{
  "bibcode": "2019GCN.23851....1L",
  "body": "V. Lipunov, E. Gorbovskoy, N.Tyurina, V.Kornilov, D.Vlasenko, V.Vladimirov, \nD.Zimnukhov, A.Kuznetsov, P.Balanutsa, A. Chasovnikov, D.Kuvshinov (Lomonosov \nMoscow State University, SAI, Physics Department),\n\nR. Rebolo, M. Serra, N. Lodieu, G. Israelian, L. Suarez-Andres (The Instituto \nde Astrofisica de Canarias),\n\nD. Buckley (South African Astronomical Observatory),\n\nV. Yurkov, A. Gabovich, Yu. Sergienko, D. Kobcev (Blagoveschensk Educational \nState University),\n\nA. Tlatov, V.Senik, A.V. Parhomenko, D. Dormidontov (Kislovodsk Solar Station \nof the Pulkovo Observatory),\n\nO. Gress, N.M. Budnev, O.Ershova, Yu.Ishmuhametova (Applied Physics Institute, \nIrkutsk State University),\n\nR. Podesta, C. Lopez, C.Francile, F. Podesta (Observatorio Astronomico Felix \nAguilar OAFA),\n\nH.Levato (Instituto de Ciencias Astronomicas, de la Tierra y del Espacio ICATE)\n\nMASTER-SAAO robotic telescope (Global MASTER-Net http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, v.2010, 30L)\nwas pointed to Swift Trigger 887541  (Barthelmy  et al. GCN23849,Ttrig=2019-02-03 21:18:17UT)\n~3h after trigger time (at alert time error-box was under the horizon at all MASTER observatories)\nat  2019-02-04 00:16:44UT.\n\nThere is no OT inside Swift-XRT error-box with unfiltered mlim=17.5 \n(5sigma, 180s exposition)\n\nThe observations started when error-box altitude was 9 deg.\nThe sun altitude was -38deg.\nThe message may be cited.",
  "circularId": 23851,
  "createdOn": 1549240781000,
  "email": "lipunov@xray.sai.msu.ru",
  "subject": "Swift Trigger 887541: MASTER optical observation",
  "submitter": "Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov@xray.sai.msu.ru>"
}