{
  "bibcode": "2017GCN.22273....1T",
  "body": "N.Tyurina, V. Lipunov, E. Gorbovskoy,V.Kornilov, D.Kuvshinov, A.V.Krylov, \nI.Gorbunov, P.Balanutsa, A.Kuznetsov, V.V.Chazov, D. Vlasenko\nLomonosov Moscow State University, Sternberg Astronomical Institut of MSU\n\nR.Podesta, C.Lopez, F. Podesta Observatorio Astronomico Felix Aguilar (OAFA),\nNational University of San Juan, Argentina\n\nH. Levato, C. Saffe\nInstituto de Ciencias Astronomicas,de la Tierra y del Espacio (ICATE),\nSan Juan, Argentina\n\nD.Buckley, S. Potter, A.Kniazev, M.Kotze\nSouth African Astronomical Observatory\n\nR. Rebolo, M. Serra, N. Lodieu, G. Israelian, L. Suarez-Andres\nThe Instituto de Astrofisica de Canarias\n\nO.Gres, K.Ivanov, S.Yazev, N.M.Budnev, O.Gres, O.Chuvalaev, V.A.Poleshchuk,\nIrkutsk State University\n\nV.Yurkov, Yu.Sergienko\nBlagoveschensk Educational State University, Blagoveschensk\n\nA. Tlatov, V.Senik, A.V. Parhomenko, D. Dormidontov\nKislovodsk Solar Station of the Pulkovo Observatory\n\n\nMASTER-IAC  robotic telescope (MASTER-Net: http://observ.pereplet.ru) \nlocated in IAC (Tenerife) was pointed to the Swift  GRB171222A (Racusin et \nal.,  GCN  #22265;) 47159 seconds (~ 13h ) \nafter trigger time at 2017-12-23  05:31:03 UT.\nThe 5-sigma upper limit has been about 19.3  at single (180 s) and 20.9 at \ncoadd (10x180 = 1800 s ) images.\n\nWe see OT detected by (Perley et al., GCN #22269; de Ugarte Postigo et \nal., GCN #22272 ) at X-ray position (Osborne et al.,  GCN #22266; D'Elia \net al., GCN #22271).\n\nThe OT unfiltered magnitude is about ~ 21.\n\nThe observations made on zenit distance = 11 degrees, galaxy latitude b = \n52 degree.\nThe moon (21 % bright part) below the horizon (The altitude of the Moon is \n-73 degree ).\nThe sun  altitude  is -30.5 degree.\nThe object can be observed till sunrise at 2017-12-23 07:54:43 .\n\nThis message can be cited.",
  "circularId": 22273,
  "createdOn": 1514028415000,
  "email": "lipunov@xray.sai.msu.ru",
  "subject": "GRB 171222A: MASTER-Net OT observations",
  "submitter": "Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov@xray.sai.msu.ru>",
  "eventId": "GRB 171222A"
}