TITLE: GCN CIRCULAR NUMBER: 36547 SUBJECT: Fermi GRB 240527B: Global MASTER-Net observations report DATE: 24/05/27 17:15:55 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 240527B ( Fermi GBM team, GCN 36546) errorbox 9266 sec after notice time and 9291 sec after trigger time at 2024-05-27 16:38:42 UT, with upper limit up to 19.4 mag. Observations started at twilight. The observations began at zenith distance = 33 deg. The sun altitude is -11.7 deg. The galactic latitude b = 16 deg., longitude l = 237 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2472451 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 9321 | 2024-05-27 16:38:42 | MASTER-SAAO | (08h 28m 27.08s , -12d 11m 25.9s) | C | 60 | 18.5 | 9401 | 2024-05-27 16:40:02 | MASTER-SAAO | (08h 36m 37.47s , -12d 10m 23.3s) | C | 60 | 18.6 | 10243 | 2024-05-27 16:54:04 | MASTER-SAAO | (08h 28m 28.80s , -12d 10m 06.2s) | C | 60 | 19.1 | 10323 | 2024-05-27 16:55:24 | MASTER-SAAO | (08h 36m 36.04s , -12d 10m 49.2s) | C | 60 | 19.3 | 10403 | 2024-05-27 16:56:44 | MASTER-SAAO | (08h 32m 25.70s , -14d 04m 43.2s) | C | 60 | 19.2 | 10483 | 2024-05-27 16:58:04 | MASTER-SAAO | (08h 40m 34.75s , -14d 05m 43.1s) | C | 60 | 19.2 | 10563 | 2024-05-27 16:59:24 | MASTER-SAAO | (08h 25m 05.25s , -10d 15m 57.2s) | C | 60 | 19.2 | 10642 | 2024-05-27 17:00:43 | MASTER-SAAO | (08h 33m 14.26s , -10d 17m 11.8s) | C | 60 | 19.3 | 10803 | 2024-05-27 17:03:24 | MASTER-SAAO | (08h 24m 52.36s , -14d 03m 20.3s) | C | 60 | 19.2 | 10883 | 2024-05-27 17:04:44 | MASTER-SAAO | (08h 43m 57.14s , -12d 11m 27.0s) | C | 60 | 19.3 | 11042 | 2024-05-27 17:07:23 | MASTER-SAAO | (08h 40m 33.16s , -10d 16m 51.0s) | C | 60 | 19.4 | 11202 | 2024-05-27 17:10:03 | MASTER-SAAO | (08h 28m 19.16s , -12d 10m 06.0s) | C | 60 | 19.3 | 11282 | 2024-05-27 17:11:23 | MASTER-SAAO | (08h 36m 32.47s , -12d 09m 07.5s) | C | 60 | 19.4 | 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/36547. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...