TITLE: GCN CIRCULAR NUMBER: 44627 SUBJECT: SVOM GRB 260515A: Global MASTER-Net observations report DATE: 26/05/15 21:53:05 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-Tavrida robotic telescope [1] located in Russia (Lomonosov MSU, SAI Crimea astronomical station) was pointed to the SVOM GRB 260515A ( SVOM/ECLAIRs Commissioning Team et al., GCN 44622) errorbox 30 sec after notice time and 659 sec after trigger time at 2026-05-15 19:19:18 UT, with upper limit up to 19.9 mag. The observations began at zenith distance = 32 deg. The sun altitude is -18.8 deg. The galactic latitude b = 58 deg., longitude l = 36 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=3316887 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 719 | 2026-05-15 19:19:18 | MASTER-Tavrida | (15h 10m 30.15s , +24d 42m 28.1s) | C | 120 | 18.8 | 842 | 2026-05-15 19:21:20 | MASTER-Tavrida | (15h 10m 30.34s , +24d 42m 18.6s) | C | 120 | 19.1 | 965 | 2026-05-15 19:23:23 | MASTER-Tavrida | (15h 10m 30.45s , +24d 42m 11.4s) | C | 120 | 19.1 | 1087 | 2026-05-15 19:25:26 | MASTER-Tavrida | (15h 10m 30.55s , +24d 42m 04.2s) | C | 120 | 18.9 | 1210 | 2026-05-15 19:27:28 | MASTER-Tavrida | (15h 10m 30.61s , +24d 41m 58.5s) | C | 120 | 19.4 | 1332 | 2026-05-15 19:29:31 | MASTER-Tavrida | (15h 10m 30.65s , +24d 41m 52.9s) | C | 120 | 19.4 | 1455 | 2026-05-15 19:31:33 | MASTER-Tavrida | (15h 10m 30.66s , +24d 41m 47.7s) | C | 120 | 19.5 | 1577 | 2026-05-15 19:33:36 | MASTER-Tavrida | (15h 10m 30.65s , +24d 41m 42.7s) | C | 120 | 19.5 | 1700 | 2026-05-15 19:35:38 | MASTER-Tavrida | (15h 10m 30.62s , +24d 41m 38.1s) | C | 120 | 19.6 | 1822 | 2026-05-15 19:37:41 | MASTER-Tavrida | (15h 10m 30.62s , +24d 41m 33.2s) | C | 120 | 19.6 | 1945 | 2026-05-15 19:39:44 | MASTER-Tavrida | (15h 10m 30.62s , +24d 41m 28.5s) | C | 120 | 19.6 | 2068 | 2026-05-15 19:41:46 | MASTER-Tavrida | (15h 10m 30.61s , +24d 41m 24.0s) | C | 120 | 19.6 | 2190 | 2026-05-15 19:43:49 | MASTER-Tavrida | (15h 10m 30.62s , +24d 41m 19.0s) | C | 120 | 19.6 | 2313 | 2026-05-15 19:45:52 | MASTER-Tavrida | (15h 10m 30.63s , +24d 41m 14.6s) | C | 120 | 19.5 | 2436 | 2026-05-15 19:47:54 | MASTER-Tavrida | (15h 10m 30.61s , +24d 41m 09.9s) | C | 120 | 19.6 | 2558 | 2026-05-15 19:49:57 | MASTER-Tavrida | (15h 10m 30.58s , +24d 41m 05.5s) | C | 120 | 19.6 | 2681 | 2026-05-15 19:51:59 | MASTER-Tavrida | (15h 10m 30.55s , +24d 41m 00.9s) | C | 120 | 19.6 | 2804 | 2026-05-15 19:54:02 | MASTER-Tavrida | (15h 10m 30.53s , +24d 40m 56.5s) | C | 120 | 19.7 | 2926 | 2026-05-15 19:56:05 | MASTER-Tavrida | (15h 10m 30.51s , +24d 40m 52.0s) | C | 120 | 19.6 | 3049 | 2026-05-15 19:58:07 | MASTER-Tavrida | (15h 10m 30.50s , +24d 40m 47.5s) | C | 120 | 19.7 | 3179 | 2026-05-15 20:00:18 | MASTER-Tavrida | (15h 10m 34.07s , +24d 41m 17.5s) | C | 120 | 19.7 | 3302 | 2026-05-15 20:02:20 | MASTER-Tavrida | (15h 10m 34.06s , +24d 41m 13.1s) | C | 120 | 19.7 | 3424 | 2026-05-15 20:04:23 | MASTER-Tavrida | (15h 10m 34.06s , +24d 41m 08.9s) | C | 120 | 19.7 | 3547 | 2026-05-15 20:06:26 | MASTER-Tavrida | (15h 10m 34.02s , +24d 41m 04.4s) | C | 120 | 19.7 | 3670 | 2026-05-15 20:08:28 | MASTER-Tavrida | (15h 10m 34.02s , +24d 41m 00.1s) | C | 120 | 19.7 | 3793 | 2026-05-15 20:10:31 | MASTER-Tavrida | (15h 10m 34.02s , +24d 40m 55.8s) | C | 120 | 19.7 | 3915 | 2026-05-15 20:12:34 | MASTER-Tavrida | (15h 10m 34.02s , +24d 40m 51.4s) | C | 120 | 19.7 | 4038 | 2026-05-15 20:14:36 | MASTER-Tavrida | (15h 10m 34.01s , +24d 40m 47.0s) | C | 120 | 19.7 | 4161 | 2026-05-15 20:16:39 | MASTER-Tavrida | (15h 10m 34.00s , +24d 40m 42.8s) | C | 120 | 19.6 | 4283 | 2026-05-15 20:18:42 | MASTER-Tavrida | (15h 10m 34.02s , +24d 40m 38.5s) | C | 120 | 19.8 | 4406 | 2026-05-15 20:20:44 | MASTER-Tavrida | (15h 10m 34.01s , +24d 40m 34.2s) | C | 120 | 19.9 | 4529 | 2026-05-15 20:22:47 | MASTER-Tavrida | (15h 10m 34.01s , +24d 40m 30.0s) | C | 120 | 19.9 | 4651 | 2026-05-15 20:24:50 | MASTER-Tavrida | (15h 10m 33.97s , +24d 40m 26.2s) | C | 120 | 19.8 | 4774 | 2026-05-15 20:26:53 | MASTER-Tavrida | (15h 10m 33.93s , +24d 40m 22.2s) | C | 120 | 19.8 | 4897 | 2026-05-15 20:28:55 | MASTER-Tavrida | (15h 10m 33.91s , +24d 40m 17.9s) | C | 120 | 19.9 | 5020 | 2026-05-15 20:30:58 | MASTER-Tavrida | (15h 10m 33.93s , +24d 40m 13.4s) | C | 120 | 19.9 | 5143 | 2026-05-15 20:33:01 | MASTER-Tavrida | (15h 10m 33.94s , +24d 40m 09.2s) | C | 120 | 19.9 | 5265 | 2026-05-15 20:35:04 | MASTER-Tavrida | (15h 10m 33.96s , +24d 40m 04.8s) | C | 120 | 19.9 | 5388 | 2026-05-15 20:37:06 | MASTER-Tavrida | (15h 10m 33.97s , +24d 40m 00.6s) | C | 120 | 19.9 | 5510 | 2026-05-15 20:39:09 | MASTER-Tavrida | (15h 10m 33.95s , +24d 39m 56.5s) | C | 120 | 19.9 | 5633 | 2026-05-15 20:41:12 | MASTER-Tavrida | (15h 10m 33.91s , +24d 39m 52.7s) | C | 120 | 19.8 | 5756 | 2026-05-15 20:43:14 | MASTER-Tavrida | (15h 10m 33.93s , +24d 39m 48.3s) | C | 120 | 19.9 | 5878 | 2026-05-15 20:45:17 | MASTER-Tavrida | (15h 10m 33.94s , +24d 39m 43.8s) | C | 120 | 19.9 | 6001 | 2026-05-15 20:47:20 | MASTER-Tavrida | (15h 10m 33.96s , +24d 39m 39.5s) | C | 120 | 19.9 | 6124 | 2026-05-15 20:49:23 | MASTER-Tavrida | (15h 10m 33.99s , +24d 39m 35.1s) | C | 120 | 19.9 | 6246 | 2026-05-15 20:51:25 | MASTER-Tavrida | (15h 10m 33.93s , +24d 39m 31.4s) | C | 120 | 19.7 | 6369 | 2026-05-15 