{ "circularId": 46036, "submittedHow": "email", "subject": "Fermi GRB 261026B: Global MASTER-Net observations report", "submitter": "Vladimir Lipunov at Moscow State U/Krylov Obs ", "eventId": "GRB 261026B", "createdOn": 1793005289672, "body": "M. Segura, F. Podesta, R.Podesta, E. Gonzalez (Observatorio Astronomico Felix Aguilar (OAFA)\n\nV.Lipunov, E.Gorbovskoy, A.Kuznetsov, K.Zhirkov, I.Panchenko, N.Tiurina, P.Balanutsa, V.Topolev, D.Vlasenko, \nG.Antipov, A.Sankovich, Yu.Tselik, Ya..Kechin, V.Senik, A.Chasovnikov, K.Labsina (Lomonosov MSU)\n\nD.Buckley (SAAO),\n\nA. Gabovich, V.Yurkov (Blagoveschensk Educational StateUniversity)\nA.Sosnovskij (Lomonosov MSU)\n\nA. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory)\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez,\nA.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory)\n\nR.Rebolo (The Instituto de Astrofisica de Canarias)\n\nO.Gress, N.Budnev(ISU)\n\n\nMASTER-OAFA robotic telescope [1] located in Argentina (OAFA observatory of San Juan National University) started inspect of the Fermi GRB 261026B ( Fermi GBM team, GCN 46032) errorbox 549 sec after notice time and 581 sec after trigger time at 2026-10-26 07:30:54 UT, with upper limit up to 18.6 mag. The observations began at zenith distance = 34 deg. The sun altitude is -26.4 deg. \n\nThe galactic latitude b = -36 deg., longitude l = 193 deg.\n\n\nReal time updated cover map and OT discovered available here: \nhttps://master.sai.msu.ru/site/master2/observ.php?id=3531853\n\nWe obtain a following upper limits. \n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 642 | 2026-10-26 07:30:54 | MASTER-OAFA | (04h 05m 24.25s , -01d 50m 38.1s) | C | 120 | 18.1 | \n 1060 | 2026-10-26 07:38:22 | MASTER-OAFA | (04h 05m 22.23s , -01d 51m 12.2s) | C | 60 | 18.1 | \n 1125 | 2026-10-26 07:39:27 | MASTER-OAFA | (04h 05m 21.90s , -01d 51m 14.1s) | C | 60 | 18.2 | \n 1190 | 2026-10-26 07:40:32 | MASTER-OAFA | (04h 05m 21.60s , -01d 51m 13.2s) | C | 60 | 18.2 | \n 1257 | 2026-10-26 07:41:39 | MASTER-OAFA | (04h 05m 21.28s , -01d 51m 12.8s) | C | 60 | 18.2 | \n 1322 | 2026-10-26 07:42:44 | MASTER-OAFA | (04h 05m 20.95s , -01d 51m 12.5s) | C | 60 | 18.2 | \n 1388 | 2026-10-26 07:43:50 | MASTER-OAFA | (04h 05m 20.63s , -01d 51m 12.3s) | C | 60 | 18.2 | \n 1454 | 2026-10-26 07:44:56 | MASTER-OAFA | (04h 05m 20.32s , -01d 51m 11.7s) | C | 60 | 18.2 | \n 1519 | 2026-10-26 07:46:01 | MASTER-OAFA | (04h 05m 19.98s , -01d 51m 11.1s) | C | 60 | 18.1 | \n 1585 | 2026-10-26 07:47:07 | MASTER-OAFA | (04h 05m 19.71s , -01d 51m 11.1s) | C | 60 | 18.2 | \n 1651 | 2026-10-26 07:48:13 | MASTER-OAFA | (04h 05m 19.39s , -01d 51m 10.6s) | C | 60 | 18.3 | \n 1717 | 2026-10-26 07:49:18 | MASTER-OAFA | (04h 05m 19.04s , -01d 51m 10.4s) | C | 60 | 18.1 | \n 1782 | 2026-10-26 07:50:24 | MASTER-OAFA | (04h 05m 18.75s , -01d 51m 09.9s) | C | 60 | 18.3 | \n 2222 | 2026-10-26 07:57:44 | MASTER-OAFA | (03h 58m 38.16s , -02d 35m 48.4s) | C | 60 | 18.2 | \n 2300 | 2026-10-26 07:59:02 | MASTER-OAFA | (03h 58m 38.15s , -02d 37m 13.8s) | C | 60 | 18.3 | \n 2376 | 2026-10-26 08:00:18 | MASTER-OAFA | (04h 06m 41.10s , -02d 35m 52.2s) | C | 60 | 18.4 | \n 2453 | 2026-10-26 08:01:35 | MASTER-OAFA | (03h 58m 34.59s , -02d 36m 40.6s) | C | 60 | 18.3 | \n 2529 | 2026-10-26 08:02:51 | MASTER-OAFA | (03h 58m 34.70s , -02d 35m 39.0s) | C | 60 | 18.3 | \n 2605 | 2026-10-26 08:04:07 | MASTER-OAFA | (04h 06m 41.81s , -02d 36m 27.4s) | C | 60 | 18.3 | \n 2680 | 2026-10-26 08:05:22 | MASTER-OAFA | (03h 58m 35.75s , -02d 37m 37.2s) | C | 60 | 18.2 | \n 2756 | 2026-10-26 08:06:38 | MASTER-OAFA | (03h 59m 08.63s , -04d 29m 59.6s) | C | 60 | 18.3 | \n 2910 | 2026-10-26 08:09:12 | MASTER-OAFA | (04h 07m 14.13s , -04d 29m 27.7s) | C | 60 | 18.2 | \n 2985 | 2026-10-26 08:10:27 | MASTER-OAFA | (04h 07m 06.86s , -04d 30m 21.1s) | C | 60 | 17.9 | \n 3060 | 2026-10-26 08:11:42 | MASTER-OAFA | (03h 59m 06.26s , -04d 29m 31.7s) | C | 60 | 17.6 | \n 3136 | 2026-10-26 08:12:58 | MASTER-OAFA | (04h 07m 12.88s , -04d 30m 19.6s) | C | 60 | 18.3 | \n 3288 | 2026-10-26 08:15:29 | MASTER-OAFA | (04h 13m 35.69s , -00d 41m 31.4s) | C | 60 | 18.4 | \n 3589 | 2026-10-26 08:20:31 | MASTER-OAFA | (04h 13m 32.59s , -00d 41m 07.8s) | C | 60 | 18.5 | \n 3740 | 2026-10-26 08:23:02 | MASTER-OAFA | (04h 13m 32.48s , -00d 43m 06.2s) | C | 60 | 18.5 | \n 3813 | 2026-10-26 08:24:15 | MASTER-OAFA | (04h 06m 13.81s , -01d 49m 03.4s) | C | 60 | 18.2 | \n 3879 | 2026-10-26 08:25:21 | MASTER-OAFA | (04h 06m 13.82s , -01d 49m 03.2s) | C | 60 | 18.4 | \n 3945 | 2026-10-26 08:26:27 | MASTER-OAFA | (04h 06m 13.79s , -01d 49m 02.4s) | C | 60 | 18.4 | \n 4011 | 2026-10-26 08:27:33 | MASTER-OAFA | (04h 06m 13.79s , -01d 49m 01.9s) | C | 60 | 18.6 | \n 4077 | 2026-10-26 08:28:39 | MASTER-OAFA | (04h 06m 13.76s , -01d 49m 01.4s) | C | 60 | 18.4 | \n 4142 | 2026-10-26 08:29:44 | MASTER-OAFA | (04h 06m 13.76s , -01d 49m 01.0s) | C | 60 | 18.2 | \n 4208 | 2026-10-26 08:30:50 | MASTER-OAFA | (04h 06m 13.78s , -01d 49m 00.7s) | C | 60 | 18.3 | \n 4274 | 2026-10-26 08:31:56 | MASTER-OAFA | (04h 06m 13.75s , -01d 49m 00.1s) | C | 60 | 18.3 | \n 4340 | 2026-10-26 08:33:02 | MASTER-OAFA | (04h 06m 13.74s , -01d 48m 59.6s) | C | 60 | 18.4 | \n 4407 | 2026-10-26 08:34:08 | MASTER-OAFA | (04h 06m 13.73s , -01d 48m 59.4s) | C | 60 | 18.4 | \n 4472 | 2026-10-26 08:35:14 | MASTER-OAFA | (04h 06m 13.74s , -01d 48m 59.3s) | C | 60 | 18.5 | \n 4537 | 2026-10-26 08:36:19 | MASTER-OAFA | (04h 06m 13.73s , -01d 48m 58.3s) | C | 60 | 18.5 | \n 5428 | 2026-10-26 08:51:10 | MASTER-OAFA | (04h 06m 41.96s , -02d 36m 04.5s) | C | 60 | 17.0 | \n 5581 | 2026-10-26 08:53:43 | MASTER-OAFA | (04h 06m 42.00s , -02d 36m 48.7s) | C | 60 | 16.4 | \n 5659 | 2026-10-26 08:55:00 | MASTER-OAFA | (04h 06m 38.77s , -02d 35m 19.7s) | C | 60 | 16.9 | \nFilter C is a clear (unfiltred) band. \n\n\nThe observation and reduction will continue. \nThe message may be cited.\n\n[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.\nhttp : // www.pereplet.ru/lipunov/625.html\n" }