TITLE: GCN CIRCULAR NUMBER: 36991 SUBJECT: Fermi trigger No 744128417: Global MASTER-Net observations report DATE: 24/07/31 20:31:15 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 GRB240731.60 (trigger No 744128417,00h 34m 36.00s , -46d 16m 12.0s, R=6.55) errorbox 15869 sec after notice time and 15891 sec after trigger time at 2024-07-31 18:45:04 UT, with upper limit up to 19.3 mag. The observations began at zenith distance = 78 deg. The sun altitude is -34.6 deg. The galactic latitude b = -71 deg., longitude l = 311 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2547291 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 15922 | 2024-07-31 18:45:04 | MASTER-SAAO | (00h 13m 25.27s , -50d 09m 46.8s) | C | 60 | 18.8 | 16001 | 2024-07-31 18:46:23 | MASTER-SAAO | (00h 25m 51.10s , -50d 10m 08.0s) | C | 60 | 18.9 | 16080 | 2024-07-31 18:47:42 | MASTER-SAAO | (00h 12m 49.83s , -48d 16m 31.0s) | C | 60 | 18.9 | 16160 | 2024-07-31 18:49:02 | MASTER-SAAO | (00h 14m 02.96s , -52d 03m 43.4s) | C | 60 | 19.0 | 16239 | 2024-07-31 18:50:21 | MASTER-SAAO | (00h 27m 05.93s , -52d 04m 43.2s) | C | 60 | 19.1 | 16568 | 2024-07-31 18:55:50 | MASTER-SAAO | (00h 38m 43.31s , -52d 04m 40.0s) | C | 60 | 18.9 | 16647 | 2024-07-31 18:57:09 | MASTER-SAAO | (00h 12m 10.43s , -46d 23m 26.3s) | C | 60 | 18.7 | 16727 | 2024-07-31 18:58:29 | MASTER-SAAO | (00h 40m 37.01s , -53d 56m 35.2s) | C | 60 | 18.7 | 16806 | 2024-07-31 18:59:48 | MASTER-SAAO | (00h 54m 20.79s , -53d 57m 13.0s) | C | 60 | 18.5 | 16891 | 2024-07-31 19:01:13 | MASTER-SAAO | (00h 13m 16.09s , -50d 11m 26.5s) | C | 60 | 19.0 | 16971 | 2024-07-31 19:02:33 | MASTER-SAAO | (00h 25m 53.25s , -50d 11m 11.1s) | C | 60 | 19.1 | 17050 | 2024-07-31 19:03:52 | MASTER-SAAO | (00h 12m 43.15s , -48d 15m 48.8s) | C | 60 | 19.1 | 17130 | 2024-07-31 19:05:12 | MASTER-SAAO | (00h 24m 45.96s , -48d 16m 51.9s) | C | 60 | 19.1 | 17209 | 2024-07-31 19:06:31 | MASTER-SAAO | (00h 14m 01.74s , -52d 03m 54.4s) | C | 60 | 19.2 | 17289 | 2024-07-31 19:07:51 | MASTER-SAAO | (00h 26m 59.91s , -52d 04m 12.9s) | C | 60 | 19.2 | 17368 | 2024-07-31 19:09:10 | MASTER-SAAO | (00h 37m 09.28s , -50d 10m 04.1s) | C | 60 | 19.2 | 17447 | 2024-07-31 19:10:29 | MASTER-SAAO | (00h 49m 35.45s , -50d 10m 46.4s) | C | 60 | 18.8 | 17526 | 2024-07-31 19:11:48 | MASTER-SAAO | (00h 38m 50.06s , -52d 04m 47.2s) | C | 60 | 19.1 | 17606 | 2024-07-31 19:13:08 | MASTER-SAAO | (00h 51m 49.90s , -52d 02m 45.4s) | C | 60 | 19.0 | 17685 | 2024-07-31 19:14:27 | MASTER-SAAO | (00h 12m 09.83s , -46d 23m 31.4s) | C | 60 | 18.9 | 17764 | 2024-07-31 19:15:46 | MASTER-SAAO | (00h 23m 49.77s , -46d 21m 50.2s) | C | 60 | 18.9 | 17844 | 2024-07-31 19:17:06 | MASTER-SAAO | (00h 40m 34.95s , -53d 57m 59.1s) | C | 60 | 18.8 | 17923 | 2024-07-31 19:18:25 | MASTER-SAAO | (00h 54m 13.87s , -53d 56m 37.4s) | C | 60 | 18.9 | 18002 | 2024-07-31 19:19:44 | MASTER-SAAO | (00h 13m 21.42s , -50d 10m 48.1s) | C | 60 | 19.1 | 18082 | 2024-07-31 19:21:04 | MASTER-SAAO | (00h 25m 46.22s , -50d 11m 33.4s) | C | 60 | 19.3 | 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/36991. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...