{
  "body": "K. 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-OAFA robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)\nstarted IceCube-241224A (IC GCN #38664, trigger No 303893, trigger time 07:10:04UT, 12h 20m 13.44s , +02d 46m 01.2s, R=0.74) errorbox\n16 sec after notice time (178 sec after trigger time) at 2024-12-24 07:13:02 UT, with upper limit up to  19.6 mag (Lipunov et al.GCN#38663, MASTER cover map:\nhttps://master.sai.msu.ru/site/master2/event.php?id=2720792 )\n\nWe observed it in MASTER-SAAO, MASTER-OAFA and analyzed MASTER archive images since 2016 of the sources, that can be related with this event.\nThere is  quasar PKS 1217+02  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=185.0495+2.0617222222222&-c.rs=5)\n\nWe detected its brightening up to 15.7m near alert time.\nMASTER archive light curve from 2016 year is available at\nhttp://observ.pereplet.ru/IC/MASTER_IC241224A.jpg\n\nWe report the 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",
  "subject": "IceCube-241224A: MASTER detection of PKS 1217+02 blazar flare with Zhirkov effect",
  "createdOn": 1741608077069,
  "submitter": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
  "submittedHow": "email",
  "eventId": "IceCube-241224A",
  "bibcode": "2025GCN.39651....1L",
  "circularId": 39651
}