TITLE: GCN CIRCULAR NUMBER: 45835 SUBJECT: SVOM GRB261007.23: Global MASTER-Net observations report DATE: 26/10/07 13:28:19 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs M. Segura, F. Podesta, R.Podesta, E. Gonzalez (Observatorio Astronomico Felix Aguilar (OAFA) 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 (Lomonosov MSU) D.Buckley (SAAO), A. Gabovich, V.Yurkov (Blagoveschensk Educational StateUniversity) A.Sosnovskij (Lomonosov MSU) A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory) L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory) R.Rebolo (The Instituto de Astrofisica de Canarias) O.Gress, N.Budnev(ISU) MASTER-OAFA robotic telescope [1] located in Argentina (OAFA observatory of San Juan National University) was pointed to the SVOM GRB261007.23 (trigger No 1791351478,00h 46m 18.89s , -17d 40m 11.3s, R=0.1602) errorbox 11 sec after notice time and 952 sec after trigger time at 2026-10-07 05:53:50 UT, with upper limit up to 21.4 mag. The observations began at zenith distance = 26 deg. The sun altitude is -47.1 deg. The galactic latitude b = -80 deg., longitude l = 119 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=3521224 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 982 | 2026-10-07 05:53:50 | MASTER-OAFA | (00h 45m 11.15s , -17d 46m 58.6s) | C | 60 | 20.7 | 1042 | 2026-10-07 05:53:50 | MASTER-OAFA | (00h 45m 11.14s , -17d 46m 58.5s) | C | 180 | 21.4 | Coadd 1048 | 2026-10-07 05:54:56 | MASTER-OAFA | (00h 45m 11.10s , -17d 47m 01.3s) | C | 60 | 20.6 | 1114 | 2026-10-07 05:56:01 | MASTER-OAFA | (00h 45m 11.06s , -17d 47m 03.9s) | C | 60 | 20.6 | 1180 | 2026-10-07 05:57:07 | MASTER-OAFA | (00h 45m 11.01s , -17d 47m 06.8s) | C | 60 | 20.7 | 1240 | 2026-10-07 05:57:07 | MASTER-OAFA | (00h 45m 11.00s , -17d 47m 06.8s) | C | 180 | 21.4 | Coadd 1245 | 2026-10-07 05:58:13 | MASTER-OAFA | (00h 45m 10.96s , -17d 47m 09.5s) | C | 60 | 20.6 | 1311 | 2026-10-07 05:59:18 | MASTER-OAFA | (00h 45m 10.93s , -17d 47m 12.3s) | C | 60 | 20.6 | 1376 | 2026-10-07 06:00:24 | MASTER-OAFA | (00h 45m 10.88s , -17d 47m 15.1s) | C | 60 | 20.6 | 1436 | 2026-10-07 06:00:24 | MASTER-OAFA | (00h 45m 10.88s , -17d 47m 15.1s) | C | 180 | 21.4 | Coadd 1442 | 2026-10-07 06:01:30 | MASTER-OAFA | (00h 45m 10.84s , -17d 47m 18.0s) | C | 60 | 20.7 | 1508 | 2026-10-07 06:02:36 | MASTER-OAFA | (00h 45m 10.80s , -17d 47m 20.9s) | C | 60 | 20.6 | 1574 | 2026-10-07 06:03:42 | MASTER-OAFA | (00h 45m 10.76s , -17d 47m 23.6s) | C | 60 | 20.6 | 1634 | 2026-10-07 06:03:42 | MASTER-OAFA | (00h 45m 10.76s , -17d 47m 23.6s) | C | 180 | 21.3 | Coadd 1640 | 2026-10-07 06:04:47 | MASTER-OAFA | (00h 45m 10.71s , -17d 47m 26.4s) | C | 