TITLE: GCN CIRCULAR NUMBER: 39913 SUBJECT: GRB 250327B: MASTER detection of OT rebrightening DATE: 25/03/28 20:43:27 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs lipunov@xray.sai.msu.ru
A.Tarasenkov, V.Lipunov, A.Kuznetsov, G.Antipov, K..Zhirkov, P.Balanutsa, N.Tyurina, E.Gorbovskoy, Ya.Kechin, A.Chasovnikov, V.Topolev, V.Senik, K.Labzina (Lomonosov MSU), C.Francile, F. Podesta, R.Podesta, E. Gonzalez (Observatorio Astronomico Felix Aguilar (OAFA), D.Buckley (SAAO), A.Sosnovskij (Crao RAS), O.Gress, N.Budnev, O.Ershova (ISU), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), A. Gabovich, V.Yurkov (Blagoveschensk Educational StateUniversity), R.Rebolo (The Instituto de Astrofisica de Canarias), L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino,J.Martinez,A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory)
MASTER-OAFA robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Argentina, started SVOM GRB 250327B (Bouchet et al. GCN 39888, Ttrigger=2025-03-27T21:11:27UT) at 2025-03-28 06:46:31UT with mlim=21m at 600s summary exposition.
There is optical source with m_OT=19.9 +-0.3m(by GAIA reference stars) at two single images and at summary one at Moskvitin et al. (GCN 39889) position (also observed by SVOM/VT (GCN 39890), GOTO (GCN 398901), NOT (39893), Mephisto (GCN 39894), LCOGT (GCN 39896, GCN 39912, GCN 39904), COLIBRI (GCN 39897), LT (GCN 39902), OHP (GCN 39905), CrAO/SAORAS (GCN 39906)). that means rebrightening 9.5h after trigger time
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