TITLE: GCN CIRCULAR NUMBER: 41018 SUBJECT: IceCube Alert 250706.55: Global MASTER-Net observations report DATE: 25/07/07 19:39:20 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 (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Argentina (OAFA observatory of San Juan National University) was pointed to the IceCube Alert 250706.55 (trigger No 37015490,17h 43m 54.48s , +38d 59m 38.4s, R=0.6) errorbox 58565 sec after notice time and 58603 sec after trigger time at 2025-07-07 05:31:23 UT, with upper limit up to 18.5 mag. The observations began at zenith distance = 76 deg. The sun altitude is -75.7 deg. MASTER-Tavrida robotic telescope located in Russia (Lomonosov MSU, SAI Crimea astronomical station) was pointed to the IceCube Alert 250706.55 errorbox 1 days 20760 sec after notice time and 1 days 20797 sec after trigger time at 2025-07-07 19:01:17 UT, with upper limit up to 14.9 mag. Observations started at twilight. The observations began at zenith distance = 16 deg. The sun altitude is -13.3 deg. The galactic latitude b = 29 deg., longitude l = 65 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2927494 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 58633 | 2025-07-07 05:31:23 | MASTER-OAFA | (17h 52m 43.98s , +39d 48m 07.5s) | C | 60 | 17.9 | 58693 | 2025-07-07 05:31:23 | MASTER-OAFA | (17h 52m 43.98s , +39d 48m 07.6s) | C | 180 | 18.5 | Coadd 58708 | 2025-07-07 05:32:38 | MASTER-OAFA | (17h 52m 37.32s , +39d 47m 39.5s) | C | 60 | 17.9 | 58782 | 2025-07-07 05:33:52 | MASTER-OAFA | (17h 52m 36.76s , +39d 48m 41.6s) | C | 60 | 17.9 | 58857 | 2025-07-07 05:35:07 | MASTER-OAFA | (17h 52m 42.61s , +39d 47m 42.4s) | C | 60 | 17.9 | 58931 | 2025-07-07 05:36:20 | MASTER-OAFA | (17h 52m 35.82s , +39d 46m 43.9s) | C | 60 | 17.8 | 59005 | 2025-07-07 05:37:34 | MASTER-OAFA | (17h 52m 41.21s , +39d 47m 10.1s) | C | 60 | 17.8 | 107228 | 2025-07-07 19:01:17 | MASTER-Tavrida | (17h 43m 55.10s , +39d 01m 11.7s) | C | 60 | 14.9 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited. View this GCN Circular online at https://gcn.nasa.gov/circulars/41018. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...