TITLE: GCN CIRCULAR NUMBER: 36985 SUBJECT: Fermi GRB 240730B: Global MASTER-Net observations report DATE: 24/07/30 20:30:44 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-SAAO robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in South Africa (South African Astronomical Observatory) started inspect of the Fermi GRB 240730B ( Fermi GBM team, GCN 36984) errorbox 576 sec after notice time and 588 sec after trigger time at 2024-07-30 19:48:06 UT, with upper limit up to 19.2 mag. The observations began at zenith distance = 82 deg. The sun altitude is -48.0 deg. The galactic latitude b = 80 deg., longitude l = 10 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2546199 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 618 | 2024-07-30 19:48:06 | MASTER-SAAO | (13h 29m 10.06s , +23d 17m 14.3s) | C | 60 | 18.6 | 678 | 2024-07-30 19:48:06 | MASTER-SAAO | (13h 29m 10.06s , +23d 17m 14.4s) | C | 180 | 19.2 | Coadd 697 | 2024-07-30 19:49:25 | MASTER-SAAO | (13h 29m 09.53s , +23d 17m 20.0s) | C | 60 | 18.5 | 776 | 2024-07-30 19:50:44 | MASTER-SAAO | (13h 29m 09.12s , +23d 17m 24.9s) | C | 60 | 18.5 | 855 | 2024-07-30 19:52:03 | MASTER-SAAO | (13h 29m 08.65s , +23d 17m 31.0s) | C | 60 | 18.6 | 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/36985. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...