{
  "bibcode": "2020GCN.27614....1L",
  "body": "V. Lipunov, E. Gorbovskoy, V.Kornilov, N.Tyurina, P.Balanutsa, A.Kuznetsov, F.Balakin, \nV.Vladimirov, D. Vlasenko, I.Gorbunov, D.Zimnukhov, V.Senik, T.Pogrosheva,\nD.Kuvshinov,  D. Cheryasov\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile \n(Observatorio Astronomico Felix Aguilar OAFA),\n\nH.Levato \n(Instituto de Ciencias Astronomicas, de la Tierra y del Espacio ICATE),\n\nR. Rebolo, M. Serra \n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley \n(South African Astronomical Observatory),\n\nO.A. Gres, N.M. Budnev, O.Ershova \n(Irkutsk State University, API),\n\nA. Tlatov, D. Dormidontov \n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nV. Yurkov, A. Gabovich, Yu. Sergienko \n(Blagoveschensk Educational State University)\n\n\n\n\nMASTER-Tunka robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Russia (Applied Physics Institute, Irkutsk State University) was pointed to the IceCube Alert 200421.02 (trigger No 60770138,05h 57m 01.20s , +07d 54m 25.2s, R=0.61) errorbox  45894 sec after notice time and 45943 sec after trigger time at 2020-04-21 13:21:07 UT, with upper limit up to  15.6 mag. Observations started at twilight.  The observations began at zenith distance = 68 deg. The sun  altitude  is -10.4 deg. \n\nThe galactic latitude b = -8 deg., longitude l = 200 deg.\n\n\nReal time updated cover map and OT discovered available here: \nhttps://master.sai.msu.ru/site/master2/observ.php?id=1341229\n\nWe obtain a following upper limits.  \n\nTmid-T0  |      Date Time      |          Site       |             Coord (J2000)          |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n   45973 | 2020-04-21 13:21:07 |        MASTER-Tunka | (05h 51m 49.84s , +08d 17m 27.8s) |   C |    60 | 15.3 |        \n   46053 | 2020-04-21 13:22:27 |        MASTER-Tunka | (05h 59m 58.32s , +08d 19m 28.6s) |   C |    60 | 15.6 |        \nFilter C is a clear (unfiltred) band. \n\n\nThe observation and reduction will continue. \nThe message may be cited.",
  "circularId": 27614,
  "createdOn": 1587476350000,
  "email": "lipunov@xray.sai.msu.ru",
  "subject": "IceCube Alert 200421.02: Global MASTER-Net observations report",
  "submitter": "Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov@xray.sai.msu.ru>"
}