TITLE: GCN CIRCULAR NUMBER: 35450 SUBJECT: Swift GRB240101.85: Global MASTER-Net observations report DATE: 24/01/01 22:12:46 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) was pointed to the Swift GRB240101.85 (trigger No 1205744,23h 28m 12.48s , +51d 38m 42.0s, R=0.05) errorbox 2999 sec after notice time and 3077 sec after trigger time at 2024-01-01 21:16:57 UT, with upper limit up to 16.5 mag. The observations began at zenith distance = 63 deg. The sun altitude is -68.2 deg.

The galactic latitude b = -9 deg., longitude l = 110 deg.

Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2348073

We obtain a following upper limits.

Tmid-T0 | Site |Filt.| Expt. | Limit| Comment _________|_____________________|_____|_______|______|________

3168 | MASTER-Tavrida | C | 180 | 14.8 | 5973 | MASTER-Tavrida | C | 180 | 16.5 | Filter C is a clear (unfiltred) band.

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

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