TITLE: GCN CIRCULAR NUMBER: 44011 SUBJECT: IceCube Alert 260315A: Global MASTER-Net observations report DATE: 26/03/15 02:40:16 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-OAFA robotic telescope [1] located in Argentina (OAFA observatory of San Juan National University) was pointed to the IceCube Alert 260315A (trigger No 46886533,11h 42m 40.32s , -01d 53m 06.0s, R=0.71) errorbox 105 sec after notice time and 224 sec after trigger time at 2026-03-15 02:22:50 UT, with upper limit up to 20.4 mag. The observations began at zenith distance = 45 deg. The sun altitude is -42.8 deg. The galactic latitude b = 57 deg., longitude l = 272 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=3187113 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 244 | 2026-03-15 02:22:50 | MASTER-OAFA | (11h 42m 55.30s , -01d 47m 48.0s) | C | 40 | 19.7 | 304 | 2026-03-15 02:22:50 | MASTER-OAFA | (11h 42m 55.30s , -01d 47m 48.0s) | C | 160 | 20.4 | Coadd 295 | 2026-03-15 02:23:36 | MASTER-OAFA | (11h 42m 55.23s , -01d 47m 46.9s) | C | 50 | 19.8 | 361 | 2026-03-15 02:24:32 | MASTER-OAFA | (11h 42m 55.19s , -01d 47m 45.7s) | C | 70 | 19.9 | 442 | 2026-03-15 02:25:48 | MASTER-OAFA | (11h 42m 55.10s , -01d 47m 45.0s) | C | 80 | 19.9 | 552 | 2026-03-15 02:25:48 | MASTER-OAFA | (11h 42m 55.10s , -01d 47m 45.0s) | C | 300 | 20.0 | Coadd 539 | 2026-03-15 02:27:15 | MASTER-OAFA | (11h 42m 54.96s , -01d 47m 43.8s) | C | 100 | 20.0 | 655 | 2026-03-15 02:29:01 | MASTER-OAFA | (11h 42m 54.80s , -01d 47m 42.7s) | C | 120 | 20.1 | 790 | 2026-03-15 02:31:07 | MASTER-OAFA | (11h 42m 54.61s , -01d 47m 41.6s) | C | 140 | 20.2 | 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/44011. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...