20:53:28 | MASTER-Tavrida | (15h 10m 33.93s , +24d 39m 27.2s) | C | 120 | 19.9 | 6492 | 2026-05-15 20:55:31 | MASTER-Tavrida | (15h 10m 33.95s , +24d 39m 22.9s) | C | 120 | 19.8 | 6615 | 2026-05-15 20:57:33 | MASTER-Tavrida | (15h 10m 34.00s , +24d 39m 18.6s) | C | 120 | 19.9 | 6737 | 2026-05-15 20:59:36 | MASTER-Tavrida | (15h 10m 34.00s , +24d 39m 14.5s) | C | 120 | 19.9 | 6860 | 2026-05-15 21:01:38 | MASTER-Tavrida | (15h 10m 34.02s , +24d 39m 10.3s) | C | 120 | 19.9 | 6983 | 2026-05-15 21:03:41 | MASTER-Tavrida | (15h 10m 34.07s , +24d 39m 06.1s) | C | 120 | 19.8 | 7105 | 2026-05-15 21:05:44 | MASTER-Tavrida | (15h 10m 34.10s , +24d 39m 01.9s) | C | 120 | 19.9 | 7228 | 2026-05-15 21:07:46 | MASTER-Tavrida | (15h 10m 34.10s , +24d 38m 57.7s) | C | 120 | 19.9 | 7350 | 2026-05-15 21:09:49 | MASTER-Tavrida | (15h 10m 34.11s , +24d 38m 53.5s) | C | 120 | 19.7 | 7472 | 2026-05-15 21:11:51 | MASTER-Tavrida | (15h 10m 34.14s , +24d 38m 49.3s) | C | 120 | 19.8 | 7595 | 2026-05-15 21:13:54 | MASTER-Tavrida | (15h 10m 34.17s , +24d 38m 45.0s) | C | 120 | 19.8 | 7718 | 2026-05-15 21:15:56 | MASTER-Tavrida | (15h 10m 34.22s , +24d 38m 40.5s) | C | 120 | 19.8 | 7840 | 2026-05-15 21:17:58 | MASTER-Tavrida | (15h 10m 34.23s , +24d 38m 36.3s) | C | 120 | 19.9 | 7962 | 2026-05-15 21:20:01 | MASTER-Tavrida | (15h 10m 34.25s , +24d 38m 31.9s) | C | 120 | 19.9 | 8085 | 2026-05-15 21:22:03 | MASTER-Tavrida | (15h 10m 34.28s , +24d 38m 27.7s) | C | 120 | 19.8 | 8207 | 2026-05-15 21:24:06 | MASTER-Tavrida | (15h 10m 34.33s , +24d 38m 23.2s) | C | 120 | 19.9 | 8330 | 2026-05-15 21:26:08 | MASTER-Tavrida | (15h 10m 34.34s , +24d 38m 19.1s) | C | 120 | 19.9 | 8452 | 2026-05-15 21:28:11 | MASTER-Tavrida | (15h 10m 34.36s , +24d 38m 14.5s) | C | 120 | 19.9 | 8575 | 2026-05-15 21:30:14 | MASTER-Tavrida | (15h 10m 34.36s , +24d 38m 09.9s) | C | 120 | 19.8 | 8698 | 2026-05-15 21:32:16 | MASTER-Tavrida | (15h 10m 34.41s , +24d 38m 05.3s) | C | 120 | 19.9 | 8820 | 2026-05-15 21:34:19 | MASTER-Tavrida | (15h 10m 34.43s , +24d 38m 00.8s) | C | 120 | 19.9 | 8943 | 2026-05-15 21:36:21 | MASTER-Tavrida | (15h 10m 34.46s , +24d 37m 56.3s) | C | 120 | 19.9 | 9065 | 2026-05-15 21:38:24 | MASTER-Tavrida | (15h 10m 34.51s , +24d 37m 51.7s) | C | 120 | 19.9 | 9188 | 2026-05-15 21:40:27 | MASTER-Tavrida | (15h 10m 34.53s , +24d 37m 47.2s) | C | 120 | 19.8 | 9311 | 2026-05-15 21:42:29 | MASTER-Tavrida | (15h 10m 34.57s , +24d 37m 42.6s) | C | 120 | 19.8 | 9433 | 2026-05-15 21:44:32 | MASTER-Tavrida | (15h 10m 34.59s , +24d 37m 38.0s) | 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/44627. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...