{
  "circularId": 39614,
  "submitter": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
  "submittedHow": "email",
  "subject": "IceCube-241016A: MASTER flaring blazar 5BZU J073038.29-320820.2 with Zhirkov effect",
  "body": "\nK. Labzina,  K.Zhirkov, V.Lipunov, E.Gorbovskoy, A.Kuznetsov, G.Antipov, D.Vlasenko,\nA.Kuznetsov, N.Tyurina, P.Balanutsa, A.Chasovnikov, V.Topolev, Ya.Kechin, V.Senik, Yu.Tselik (Lomonosov MSU),\nO.Gress, N.Budnev, O.Ershova (ISU),\nC.Francile,  F. Podesta, R.Podesta, E. Gonzalez  (Observatorio Astronomico Felix Aguilar (OAFA),\nD.Buckley (SAAO),\nA.Sosnovskij (Crao RAS),\nA. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory),\nA. Gabovich, V.Yurkov (Blagoveschensk Educational StateUniversity),\nR.Rebolo (The Instituto de Astrofisica de Canarias),\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez,A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory)\n\nMASTER Global Robotic Net ( Lipunov et al., Advances in Astronomy, 2010, 30L )\nstarted IceCube-241016A alert (GCN#37794, trigger No 2910365,07h 29m 18.96s , -33d 31m 44.4s, R=0.87)\nerrorbox  69 sec after notice time (167 sec after trigger time) at 2024-10-16 01:01:19 UT\nwith upper limit up to  17.7 mag (Lipunov et al.GCN#37793)\n\nMASTER cover map:\nhttps://master.sai.msu.ru/site/master2/observ.php?id=2639656\n\nWe observed it in MASTER-SAAO and MASTER-OAFA and analyzed MASTER archive images since 2015 of the sources, that can be related with this event.\nWe detected variability of blazar 5BZU J073038.29-320820.2, located inside 3 sigma  IC error-box\nhttps://vizier.cds.unistra.fr/viz-bin/VizieR?-source=&-out.add=_r&-out.add=_RAJ%2C_DEJ&-sort=_r&-to=&-out.max=20&-meta.ucd=2&-meta.foot=1&-c=112.65954166667+-32.138944444444&-c.rs=5\n\nWe detected its brightening up to 16.0m at alert time at  MASTER archive light curve from 2015 year: http://observ.pereplet.ru/IC/MASTER_IC241016A.jpg\n\nLight curve also shows that a few days after neutrino alert this blazar returned to its original state.\n\nThis, we report observation of an Zhirkov effect, discovered earlier\n(The Astrophysic Jornal Letters, 896, L19, 2020 https://ui.adsabs.harvard.edu/abs/2020ApJ...896L..19L/abstract ).\n\n",
  "createdOn": 1741353578140,
  "eventId": "IceCube-241016A",
  "bibcode": "2025GCN.39614....1L"
}