TITLE: GCN CIRCULAR NUMBER: 44298 SUBJECT: Fermi trigger No 797912738: Global MASTER-Net observations report DATE: 26/04/15 04:31:12 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-OAGH robotic telescope [1] located in Mexico (OAGH National Institute for Astrophysics, Optics and Electronics) started inspect of the Fermi GRB260415.10 (trigger No 797912738,14h 44m 00.00s , +19d 21m 00.0s, R=6.21) errorbox 6140 sec after notice time and 6176 sec after trigger time at 2026-04-15 04:08:29 UT, with upper limit up to 19.8 mag. The observations began at zenith distance = 58 deg. The sun altitude is -29.0 deg. The galactic latitude b = 62 deg., longitude l = 22 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=3252523 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 6206 | 2026-04-15 04:08:29 | MASTER-OAGH | (14h 36m 16.77s , +18d 18m 58.5s) | C | 60 | 19.6 | 6206 | 2026-04-15 04:08:29 | MASTER-OAGH | (14h 37m 29.78s , +17d 44m 59.9s) | C | 60 | 19.8 | 6277 | 2026-04-15 04:09:40 | MASTER-OAGH | (14h 44m 35.36s , +18d 17m 56.2s) | C | 60 | 19.6 | 6277 | 2026-04-15 04:09:40 | MASTER-OAGH | (14h 45m 47.91s , +17d 43m 56.2s) | C | 60 | 19.6 | 6414 | 2026-04-15 04:11:57 | MASTER-OAGH | (14h 30m 17.59s , +20d 12m 49.5s) | C | 60 | 19.6 | 6414 | 2026-04-15 04:11:57 | MASTER-OAGH | (14h 31m 31.50s , +19d 38m 52.0s) | C | 60 | 19.6 | 6486 | 2026-04-15 04:13:09 | MASTER-OAGH | (14h 38m 42.62s , +20d 11m 48.8s) | C | 60 | 19.7 | 6486 | 2026-04-15 04:13:09 | MASTER-OAGH | (14h 39m 56.27s , +19d 37m 50.5s) | C | 60 | 19.8 | 6827 | 2026-04-15 04:18:50 | MASTER-OAGH | (14h 36m 11.16s , +18d 19m 41.4s) | C | 60 | 19.7 | 6827 | 2026-04-15 04:18:50 | MASTER-OAGH | (14h 37m 24.26s , +17d 45m 44.5s) | C | 60 | 19.8 | 6900 | 2026-04-15 04:20:03 | MASTER-OAGH | (14h 44m 41.90s , +18d 18m 39.3s) | C | 60 | 19.6 | 6900 | 2026-04-15 04:20:03 | MASTER-OAGH | (14h 45m 54.73s , +17d 44m 41.1s) | C | 60 | 19.7 | 7036 | 2026-04-15 04:22:19 | MASTER-OAGH | (14h 30m 11.15s , +20d 13m 35.1s) | C | 60 | 19.6 | 7036 | 2026-04-15 04:22:19 | MASTER-OAGH | (14h 31m 25.61s , +19d 39m 38.3s) | C | 60 | 19.6 | 7108 | 2026-04-15 04:23:31 | MASTER-OAGH | (14h 38m 48.80s , +20d 12m 34.4s) | C | 60 | 19.8 | 7108 | 2026-04-15 04:23:31 | MASTER-OAGH | (14h 40m 03.05s , +19d 38m 36.8s) | C | 60 | 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/44298. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...