TITLE: GCN CIRCULAR NUMBER: 36782 SUBJECT: Fermi trigger No 741251380: Global MASTER-Net observations report DATE: 24/06/28 20:30:34 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 GRB240628.30 (trigger No 741251380,06h 59m 12.00s , +49d 25m 01.2s, R=34.82) errorbox 44676 sec after notice time and 44697 sec after trigger time at 2024-06-28 19:34:32 UT, with upper limit up to 16.4 mag. Observations started at twilight. The observations began at zenith distance = 82 deg. The sun altitude is -16.3 deg.

The galactic latitude b = 22 deg., longitude l = 168 deg.

Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2510977

We obtain a following upper limits.

Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________

44722 | 2024-06-28 19:34:32 | MASTER-Tavrida | (05h 35m 04.87s , +53d 00m 21.9s) | C | 50 | 15.9 | 44722 | 2024-06-28 19:34:32 | MASTER-Tavrida | (05h 34m 50.06s , +53d 04m 47.1s) | C | 50 | 16.4 | 44824 | 2024-06-28 19:36:04 | MASTER-Tavrida | (05h 35m 27.54s , +52d 46m 34.5s) | C | 70 | 16.4 | 44824 | 2024-06-28 19:36:04 | MASTER-Tavrida | (05h 35m 39.20s , +52d 42m 53.9s) | C | 70 | 16.0 | 44946 | 2024-06-28 19:37:56 | MASTER-Tavrida | (05h 35m 01.43s , +53d 00m 58.8s) | C | 90 | 15.9 | 44946 | 2024-06-28 19:37:56 | MASTER-Tavrida | (05h 34m 44.65s , +53d 05m 28.1s) | C | 90 | 16.3 | Filter C is a clear (unfiltred) band.

The observation and reduction will continue. The message may be cited.

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