{
  "bibcode": "2021GCN.30173....1L",
  "body": "V. Lipunov, E. Gorbovskoy, V.Kornilov, D.Kuvshinov, N.Tyurina, P.Balanutsa,\nA.Kuznetsov, D. Vlasenko, F. Balakin\nLomonosov Moscow State University,\nSternberg Astronomical Institute, Moscow State University\n\nA. Tlatov, V.Senik, A.V. Parhomenko, D. Dormidontov\nKislovodsk Solar Station of the Pulkovo Observatory\n\nK. Ivanov, O. Gres, N.M. Budnev, S. Yazev, O. Chuvalaev, V. Poleshchuk\nIrkutsk State University\n\nV. Yurkov, A. Gabovich, Yu. Sergienko\nBlagoveschensk Educational State University, Blagoveschensk\n\nR. Podesta, Carlos Lopez and F. Podesta\nObservatorio Astronomico Felix Aguilar (OAFA)\n\nR. Rebolo, M. Serra, N. Lodieu, G. Israelian, L. Suarez-Andres\nThe Instituto de Astrofisica de Canarias\n\nD. Buckley, S. Potter, A. Kniazev, M. Kotze\nSouth African Astronomical Observatory\n\nMASTER-Kislovodsk robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) was pointed to the  GRB210610.83 145 sec after trigger time at 2021-06-10 19:53:52 UT. On our 3-th (130s exposure)  set , obtained 656 sec after tigger time at 2021-06-10 20:02:24 UT, we  found 1 optical transient within Swift error-box (ra=243.938 dec=14.3906 r=0.05) brighter than  17.7.\n\n\n T-Tmid      Date      Time       Expt.        Ra                Dec           Mag\n---------|---------------------|-------|-----------------|-----------------|-------\n     721   2021-06-10 20:02:24     130   (16h 15m 40.49s , +14d 23m 56.4s)     15.2\n\nThe 5-sigma upper limit has been about  17.7mag\nThe message may be cited.",
  "circularId": 30173,
  "createdOn": 1623357545000,
  "email": "lipunov@xray.sai.msu.ru",
  "subject": "Swift GRB210610.83: Global MASTER-Net OT detection",
  "submitter": "Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov@xray.sai.msu.ru>",
  "eventId": "GRB 210610.83"
}