TITLE: GCN CIRCULAR NUMBER: 36990 SUBJECT: Fermi trigger No 744083370: Global MASTER-Net observations report DATE: 24/07/31 20:30:49 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-Tavrida robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, SAI Crimea astronomical station) started inspect of the Fermi GRB240731.08 (trigger No 744083370,10h 25m 52.80s , +33d 57m 00.0s, R=7.3) errorbox 64257 sec after notice time and 64262 sec after trigger time at 2024-07-31 19:40:28 UT, with upper limit up to 17.5 mag. The observations began at zenith distance = 81 deg. The sun altitude is -21.3 deg. The galactic latitude b = 59 deg., longitude l = 192 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2546590 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 64293 | 2024-07-31 19:40:28 | MASTER-Tavrida | (10h 37m 12.36s , +38d 34m 56.5s) | C | 60 | 17.4 | 64370 | 2024-07-31 19:41:45 | MASTER-Tavrida | (10h 54m 01.42s , +35d 59m 11.0s) | C | 60 | 17.0 | 64445 | 2024-07-31 19:43:00 | MASTER-Tavrida | (10h 52m 12.10s , +37d 17m 13.5s) | C | 60 | 17.4 | 64522 | 2024-07-31 19:44:17 | MASTER-Tavrida | (10h 35m 36.15s , +39d 52m 33.0s) | C | 60 | 17.3 | 64598 | 2024-07-31 19:45:33 | MASTER-Tavrida | (10h 50m 30.29s , +38d 34m 20.7s) | C | 60 | 17.4 | 64761 | 2024-07-31 19:48:17 | MASTER-Tavrida | (10h 49m 11.05s , +39d 53m 20.9s) | C | 60 | 17.5 | 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/36990. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...