{
  "bibcode": "2021GCN.29248....1L",
  "body": "V. Lipunov, V.Kornilov, E.Gorbovskoy, N.Tiurina,P.Balanutsa,F.Balakin, \nV.Vladimirov, A.Kuznetsov,K.Zhirkov,D. Vlasenko, I.Gorbunov, D.Zimnukhov, V.Senik,\nA.Chasovnikov,A.Pozdnyakov,V.Topolev, D.Cheryasov(Lomonosov Moscow State University, SAI, Physics Department),\nR. Podesta, C.Lopez, F. Podesta, C.Francile (Observatorio Astronomico FelixAguilar OAFA),\nR. Rebolo, M. Serra(The Instituto de Astrofisica de Canarias),\nD. Buckley (South African Astronomical Observatory),\nO.A. Gres, N.M. Budnev (Irkutsk State University, API),\nA. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory),\nA. Gabovich, V.Yurkov, Yu. Sergienko (Blagoveschensk Educational StateUniversity)\n\nMASTER-Tavrida robotic telescope\n(Global MASTER-Net http://observ.pereplet.ru, Lipunov et al. 2010, Advances in Astronomy,v.2010,30L)\nstarted (Lipunov et al. GCN 29239)\ninspect of Fermi and Swift GRB 210104A (Fermi GCN 29232, 29246;Ttrig=11:26:59;\nSwift GCN Troja et al. GCN 29233,Beardmore et al. GCN 29245, Breeveld et al. GCN 29247 ;\nBarthelmy https://gcn.gsfc.nasa.gov/other/210104A.gcn3 )\nat sunset at Lomonosov MSU Crimean observatory at 2021-01-04 15:19:29 UT.\n\nWe detect rebrightening of OT (discovered by Swift GCN 29233 and observed by Xin et al., GCN Circ. 29235; Hosokawa etal. GCN 29237; Kim et al. GCN 29238;\nLipunov et al. GCN 29239, Horiuchi et al. GCN 29241, Breeveld et al. GCN 29247)\nMASTER OT J065505.45+644035.0 at 2021-01-04 15:48:32UT with unfiltered \nm_OT=17.3.\n\nThe message may be cited.",
  "circularId": 29248,
  "createdOn": 1609800513000,
  "email": "lipunov@xray.sai.msu.ru",
  "subject": "GRB 210104A: MASTER OT rebrightening  detection",
  "submitter": "Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov@xray.sai.msu.ru>",
  "eventId": "GRB 210104A"
}