{
  "subject": "GRB190324A: MASTER OT observations",
  "eventId": "GRB 190324A",
  "bibcode": "2019GCN.24003....1L",
  "createdOn": 1553497273000,
  "circularId": 24003,
  "submitter": "Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov@xray.sai.msu.ru>",
  "email": "lipunov@xray.sai.msu.ru",
  "body": "V. Lipunov, E. Gorbovskoy, N.Tyurina, V.Kornilov, D.Vlasenko, V.Vladimirov, D.Zimnukhov,\nA.Kuznetsov, P.Balanutsa, A. Chasovnikov, V.Topolev, D.Kuvshinov (Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C. Lopez, C.Francile, F. Podesta (Observatorio Astronomico Felix Aguilar OAFA, San Juan National University),\n\nH.Levato (Instituto de Ciencias Astronomicas, de la Tierra y del Espacio ICATE, SJNU)\n\nR. Rebolo, M. Serra, N. Lodieu, G. Israelian, L. Suarez-Andres (The Instituto de Astrofisica de Canarias),\n\nD. Buckley (South African Astronomical Observatory),\n\nO. Gress, N.M. Budnev, O.Ershova, Yu.Ishmuhametova, S.Yazev (Applied Physics Institute, Irkutsk State University),\n\nV. Yurkov, A. Gabovich, Yu. Sergienko, D. Kobcev (Blagoveschensk Educational State University),\n\nA. Tlatov, V.Senik, A.V. Parhomenko, D. Dormidontov (Kislovodsk Solar  Station of the Pulkovo Observatory),\n\nMASTER-OAFA robotic telescope  (Global MASTER-Net http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy,vol. 2010, 30L)\nlocated in Argentina (OAFA observatory of San JuanNational University)\nwas pointed to the GRB190324A (LaPorte et al. GCN 23993, Kunzweiler et al. GCN 23994, Perri et al. GCN 23997, Beardmore et al. GCN 24001, Hui  et al. GCN 24002)\n17 sec after notice time and 252 sec after trigger time at 2019-03-24 22:48:14 UT (Lipunov et al., GCN23995).\n\nThe  SunAltitude was  -1.09, so the GRB optical counterpart (MASTER OT J031827.61-471252.6 +-0.7arcsec)\nlight curve started at 2019-03-24  23:26:22UT (2541 sec after trigger time)\nwith m_OT=17.6 +-0.2(preliminary automatic light curve).\n\nThe OT became brighter (17.0) and  then shows classical decay.\n\nThis OT was also detected by Swift (Marshall et al. GCN 23996), and the spectra was observed by Perley et al. GCN23999).\n\nMASTER-SAAO was pointed 12s after notice time, but the alert altitude was -0.6deg.\n\nReduction will be continued.\nThe message may be cited."
}