{
  "subject": "IceCube Alert 210515.01: Global MASTER-Net observations report",
  "bibcode": "2021GCN.30044....1L",
  "createdOn": 1621294788000,
  "circularId": 30044,
  "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, 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\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-OAFA robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Argentina (OAFA observatory of San Juan National University) was pointed to the IceCube Alert 210515.01 (trigger No 210514180925,06h 15m 43.20s , +12d 30m 36.0s, R=0.4) errorbox  2 days 47408 sec after notice time and 2 days 82706 sec after trigger time at 2021-05-17 23:17:53 UT, with upper limit up to  15.9 mag. The observations began at zenith distance = 75 deg. The sun  altitude  is -19.6 deg. \n\nThe galactic latitude b = -1 deg., longitude l = 198 deg.\n\n\nReal time updated cover map and OT discovered available here: \nhttps://master.sai.msu.ru/site/master2/observ.php?id=1613516\n\nWe obtain a following upper limits.  \n\nTmid-T0  |      Date Time      |          Site       |             Coord (J2000)          |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n  255536 | 2021-05-17 23:17:53 |         MASTER-OAFA | (06h 08m 18.87s , +11d 53m 26.4s) |   C |    60 | 15.1 |        \n  255616 | 2021-05-17 23:19:12 |         MASTER-OAFA | (06h 16m 33.89s , +11d 55m 22.7s) |   C |    60 | 15.9 |        \nFilter C is a clear (unfiltred) band. \n\n\nThe observation and reduction will continue. \nThe message may be cited."
}