{
  "subject": "IceCube-250309A: MASTER detection of J140105.33-091631.6 blazar flare with Zhirkov effect",
  "bibcode": "2025GCN.39713....1L",
  "eventId": "IceCube-250309A",
  "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 (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 AstrophysicsObservatory)\n\n\nMASTER-OAFA robotic telescope  (Global MASTER-Net: Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) \nlocated in Argentina (OAFA observatory of San Juan National University)\nstarted IceCube-250309A (IC GCN#39631) alert error-box (trigger No 1288692,14h 03m 12.24s , -10d 26m 24.0s, R=0.51)\n9 sec after notice time (109 sec after trigger time) at 2025-03-09 07:37:54 UT, with upper limit up to  21.3 mag. (Lipunov et al.GCN#39630)\n\nMASTER cover map:\nhttps://master.sai.msu.ru/site/master2/observ.php?id=2805613\n\nWe analyzed MASTER archive images since 2013 of possible sources, that can be related with this event.\nThere is blazar J140105.33-091631.6 inside 3 sigma https://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=210.27220833333+-9.2754444444444&-c.rs=5\nWe detected its decay and  brightening up to usual state after 10 hours of IC event trigger time.\n\nMASTER archive light curve from 2013 year is available at\n   http://observ.pereplet.ru/IC/MASTER_IC250309A.jpg\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 ).",
  "circularId": 39713,
  "submitter": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
  "createdOn": 1741919811658,
  "submittedHow": "email"
}