{
  "bibcode": "2022GCN.31620....1B",
  "body": "O.Gress & N.M. Budnev (Irkutsk State University, API),\nV. Lipunov, N.Tiurina,  K.Zhirkov, A.Kuznetsov, P.Balanutsa, \nA.Chasovnikov, K.Zhirkov, N.Tiurina, G.Antipov, E.Gorbovskoy, D. Vlasenko, \nV.Senik, Ya.Kechin, V.Topolev\n(Lomonosov MSU,SAI,PhysicsDepartment),\nA. Gabovich & V.Yurkov (Blagoveschensk Educational StateUniversity)\nL. Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J. Martinez,\nA.R.Corella, L.H.Rodriguez (INAOE, OAGH),\nC.Francile, R. Podesta, F. Podesta (OAFA),\nR. Rebolo, M. Serra(The Instituto de Astrofisica de Canarias),\nD. Buckley (South African Astronomical Observatory),\nA. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory),\n\n\nMASTER Global Robotic Net (Lipunov et al. \n2010, Advances in Astronomy, v.2010, 30L) started IceCube \n20220220.60/AMON NuEm-220220A alert (GCN  #31615, \nhttps://gcn.gsfc.nasa.gov/other/icecube_220220A.gcn3 ) \noptical observations  25 sec after notice time (618s after trigger \ntime)\nat 2022-02-20 14:29:55 UT at MASTER-Amur (Lipunov et al. GCN #31616) and \nobserved it in MASTER-OAGH (Mexico), -SAAO (South Africa), -OAFA \n(Argentina), see cover map \nhttps://master.sai.msu.ru/site/master2/event.php?id=1889478 <br>\n\nThere is a blazar 5BZBJ1442+1200 (RA=220.70117d DEC=12.01119d) 1.5 degrees \nfrom the center of the event that shows moderate dimming that started 10 \ndays before the neutrino according to public ATLAS data \n(https://fallingstar-data.com/forcedphot/queue/169872/plot.pdf).<br>\n\nThere was IC-201014A in this region (IC GCN #28624, MASTER GCN #28627 ).\n\nDue to this dimming we are inclined to believe that  5BZBJ1442+1200 might \nbe a source of NuEM-220220A even though it is largely outside the \nerror-box.\n\nThe analysis will be continued.\nAdditional observations are planned.",
  "circularId": 31620,
  "createdOn": 1645438191000,
  "email": "lipunov@xray.sai.msu.ru",
  "subject": "IceCube Alert 220220.60:NuEm-220220A: MASTER optical possible counterpart",
  "submitter": "Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov@xray.sai.msu.ru>"
}