | C | 120 | 19.8 | 16111 | 2026-02-28 00:38:00 | MASTER-SAAO | (14h 50m 14.08s , -11d 32m 35.0s) | C | 360 | 20.2 | 15991 | 2026-02-28 00:38:00 | MASTER-SAAO | (14h 48m 20.90s , -11d 16m 54.7s) | C | 120 | 19.7 | 16111 | 2026-02-28 00:38:00 | MASTER-SAAO | (14h 48m 20.90s , -11d 16m 54.7s) | C | 360 | 20.1 | 16144 | 2026-02-28 00:40:32 | MASTER-SAAO | (14h 50m 14.08s , -11d 33m 59.3s) | C | 120 | 19.8 | 16144 | 2026-02-28 00:40:32 | MASTER-SAAO | (14h 48m 20.83s , -11d 18m 19.0s) | C | 120 | 19.6 | 16296 | 2026-02-28 00:43:04 | MASTER-SAAO | (14h 50m 18.07s , -11d 32m 38.9s) | C | 120 | 19.8 | 16296 | 2026-02-28 00:43:04 | MASTER-SAAO | (14h 48m 24.76s , -11d 16m 58.8s) | C | 120 | 19.7 | 16448 | 2026-02-28 00:45:36 | MASTER-SAAO | (14h 50m 11.21s , -11d 33m 12.8s) | C | 120 | 19.8 | 16688 | 2026-02-28 00:45:36 | MASTER-SAAO | (14h 50m 11.21s , -11d 33m 12.8s) | C | 600 | 20.2 | 16448 | 2026-02-28 00:45:36 | MASTER-SAAO | (14h 48m 17.86s , -11d 17m 32.5s) | C | 120 | 19.7 | 16688 | 2026-02-28 00:45:36 | MASTER-SAAO | (14h 48m 17.86s , -11d 17m 32.4s) | C | 600 | 20.2 | 16600 | 2026-02-28 00:48:08 | MASTER-SAAO | (14h 50m 10.14s , -11d 32m 11.3s) | C | 120 | 19.8 | 16600 | 2026-02-28 00:48:08 | MASTER-SAAO | (14h 48m 16.73s , -11d 16m 31.1s) | C | 120 | 19.7 | 16752 | 2026-02-28 00:50:41 | MASTER-SAAO | (14h 50m 17.32s , -11d 33m 09.5s) | C | 120 | 19.8 | 17112 | 2026-02-28 00:50:41 | MASTER-SAAO | (14h 50m 17.32s , -11d 33m 09.5s) | C | 840 | 20.2 | 16752 | 2026-02-28 00:50:41 | MASTER-SAAO | (14h 48m 23.83s , -11d 17m 29.0s) | C | 120 | 19.8 | 17112 | 2026-02-28 00:50:41 | MASTER-SAAO | (14h 48m 23.83s , -11d 17m 29.0s) | C | 840 | 20.2 | 16904 | 2026-02-28 00:53:13 | MASTER-SAAO | (14h 50m 11.91s , -11d 34m 07.5s) | C | 120 | 19.8 | 16904 | 2026-02-28 00:53:13 | MASTER-SAAO | (14h 48m 18.35s , -11d 18m 26.9s) | C | 120 | 19.8 | 17056 | 2026-02-28 00:55:45 | MASTER-SAAO | (14h 50m 17.31s , -11d 34m 04.1s) | C | 120 | 19.8 | 17176 | 2026-02-28 00:55:45 | MASTER-SAAO | (14h 50m 17.31s , -11d 34m 04.1s) | C | 360 | 20.2 | 17056 | 2026-02-28 00:55:45 | MASTER-SAAO | (14h 48m 23.70s , -11d 18m 23.5s) | C | 120 | 19.8 | 17176 | 2026-02-28 00:55:45 | MASTER-SAAO | (14h 48m 23.70s , -11d 18m 23.5s) | C | 360 | 20.1 | 17208 | 2026-02-28 00:58:17 | MASTER-SAAO | (14h 50m 14.06s , -11d 32m 19.1s) | C | 120 | 19.8 | 17208 | 2026-02-28 00:58:17 | MASTER-SAAO | (14h 48m 20.45s , -11d 16m 38.4s) | C | 120 | 19.8 | 17360 | 2026-02-28 01:00:49 | MASTER-SAAO | (14h 50m 14.01s , -11d 33m 49.8s) | C | 120 | 19.8 | 17360 | 2026-02-28 01:00:49 | MASTER-SAAO | (14h 48m 20.41s , -11d 18m 08.7s) | C | 120 | 19.8 | 17512 | 2026-02-28 01:03:21 | MASTER-SAAO | (14h 50m 17.60s , -11d 32m 08.9s) | C | 120 | 19.8 | 17632 | 2026-02-28 01:03:21 | MASTER-SAAO | (14h 50m 17.60s , -11d 32m 08.9s) | C | 360 | 20.2 | 17512 | 2026-02-28 01:03:21 | MASTER-SAAO | (14h 48m 24.04s , -11d 16m 28.0s) | C | 120 | 19.8 | 17632 | 2026-02-28 01:03:21 | MASTER-SAAO | (14h 48m 24.05s , -11d 16m 27.9s) | C | 360 | 20.2 | 17664 | 2026-02-28 01:05:53 | MASTER-SAAO | (14h 50m 10.38s , -11d 32m 57.2s) | C | 120 | 19.9 | 17664 | 2026-02-28 01:05:53 | MASTER-SAAO | (14h 48m 16.83s , -11d 17m 15.8s) | C | 120 | 19.8 | 17816 | 2026-02-28 01:08:25 | MASTER-SAAO | (14h 48m 18.27s , -11d 16m 14.0s) | C | 120 | 19.9 | 17816 | 2026-02-28 01:08:25 | MASTER-SAAO | (14h 50m 11.81s , -11d 31m 55.4s) | C | 120 | 19.8 | 17968 | 2026-02-28 01:10:57 | MASTER-SAAO | (14h 48m 22.89s , -11d 17m 11.4s) | C | 120 | 19.9 | 18208 | 2026-02-28 01:10:57 | MASTER-SAAO | (14h 48m 22.89s , -11d 17m 11.4s) | C | 600 | 20.2 | 17968 | 2026-02-28 01:10:57 | MASTER-SAAO | (14h 50m 16.48s , -11d 32m 53.2s) | C | 120 | 19.8 | 18208 | 2026-02-28 01:10:57 | MASTER-SAAO | (14h 50m 16.48s , -11d 32m 53.1s) | C | 600 | 20.3 | 18121 | 2026-02-28 01:13:29 | MASTER-SAAO | (14h 48m 16.38s , -11d 18m 08.8s) | C | 120 | 19.9 | 18121 | 2026-02-28 01:13:29 | MASTER-SAAO | (14h 50m 10.00s , -11d 33m 50.7s) | C | 120 | 19.9 | 18273 | 2026-02-28 01:16:01 | MASTER-SAAO | (14h 48m 23.93s , -11d 17m 39.4s) | C | 120 | 19.8 | 18273 | 2026-02-28 01:16:01 | MASTER-SAAO | (14h 50m 17.58s , -11d 33m 21.1s) | C | 120 | 19.8 | 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/43870. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...