60 | 20.6 | 1705 | 2026-10-07 06:05:53 | MASTER-OAFA | (00h 45m 10.68s , -17d 47m 29.2s) | C | 60 | 20.6 | 1771 | 2026-10-07 06:06:59 | MASTER-OAFA | (00h 45m 10.63s , -17d 47m 32.1s) | C | 60 | 20.6 | 1831 | 2026-10-07 06:06:59 | MASTER-OAFA | (00h 45m 10.62s , -17d 47m 32.0s) | C | 180 | 21.3 | Coadd 1837 | 2026-10-07 06:08:04 | MASTER-OAFA | (00h 45m 10.60s , -17d 47m 35.3s) | C | 60 | 20.7 | 1903 | 2026-10-07 06:09:10 | MASTER-OAFA | (00h 45m 10.55s , -17d 47m 38.1s) | C | 60 | 20.6 | 1969 | 2026-10-07 06:10:16 | MASTER-OAFA | (00h 45m 10.51s , -17d 47m 41.1s) | C | 60 | 20.6 | 2029 | 2026-10-07 06:10:16 | MASTER-OAFA | (00h 45m 10.51s , -17d 47m 41.1s) | C | 180 | 20.9 | Coadd 2034 | 2026-10-07 06:11:22 | MASTER-OAFA | (00h 45m 10.45s , -17d 47m 43.7s) | C | 60 | 19.9 | 2100 | 2026-10-07 06:12:28 | MASTER-OAFA | (00h 45m 10.38s , -17d 47m 46.7s) | C | 60 | 19.3 | 2166 | 2026-10-07 06:13:34 | MASTER-OAFA | (00h 45m 10.34s , -17d 47m 49.6s) | C | 60 | 19.0 | 2226 | 2026-10-07 06:13:34 | MASTER-OAFA | (00h 45m 10.34s , -17d 47m 49.5s) | C | 180 | 19.4 | Coadd 2232 | 2026-10-07 06:14:39 | MASTER-OAFA | (00h 45m 10.28s , -17d 47m 52.2s) | C | 60 | 18.5 | 2297 | 2026-10-07 06:15:45 | MASTER-OAFA | (00h 45m 10.23s , -17d 47m 55.5s) | C | 60 | 18.4 | 2364 | 2026-10-07 06:16:51 | MASTER-OAFA | (00h 45m 10.18s , -17d 47m 58.4s) | C | 60 | 18.5 | 2424 | 2026-10-07 06:16:51 | MASTER-OAFA | (00h 45m 10.19s , -17d 47m 58.4s) | C | 180 | 19.3 | Coadd 2429 | 2026-10-07 06:17:57 | MASTER-OAFA | (00h 45m 10.12s , -17d 48m 01.8s) | C | 60 | 18.5 | 2495 | 2026-10-07 06:19:03 | MASTER-OAFA | (00h 45m 10.10s , -17d 48m 04.6s) | C | 60 | 18.4 | 2615 | 2026-10-07 06:21:02 | MASTER-OAFA | (00h 45m 33.08s , -17d 44m 59.2s) | C | 60 | 18.7 | 2675 | 2026-10-07 06:21:02 | MASTER-OAFA | (00h 45m 33.08s , -17d 44m 59.2s) | C | 180 | 18.9 | Coadd 2680 | 2026-10-07 06:22:08 | MASTER-OAFA | (00h 45m 33.07s , -17d 44m 58.3s) | C | 60 | 18.2 | 2746 | 2026-10-07 06:23:13 | MASTER-OAFA | (00h 45m 33.06s , -17d 44m 57.4s) | C | 60 | 17.8 | 2812 | 2026-10-07 06:24:19 | MASTER-OAFA | (00h 45m 33.06s , -17d 44m 56.8s) | C | 60 | 16.3 | 2922 | 2026-10-07 06:24:19 | MASTER-OAFA | (00h 45m 33.06s , -17d 44m 56.8s) | C | 280 | 19.5 | Coadd 4671 | 2026-10-07 06:54:59 | MASTER-OAFA | (00h 45m 40.99s , -17d 45m 01.6s) | C | 100 | 19.7 | 4787 | 2026-10-07 06:56:45 | MASTER-OAFA | (00h 45m 41.02s , -17d 45m 00.3s) | C | 120 | 17.9 | 4923 | 2026-10-07 06:58:51 | MASTER-OAFA | (00h 45m 41.02s , -17d 44m 59.8s) | C | 140 | 18.0 | 5085 | 2026-10-07 07:01:17 | MASTER-OAFA | (00h 45m 41.07s , -17d 44m 59.5s) | C | 170 | 17.0 | 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