TITLE: GCN CIRCULAR NUMBER: 37570 SUBJECT: EP EP240919a: Global MASTER-Net observations report DATE: 24/09/20 12:36:38 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru> V. Lipunov, V.Kornilov, E. Gorbovskoy, K. Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.Senik, D. Vlasenko, G.Antipov, D.Zimnukhov, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D. Cheryasov, Ya.Kechin, Yu.Tselik, A. Sosnovskij (Lomonosov Moscow State University, SAI, Physics Department), R. Podesta, C.Lopez, F. Podesta, C.Francile (Observatorio Astronomico Felix Aguilar OAFA), R. Rebolo, M. Serra (The Instituto de Astrofisica de Canarias), D. Buckley (South African Astronomical Observatory), O.A. Gress, N.M. Budnev, O.Ershova (Irkutsk State University, API), L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), V. Yurkov, A. Gabovich (Blagoveschensk Educational State University) MASTER-Amur robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Blagoveshchensk State Pedagogical University) was pointed to the EP240919a ( EP Team et al., GCN 37561) errorbox 12623 sec after notice time and 73512 sec after trigger time at 2024-09-20 11:12:52 UT, with upper limit up to 17.0 mag. Observations started at twilight. The observations began at zenith distance = 69 deg. The sun altitude is -16.3 deg. The galactic latitude b = -50 deg., longitude l = 52 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2609045 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 73602 | 2024-09-20 11:12:52 | MASTER-Amur | (22h 21m 01.02s , -09d 49m 04.0s) | C | 180 | 15.3 | 73602 | 2024-09-20 11:12:52 | MASTER-Amur | (22h 20m 20.62s , -09d 22m 23.0s) | C | 180 | 16.8 | 73802 | 2024-09-20 11:16:11 | MASTER-Amur | (22h 21m 00.87s , -09d 48m 23.3s) | C | 180 | 15.6 | 73802 | 2024-09-20 11:16:11 | MASTER-Amur | (22h 20m 20.81s , -09d 21m 42.3s) | C | 180 | 17.0 | 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/37570. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...