TITLE: GCN CIRCULAR NUMBER: 45122 SUBJECT: IceCube Alert 260709A: Global MASTER-Net observations report DATE: 26/07/09 01:40:15 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), M. Segura, 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 260709A (trigger No 7869742,19h 31m 14.40s , -15d 10m 12.0s, R=0.47) errorbox 26953 sec after notice time and 27118 sec after trigger time at 2026-07-09 00:49:40 UT, with upper limit up to 19.4 mag. The observations began at zenith distance = 59 deg. The sun altitude is -38.3 deg. The galactic latitude b = -16 deg., longitude l = 24 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=3421037 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 27148 | 2026-07-09 00:49:40 | MASTER-OAFA | (19h 30m 06.32s , -15d 10m 17.3s) | C | 60 | 16.9 | 27208 | 2026-07-09 00:49:40 | MASTER-OAFA | (19h 30m 06.31s , -15d 10m 17.2s) | C | 180 | 17.4 | Coadd 27228 | 2026-07-09 00:51:00 | MASTER-OAFA | (19h 30m 06.41s , -15d 11m 45.7s) | C | 60 | 17.0 | 27305 | 2026-07-09 00:52:17 | MASTER-OAFA | (19h 30m 09.68s , -15d 10m 37.9s) | C | 60 | 17.4 | 27402 | 2026-07-09 00:53:54 | MASTER-OAFA | (19h 30m 03.99s , -15d 11m 03.0s) | C | 60 | 18.0 | 27462 | 2026-07-09 00:53:54 | MASTER-OAFA | (19h 30m 03.99s , -15d 11m 03.0s) | C | 180 | 18.7 | Coadd 27477 | 2026-07-09 00:55:09 | MASTER-OAFA | (19h 30m 04.40s , -15d 09m 58.9s) | C | 60 | 18.5 | 27553 | 2026-07-09 00:56:25 | MASTER-OAFA | (19h 30m 08.71s , -15d 10m 56.6s) | C | 60 | 18.9 | 27631 | 2026-07-09 00:57:43 | MASTER-OAFA | (19h 30m 02.58s , -15d 11m 52.6s) | C | 60 | 19.0 | 27691 | 2026-07-09 00:57:43 | MASTER-OAFA | (19h 30m 02.58s , -15d 11m 52.6s) | C | 180 | 19.4 | Coadd 27710 | 2026-07-09 00:59:02 | MASTER-OAFA | (19h 30m 09.79s , -15d 11m 21.7s) | C | 60 | 19.0 | 27785 | 2026-07-09 01:00:17 | MASTER-OAFA | (19h 30m 06.55s , -15d 09m 52.2s) | C | 60 | 19.0 | 27894 | 2026-07-09 01:01:36 | MASTER-OAFA | (19h 30m 06.54s , -15d 11m 32.2s) | C | 120 | 18.9 | 28014 | 2026-07-09 01:01:36 | MASTER-OAFA | (19h 30m 06.54s , -15d 11m 32.2s) | C | 360 | 19.3 | Coadd 28033 | 2026-07-09 01:03:55 | MASTER-OAFA | (19h 30m 10.13s , -15d 10m 05.9s) | C | 120 | 18.9 | 28170 | 2026-07-09 01:06:12 | MASTER-OAFA | (19h 30m 03.95s , -15d 10m 29.8s) | C | 120 | 19.0 | 28416 | 2026-07-09 01:10:18 | MASTER-OAFA | (19h 30m 09.10s , -15d 10m 24.0s) | C | 120 | 18.8 | 28536 | 2026-07-09 01:10:18 | MASTER-OAFA | (19h 30m 09.10s , -15d 10m 24.0s) | C | 360 | 19.1 | Coadd 28551 | 2026-07-09 01:12:33 | MASTER-OAFA | (19h 30m 02.60s , -15d 11m 18.1s) | C | 120 | 18.6 | 28684 | 2026-07-09 01:14:46 | MASTER-OAFA | (19h 30m 09.44s , -15d 11m 01.1s) | C | 120 | 18.7 | 28823 | 2026-07-09 01:17:05 | MASTER-OAFA | (19h 30m 06.57s , -15d 09m 18.7s) | C | 120 | 18.7 | 28959 | 2026-07-09 01:19:21 | MASTER-OAFA | (19h 30m 06.54s , -15d 10m 33.6s) | C | 120 | 18.9 | 29098 | 2026-07-09 01:21:40 | MASTER-OAFA | (19h 30m 09.79s , -15d 08m 58.3s) | C | 120 | 19.1 | 29235 | 2026-07-09 01:23:57 | MASTER-OAFA | (19h 30m 03.25s , -15d 09m 51.7s) | C | 120 | 19.2 | 29373 | 2026-07-09 01:26:15 | MASTER-OAFA | (19h 30m 02.88s , -15d 08m 46.5s) | C | 120 | 19.3 | 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/45122. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...